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android_frameworks_base/libs/hwui/OpenGLRenderer.cpp
Chris Craik d15321bbf5 Use the same interrupt/resume logic for all functor calls 
bug:7093396

The functor was able to change the renderer's blend mode without it
being restored in process mode. This single path of updating gl caches
reduces likelihood of this occurring in the future.

Change-Id: Ie367532f9c683299f02bc4f635d7cb31f96db39f
2012-11-28 14:45:04 -08:00

3180 lines
109 KiB
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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "OpenGLRenderer"
#include <stdlib.h>
#include <stdint.h>
#include <sys/types.h>
#include <SkCanvas.h>
#include <SkPathMeasure.h>
#include <SkTypeface.h>
#include <utils/Log.h>
#include <utils/StopWatch.h>
#include <private/hwui/DrawGlInfo.h>
#include <ui/Rect.h>
#include "OpenGLRenderer.h"
#include "DisplayListRenderer.h"
#include "PathRenderer.h"
#include "Properties.h"
#include "Vector.h"
namespace android {
namespace uirenderer {
///////////////////////////////////////////////////////////////////////////////
// Defines
///////////////////////////////////////////////////////////////////////////////
#define RAD_TO_DEG (180.0f / 3.14159265f)
#define MIN_ANGLE 0.001f
#define ALPHA_THRESHOLD 0
#define FILTER(paint) (!paint || paint->isFilterBitmap() ? GL_LINEAR : GL_NEAREST)
///////////////////////////////////////////////////////////////////////////////
// Globals
///////////////////////////////////////////////////////////////////////////////
/**
* Structure mapping Skia xfermodes to OpenGL blending factors.
*/
struct Blender {
SkXfermode::Mode mode;
GLenum src;
GLenum dst;
}; // struct Blender
// In this array, the index of each Blender equals the value of the first
// entry. For instance, gBlends[1] == gBlends[SkXfermode::kSrc_Mode]
static const Blender gBlends[] = {
{ SkXfermode::kClear_Mode, GL_ZERO, GL_ONE_MINUS_SRC_ALPHA },
{ SkXfermode::kSrc_Mode, GL_ONE, GL_ZERO },
{ SkXfermode::kDst_Mode, GL_ZERO, GL_ONE },
{ SkXfermode::kSrcOver_Mode, GL_ONE, GL_ONE_MINUS_SRC_ALPHA },
{ SkXfermode::kDstOver_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ONE },
{ SkXfermode::kSrcIn_Mode, GL_DST_ALPHA, GL_ZERO },
{ SkXfermode::kDstIn_Mode, GL_ZERO, GL_SRC_ALPHA },
{ SkXfermode::kSrcOut_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ZERO },
{ SkXfermode::kDstOut_Mode, GL_ZERO, GL_ONE_MINUS_SRC_ALPHA },
{ SkXfermode::kSrcATop_Mode, GL_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA },
{ SkXfermode::kDstATop_Mode, GL_ONE_MINUS_DST_ALPHA, GL_SRC_ALPHA },
{ SkXfermode::kXor_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA },
{ SkXfermode::kPlus_Mode, GL_ONE, GL_ONE },
{ SkXfermode::kMultiply_Mode, GL_ZERO, GL_SRC_COLOR },
{ SkXfermode::kScreen_Mode, GL_ONE, GL_ONE_MINUS_SRC_COLOR }
};
// This array contains the swapped version of each SkXfermode. For instance
// this array's SrcOver blending mode is actually DstOver. You can refer to
// createLayer() for more information on the purpose of this array.
static const Blender gBlendsSwap[] = {
{ SkXfermode::kClear_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ZERO },
{ SkXfermode::kSrc_Mode, GL_ZERO, GL_ONE },
{ SkXfermode::kDst_Mode, GL_ONE, GL_ZERO },
{ SkXfermode::kSrcOver_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ONE },
{ SkXfermode::kDstOver_Mode, GL_ONE, GL_ONE_MINUS_SRC_ALPHA },
{ SkXfermode::kSrcIn_Mode, GL_ZERO, GL_SRC_ALPHA },
{ SkXfermode::kDstIn_Mode, GL_DST_ALPHA, GL_ZERO },
{ SkXfermode::kSrcOut_Mode, GL_ZERO, GL_ONE_MINUS_SRC_ALPHA },
{ SkXfermode::kDstOut_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ZERO },
{ SkXfermode::kSrcATop_Mode, GL_ONE_MINUS_DST_ALPHA, GL_SRC_ALPHA },
{ SkXfermode::kDstATop_Mode, GL_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA },
{ SkXfermode::kXor_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA },
{ SkXfermode::kPlus_Mode, GL_ONE, GL_ONE },
{ SkXfermode::kMultiply_Mode, GL_DST_COLOR, GL_ZERO },
{ SkXfermode::kScreen_Mode, GL_ONE_MINUS_DST_COLOR, GL_ONE }
};
///////////////////////////////////////////////////////////////////////////////
// Constructors/destructor
///////////////////////////////////////////////////////////////////////////////
OpenGLRenderer::OpenGLRenderer(): mCaches(Caches::getInstance()) {
mShader = NULL;
mColorFilter = NULL;
mHasShadow = false;
mHasDrawFilter = false;
memcpy(mMeshVertices, gMeshVertices, sizeof(gMeshVertices));
mFirstSnapshot = new Snapshot;
mScissorOptimizationDisabled = false;
}
OpenGLRenderer::~OpenGLRenderer() {
// The context has already been destroyed at this point, do not call
// GL APIs. All GL state should be kept in Caches.h
}
void OpenGLRenderer::initProperties() {
char property[PROPERTY_VALUE_MAX];
if (property_get(PROPERTY_DISABLE_SCISSOR_OPTIMIZATION, property, "false")) {
mScissorOptimizationDisabled = !strcasecmp(property, "true");
INIT_LOGD(" Scissor optimization %s",
mScissorOptimizationDisabled ? "disabled" : "enabled");
} else {
INIT_LOGD(" Scissor optimization enabled");
}
}
///////////////////////////////////////////////////////////////////////////////
// Setup
///////////////////////////////////////////////////////////////////////////////
bool OpenGLRenderer::isDeferred() {
return false;
}
void OpenGLRenderer::setViewport(int width, int height) {
initViewport(width, height);
glDisable(GL_DITHER);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glEnableVertexAttribArray(Program::kBindingPosition);
}
void OpenGLRenderer::initViewport(int width, int height) {
mOrthoMatrix.loadOrtho(0, width, height, 0, -1, 1);
mWidth = width;
mHeight = height;
mFirstSnapshot->height = height;
mFirstSnapshot->viewport.set(0, 0, width, height);
}
status_t OpenGLRenderer::prepare(bool opaque) {
return prepareDirty(0.0f, 0.0f, mWidth, mHeight, opaque);
}
status_t OpenGLRenderer::prepareDirty(float left, float top, float right, float bottom,
bool opaque) {
mCaches.clearGarbage();
mSnapshot = new Snapshot(mFirstSnapshot,
SkCanvas::kMatrix_SaveFlag | SkCanvas::kClip_SaveFlag);
mSnapshot->fbo = getTargetFbo();
mSaveCount = 1;
mSnapshot->setClip(left, top, right, bottom);
mDirtyClip = true;
updateLayers();
// If we know that we are going to redraw the entire framebuffer,
// perform a discard to let the driver know we don't need to preserve
// the back buffer for this frame.
if (mCaches.extensions.hasDiscardFramebuffer() &&
left <= 0.0f && top <= 0.0f && right >= mWidth && bottom >= mHeight) {
const GLenum attachments[] = { getTargetFbo() == 0 ? GL_COLOR_EXT : GL_COLOR_ATTACHMENT0 };
glDiscardFramebufferEXT(GL_FRAMEBUFFER, 1, attachments);
}
syncState();
// Functors break the tiling extension in pretty spectacular ways
// This ensures we don't use tiling when a functor is going to be
// invoked during the frame
mSuppressTiling = mCaches.hasRegisteredFunctors();
mTilingSnapshot = mSnapshot;
startTiling(mTilingSnapshot, true);
debugOverdraw(true, true);
return clear(left, top, right, bottom, opaque);
}
status_t OpenGLRenderer::clear(float left, float top, float right, float bottom, bool opaque) {
if (!opaque) {
mCaches.enableScissor();
mCaches.setScissor(left, mSnapshot->height - bottom, right - left, bottom - top);
glClear(GL_COLOR_BUFFER_BIT);
return DrawGlInfo::kStatusDrew;
}
mCaches.resetScissor();
return DrawGlInfo::kStatusDone;
}
void OpenGLRenderer::syncState() {
glViewport(0, 0, mWidth, mHeight);
if (mCaches.blend) {
glEnable(GL_BLEND);
} else {
glDisable(GL_BLEND);
}
}
void OpenGLRenderer::startTiling(const sp<Snapshot>& s, bool opaque) {
if (!mSuppressTiling) {
Rect* clip = mTilingSnapshot->clipRect;
if (s->flags & Snapshot::kFlagIsFboLayer) {
clip = s->clipRect;
}
mCaches.startTiling(clip->left, s->height - clip->bottom,
clip->right - clip->left, clip->bottom - clip->top, opaque);
}
}
void OpenGLRenderer::endTiling() {
if (!mSuppressTiling) mCaches.endTiling();
}
void OpenGLRenderer::finish() {
renderOverdraw();
endTiling();
if (!suppressErrorChecks()) {
#if DEBUG_OPENGL
GLenum status = GL_NO_ERROR;
while ((status = glGetError()) != GL_NO_ERROR) {
ALOGD("GL error from OpenGLRenderer: 0x%x", status);
switch (status) {
case GL_INVALID_ENUM:
ALOGE(" GL_INVALID_ENUM");
break;
case GL_INVALID_VALUE:
ALOGE(" GL_INVALID_VALUE");
break;
case GL_INVALID_OPERATION:
ALOGE(" GL_INVALID_OPERATION");
break;
case GL_OUT_OF_MEMORY:
ALOGE(" Out of memory!");
break;
}
}
#endif
#if DEBUG_MEMORY_USAGE
mCaches.dumpMemoryUsage();
#else
if (mCaches.getDebugLevel() & kDebugMemory) {
mCaches.dumpMemoryUsage();
}
#endif
}
}
void OpenGLRenderer::interrupt() {
if (mCaches.currentProgram) {
if (mCaches.currentProgram->isInUse()) {
mCaches.currentProgram->remove();
mCaches.currentProgram = NULL;
}
}
mCaches.unbindMeshBuffer();
mCaches.unbindIndicesBuffer();
mCaches.resetVertexPointers();
mCaches.disbaleTexCoordsVertexArray();
debugOverdraw(false, false);
}
void OpenGLRenderer::resume() {
sp<Snapshot> snapshot = (mSnapshot != NULL) ? mSnapshot : mFirstSnapshot;
glViewport(0, 0, snapshot->viewport.getWidth(), snapshot->viewport.getHeight());
glBindFramebuffer(GL_FRAMEBUFFER, snapshot->fbo);
debugOverdraw(true, false);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
mCaches.scissorEnabled = glIsEnabled(GL_SCISSOR_TEST);
mCaches.enableScissor();
mCaches.resetScissor();
dirtyClip();
mCaches.activeTexture(0);
mCaches.blend = true;
glEnable(GL_BLEND);
glBlendFunc(mCaches.lastSrcMode, mCaches.lastDstMode);
glBlendEquation(GL_FUNC_ADD);
}
void OpenGLRenderer::resumeAfterLayer() {
sp<Snapshot> snapshot = (mSnapshot != NULL) ? mSnapshot : mFirstSnapshot;
glViewport(0, 0, snapshot->viewport.getWidth(), snapshot->viewport.getHeight());
glBindFramebuffer(GL_FRAMEBUFFER, snapshot->fbo);
debugOverdraw(true, false);
mCaches.resetScissor();
dirtyClip();
}
void OpenGLRenderer::detachFunctor(Functor* functor) {
mFunctors.remove(functor);
}
void OpenGLRenderer::attachFunctor(Functor* functor) {
mFunctors.add(functor);
}
status_t OpenGLRenderer::invokeFunctors(Rect& dirty) {
status_t result = DrawGlInfo::kStatusDone;
size_t count = mFunctors.size();
if (count > 0) {
interrupt();
SortedVector<Functor*> functors(mFunctors);
mFunctors.clear();
DrawGlInfo info;
info.clipLeft = 0;
info.clipTop = 0;
info.clipRight = 0;
info.clipBottom = 0;
info.isLayer = false;
info.width = 0;
info.height = 0;
memset(info.transform, 0, sizeof(float) * 16);
for (size_t i = 0; i < count; i++) {
Functor* f = functors.itemAt(i);
result |= (*f)(DrawGlInfo::kModeProcess, &info);
if (result & DrawGlInfo::kStatusDraw) {
Rect localDirty(info.dirtyLeft, info.dirtyTop, info.dirtyRight, info.dirtyBottom);
dirty.unionWith(localDirty);
}
if (result & DrawGlInfo::kStatusInvoke) {
mFunctors.add(f);
}
}
resume();
}
return result;
}
status_t OpenGLRenderer::callDrawGLFunction(Functor* functor, Rect& dirty) {
interrupt();
detachFunctor(functor);
mCaches.enableScissor();
if (mDirtyClip) {
setScissorFromClip();
}
Rect clip(*mSnapshot->clipRect);
clip.snapToPixelBoundaries();
// Since we don't know what the functor will draw, let's dirty
// tne entire clip region
if (hasLayer()) {
dirtyLayerUnchecked(clip, getRegion());
}
DrawGlInfo info;
info.clipLeft = clip.left;
info.clipTop = clip.top;
info.clipRight = clip.right;
info.clipBottom = clip.bottom;
info.isLayer = hasLayer();
info.width = getSnapshot()->viewport.getWidth();
info.height = getSnapshot()->height;
getSnapshot()->transform->copyTo(&info.transform[0]);
status_t result = (*functor)(DrawGlInfo::kModeDraw, &info) | DrawGlInfo::kStatusDrew;
if (result != DrawGlInfo::kStatusDone) {
Rect localDirty(info.dirtyLeft, info.dirtyTop, info.dirtyRight, info.dirtyBottom);
dirty.unionWith(localDirty);
if (result & DrawGlInfo::kStatusInvoke) {
mFunctors.add(functor);
}
}
resume();
return result;
}
///////////////////////////////////////////////////////////////////////////////
// Debug
///////////////////////////////////////////////////////////////////////////////
void OpenGLRenderer::startMark(const char* name) const {
mCaches.startMark(0, name);
}
void OpenGLRenderer::endMark() const {
mCaches.endMark();
}
void OpenGLRenderer::debugOverdraw(bool enable, bool clear) {
if (mCaches.debugOverdraw && getTargetFbo() == 0) {
if (clear) {
mCaches.disableScissor();
mCaches.stencil.clear();
}
if (enable) {
mCaches.stencil.enableDebugWrite();
} else {
mCaches.stencil.disable();
}
}
}
void OpenGLRenderer::renderOverdraw() {
if (mCaches.debugOverdraw && getTargetFbo() == 0) {
const Rect* clip = mTilingSnapshot->clipRect;
mCaches.enableScissor();
mCaches.setScissor(clip->left, mTilingSnapshot->height - clip->bottom,
clip->right - clip->left, clip->bottom - clip->top);
mCaches.stencil.enableDebugTest(2);
drawColor(0x2f0000ff, SkXfermode::kSrcOver_Mode);
mCaches.stencil.enableDebugTest(3);
drawColor(0x2f00ff00, SkXfermode::kSrcOver_Mode);
mCaches.stencil.enableDebugTest(4);
drawColor(0x3fff0000, SkXfermode::kSrcOver_Mode);
mCaches.stencil.enableDebugTest(4, true);
drawColor(0x7fff0000, SkXfermode::kSrcOver_Mode);
mCaches.stencil.disable();
}
}
///////////////////////////////////////////////////////////////////////////////
// Layers
///////////////////////////////////////////////////////////////////////////////
bool OpenGLRenderer::updateLayer(Layer* layer, bool inFrame) {
if (layer->deferredUpdateScheduled && layer->renderer && layer->displayList) {
OpenGLRenderer* renderer = layer->renderer;
Rect& dirty = layer->dirtyRect;
if (inFrame) {
endTiling();
debugOverdraw(false, false);
}
renderer->setViewport(layer->layer.getWidth(), layer->layer.getHeight());
renderer->prepareDirty(dirty.left, dirty.top, dirty.right, dirty.bottom, !layer->isBlend());
renderer->drawDisplayList(layer->displayList, dirty, DisplayList::kReplayFlag_ClipChildren);
renderer->finish();
if (inFrame) {
resumeAfterLayer();
startTiling(mSnapshot);
}
dirty.setEmpty();
layer->deferredUpdateScheduled = false;
layer->renderer = NULL;
layer->displayList = NULL;
return true;
}
return false;
}
void OpenGLRenderer::updateLayers() {
int count = mLayerUpdates.size();
if (count > 0) {
startMark("Layer Updates");
// Note: it is very important to update the layers in reverse order
for (int i = count - 1; i >= 0; i--) {
Layer* layer = mLayerUpdates.itemAt(i);
updateLayer(layer, false);
mCaches.resourceCache.decrementRefcount(layer);
}
mLayerUpdates.clear();
glBindFramebuffer(GL_FRAMEBUFFER, getTargetFbo());
endMark();
}
}
void OpenGLRenderer::pushLayerUpdate(Layer* layer) {
if (layer) {
mLayerUpdates.push_back(layer);
mCaches.resourceCache.incrementRefcount(layer);
}
}
void OpenGLRenderer::clearLayerUpdates() {
size_t count = mLayerUpdates.size();
if (count > 0) {
mCaches.resourceCache.lock();
for (size_t i = 0; i < count; i++) {
mCaches.resourceCache.decrementRefcountLocked(mLayerUpdates.itemAt(i));
}
mCaches.resourceCache.unlock();
mLayerUpdates.clear();
}
}
///////////////////////////////////////////////////////////////////////////////
// State management
///////////////////////////////////////////////////////////////////////////////
int OpenGLRenderer::getSaveCount() const {
return mSaveCount;
}
int OpenGLRenderer::save(int flags) {
return saveSnapshot(flags);
}
void OpenGLRenderer::restore() {
if (mSaveCount > 1) {
restoreSnapshot();
}
}
void OpenGLRenderer::restoreToCount(int saveCount) {
if (saveCount < 1) saveCount = 1;
while (mSaveCount > saveCount) {
restoreSnapshot();
}
}
int OpenGLRenderer::saveSnapshot(int flags) {
mSnapshot = new Snapshot(mSnapshot, flags);
return mSaveCount++;
}
bool OpenGLRenderer::restoreSnapshot() {
bool restoreClip = mSnapshot->flags & Snapshot::kFlagClipSet;
bool restoreLayer = mSnapshot->flags & Snapshot::kFlagIsLayer;
bool restoreOrtho = mSnapshot->flags & Snapshot::kFlagDirtyOrtho;
sp<Snapshot> current = mSnapshot;
sp<Snapshot> previous = mSnapshot->previous;
if (restoreOrtho) {
Rect& r = previous->viewport;
glViewport(r.left, r.top, r.right, r.bottom);
mOrthoMatrix.load(current->orthoMatrix);
}
mSaveCount--;
mSnapshot = previous;
if (restoreClip) {
dirtyClip();
}
if (restoreLayer) {
composeLayer(current, previous);
}
return restoreClip;
}
///////////////////////////////////////////////////////////////////////////////
// Layers
///////////////////////////////////////////////////////////////////////////////
int OpenGLRenderer::saveLayer(float left, float top, float right, float bottom,
SkPaint* p, int flags) {
const GLuint previousFbo = mSnapshot->fbo;
const int count = saveSnapshot(flags);
if (!mSnapshot->isIgnored()) {
int alpha = 255;
SkXfermode::Mode mode;
if (p) {
alpha = p->getAlpha();
mode = getXfermode(p->getXfermode());
} else {
mode = SkXfermode::kSrcOver_Mode;
}
createLayer(left, top, right, bottom, alpha, mode, flags, previousFbo);
}
return count;
}
int OpenGLRenderer::saveLayerAlpha(float left, float top, float right, float bottom,
int alpha, int flags) {
if (alpha >= 255) {
return saveLayer(left, top, right, bottom, NULL, flags);
} else {
SkPaint paint;
paint.setAlpha(alpha);
return saveLayer(left, top, right, bottom, &paint, flags);
}
}
/**
* Layers are viewed by Skia are slightly different than layers in image editing
* programs (for instance.) When a layer is created, previously created layers
* and the frame buffer still receive every drawing command. For instance, if a
* layer is created and a shape intersecting the bounds of the layers and the
* framebuffer is draw, the shape will be drawn on both (unless the layer was
* created with the SkCanvas::kClipToLayer_SaveFlag flag.)
*
* A way to implement layers is to create an FBO for each layer, backed by an RGBA
* texture. Unfortunately, this is inefficient as it requires every primitive to
* be drawn n + 1 times, where n is the number of active layers. In practice this
* means, for every primitive:
* - Switch active frame buffer
* - Change viewport, clip and projection matrix
* - Issue the drawing
*
* Switching rendering target n + 1 times per drawn primitive is extremely costly.
* To avoid this, layers are implemented in a different way here, at least in the
* general case. FBOs are used, as an optimization, when the "clip to layer" flag
* is set. When this flag is set we can redirect all drawing operations into a
* single FBO.
*
* This implementation relies on the frame buffer being at least RGBA 8888. When
* a layer is created, only a texture is created, not an FBO. The content of the
* frame buffer contained within the layer's bounds is copied into this texture
* using glCopyTexImage2D(). The layer's region is then cleared(1) in the frame
* buffer and drawing continues as normal. This technique therefore treats the
* frame buffer as a scratch buffer for the layers.
*
* To compose the layers back onto the frame buffer, each layer texture
* (containing the original frame buffer data) is drawn as a simple quad over
* the frame buffer. The trick is that the quad is set as the composition
* destination in the blending equation, and the frame buffer becomes the source
* of the composition.
*
* Drawing layers with an alpha value requires an extra step before composition.
* An empty quad is drawn over the layer's region in the frame buffer. This quad
* is drawn with the rgba color (0,0,0,alpha). The alpha value offered by the
* quad is used to multiply the colors in the frame buffer. This is achieved by
* changing the GL blend functions for the GL_FUNC_ADD blend equation to
* GL_ZERO, GL_SRC_ALPHA.
*
* Because glCopyTexImage2D() can be slow, an alternative implementation might
* be use to draw a single clipped layer. The implementation described above
* is correct in every case.
*
* (1) The frame buffer is actually not cleared right away. To allow the GPU
* to potentially optimize series of calls to glCopyTexImage2D, the frame
* buffer is left untouched until the first drawing operation. Only when
* something actually gets drawn are the layers regions cleared.
*/
bool OpenGLRenderer::createLayer(float left, float top, float right, float bottom,
int alpha, SkXfermode::Mode mode, int flags, GLuint previousFbo) {
LAYER_LOGD("Requesting layer %.2fx%.2f", right - left, bottom - top);
LAYER_LOGD("Layer cache size = %d", mCaches.layerCache.getSize());
const bool fboLayer = flags & SkCanvas::kClipToLayer_SaveFlag;
// Window coordinates of the layer
Rect clip;
Rect bounds(left, top, right, bottom);
Rect untransformedBounds(bounds);
mSnapshot->transform->mapRect(bounds);
// Layers only make sense if they are in the framebuffer's bounds
if (bounds.intersect(*mSnapshot->clipRect)) {
// We cannot work with sub-pixels in this case
bounds.snapToPixelBoundaries();
// When the layer is not an FBO, we may use glCopyTexImage so we
// need to make sure the layer does not extend outside the bounds
// of the framebuffer
if (!bounds.intersect(mSnapshot->previous->viewport)) {
bounds.setEmpty();
} else if (fboLayer) {
clip.set(bounds);
mat4 inverse;
inverse.loadInverse(*mSnapshot->transform);
inverse.mapRect(clip);
clip.snapToPixelBoundaries();
if (clip.intersect(untransformedBounds)) {
clip.translate(-left, -top);
bounds.set(untransformedBounds);
} else {
clip.setEmpty();
}
}
} else {
bounds.setEmpty();
}
if (bounds.isEmpty() || bounds.getWidth() > mCaches.maxTextureSize ||
bounds.getHeight() > mCaches.maxTextureSize ||
(fboLayer && clip.isEmpty())) {
mSnapshot->empty = fboLayer;
} else {
mSnapshot->invisible = mSnapshot->invisible || (alpha <= ALPHA_THRESHOLD && fboLayer);
}
// Bail out if we won't draw in this snapshot
if (mSnapshot->invisible || mSnapshot->empty) {
return false;
}
mCaches.activeTexture(0);
Layer* layer = mCaches.layerCache.get(bounds.getWidth(), bounds.getHeight());
if (!layer) {
return false;
}
layer->setAlpha(alpha, mode);
layer->layer.set(bounds);
layer->texCoords.set(0.0f, bounds.getHeight() / float(layer->getHeight()),
bounds.getWidth() / float(layer->getWidth()), 0.0f);
layer->setColorFilter(mColorFilter);
layer->setBlend(true);
layer->setDirty(false);
// Save the layer in the snapshot
mSnapshot->flags |= Snapshot::kFlagIsLayer;
mSnapshot->layer = layer;
if (fboLayer) {
return createFboLayer(layer, bounds, clip, previousFbo);
} else {
// Copy the framebuffer into the layer
layer->bindTexture();
if (!bounds.isEmpty()) {
if (layer->isEmpty()) {
glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
bounds.left, mSnapshot->height - bounds.bottom,
layer->getWidth(), layer->getHeight(), 0);
layer->setEmpty(false);
} else {
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, bounds.left,
mSnapshot->height - bounds.bottom, bounds.getWidth(), bounds.getHeight());
}
// Enqueue the buffer coordinates to clear the corresponding region later
mLayers.push(new Rect(bounds));
}
}
return true;
}
bool OpenGLRenderer::createFboLayer(Layer* layer, Rect& bounds, Rect& clip, GLuint previousFbo) {
layer->setFbo(mCaches.fboCache.get());
mSnapshot->region = &mSnapshot->layer->region;
mSnapshot->flags |= Snapshot::kFlagFboTarget;
mSnapshot->flags |= Snapshot::kFlagIsFboLayer;
mSnapshot->fbo = layer->getFbo();
mSnapshot->resetTransform(-bounds.left, -bounds.top, 0.0f);
mSnapshot->resetClip(clip.left, clip.top, clip.right, clip.bottom);
mSnapshot->viewport.set(0.0f, 0.0f, bounds.getWidth(), bounds.getHeight());
mSnapshot->height = bounds.getHeight();
mSnapshot->flags |= Snapshot::kFlagDirtyOrtho;
mSnapshot->orthoMatrix.load(mOrthoMatrix);
endTiling();
debugOverdraw(false, false);
// Bind texture to FBO
glBindFramebuffer(GL_FRAMEBUFFER, layer->getFbo());
layer->bindTexture();
// Initialize the texture if needed
if (layer->isEmpty()) {
layer->allocateTexture(GL_RGBA, GL_UNSIGNED_BYTE);
layer->setEmpty(false);
}
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
layer->getTexture(), 0);
startTiling(mSnapshot);
// Clear the FBO, expand the clear region by 1 to get nice bilinear filtering
mCaches.enableScissor();
mCaches.setScissor(clip.left - 1.0f, bounds.getHeight() - clip.bottom - 1.0f,
clip.getWidth() + 2.0f, clip.getHeight() + 2.0f);
glClear(GL_COLOR_BUFFER_BIT);
dirtyClip();
// Change the ortho projection
glViewport(0, 0, bounds.getWidth(), bounds.getHeight());
mOrthoMatrix.loadOrtho(0.0f, bounds.getWidth(), bounds.getHeight(), 0.0f, -1.0f, 1.0f);
return true;
}
/**
* Read the documentation of createLayer() before doing anything in this method.
*/
void OpenGLRenderer::composeLayer(sp<Snapshot> current, sp<Snapshot> previous) {
if (!current->layer) {
ALOGE("Attempting to compose a layer that does not exist");
return;
}
const bool fboLayer = current->flags & Snapshot::kFlagIsFboLayer;
if (fboLayer) {
endTiling();
// Detach the texture from the FBO
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 0, 0);
// Unbind current FBO and restore previous one
glBindFramebuffer(GL_FRAMEBUFFER, previous->fbo);
debugOverdraw(true, false);
startTiling(previous);
}
Layer* layer = current->layer;
const Rect& rect = layer->layer;
if (!fboLayer && layer->getAlpha() < 255) {
drawColorRect(rect.left, rect.top, rect.right, rect.bottom,
layer->getAlpha() << 24, SkXfermode::kDstIn_Mode, true);
// Required below, composeLayerRect() will divide by 255
layer->setAlpha(255);
}
mCaches.unbindMeshBuffer();
mCaches.activeTexture(0);
// When the layer is stored in an FBO, we can save a bit of fillrate by
// drawing only the dirty region
if (fboLayer) {
dirtyLayer(rect.left, rect.top, rect.right, rect.bottom, *previous->transform);
if (layer->getColorFilter()) {
setupColorFilter(layer->getColorFilter());
}
composeLayerRegion(layer, rect);
if (layer->getColorFilter()) {
resetColorFilter();
}
} else if (!rect.isEmpty()) {
dirtyLayer(rect.left, rect.top, rect.right, rect.bottom);
composeLayerRect(layer, rect, true);
}
if (fboLayer) {
// Note: No need to use glDiscardFramebufferEXT() since we never
// create/compose layers that are not on screen with this
// code path
// See LayerRenderer::destroyLayer(Layer*)
// Put the FBO name back in the cache, if it doesn't fit, it will be destroyed
mCaches.fboCache.put(current->fbo);
layer->setFbo(0);
}
dirtyClip();
// Failing to add the layer to the cache should happen only if the layer is too large
if (!mCaches.layerCache.put(layer)) {
LAYER_LOGD("Deleting layer");
Caches::getInstance().resourceCache.decrementRefcount(layer);
}
}
void OpenGLRenderer::drawTextureLayer(Layer* layer, const Rect& rect) {
float alpha = layer->getAlpha() / 255.0f;
setupDraw();
if (layer->getRenderTarget() == GL_TEXTURE_2D) {
setupDrawWithTexture();
} else {
setupDrawWithExternalTexture();
}
setupDrawTextureTransform();
setupDrawColor(alpha, alpha, alpha, alpha);
setupDrawColorFilter();
setupDrawBlending(layer->isBlend() || alpha < 1.0f, layer->getMode());
setupDrawProgram();
setupDrawPureColorUniforms();
setupDrawColorFilterUniforms();
if (layer->getRenderTarget() == GL_TEXTURE_2D) {
setupDrawTexture(layer->getTexture());
} else {
setupDrawExternalTexture(layer->getTexture());
}
if (mSnapshot->transform->isPureTranslate() &&
layer->getWidth() == (uint32_t) rect.getWidth() &&
layer->getHeight() == (uint32_t) rect.getHeight()) {
const float x = (int) floorf(rect.left + mSnapshot->transform->getTranslateX() + 0.5f);
const float y = (int) floorf(rect.top + mSnapshot->transform->getTranslateY() + 0.5f);
layer->setFilter(GL_NEAREST);
setupDrawModelView(x, y, x + rect.getWidth(), y + rect.getHeight(), true);
} else {
layer->setFilter(GL_LINEAR);
setupDrawModelView(rect.left, rect.top, rect.right, rect.bottom);
}
setupDrawTextureTransformUniforms(layer->getTexTransform());
setupDrawMesh(&mMeshVertices[0].position[0], &mMeshVertices[0].texture[0]);
glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount);
finishDrawTexture();
}
void OpenGLRenderer::composeLayerRect(Layer* layer, const Rect& rect, bool swap) {
if (!layer->isTextureLayer()) {
const Rect& texCoords = layer->texCoords;
resetDrawTextureTexCoords(texCoords.left, texCoords.top,
texCoords.right, texCoords.bottom);
float x = rect.left;
float y = rect.top;
bool simpleTransform = mSnapshot->transform->isPureTranslate() &&
layer->getWidth() == (uint32_t) rect.getWidth() &&
layer->getHeight() == (uint32_t) rect.getHeight();
if (simpleTransform) {
// When we're swapping, the layer is already in screen coordinates
if (!swap) {
x = (int) floorf(rect.left + mSnapshot->transform->getTranslateX() + 0.5f);
y = (int) floorf(rect.top + mSnapshot->transform->getTranslateY() + 0.5f);
}
layer->setFilter(GL_NEAREST, true);
} else {
layer->setFilter(GL_LINEAR, true);
}
drawTextureMesh(x, y, x + rect.getWidth(), y + rect.getHeight(),
layer->getTexture(), layer->getAlpha() / 255.0f,
layer->getMode(), layer->isBlend(),
&mMeshVertices[0].position[0], &mMeshVertices[0].texture[0],
GL_TRIANGLE_STRIP, gMeshCount, swap, swap || simpleTransform);
resetDrawTextureTexCoords(0.0f, 0.0f, 1.0f, 1.0f);
} else {
resetDrawTextureTexCoords(0.0f, 1.0f, 1.0f, 0.0f);
drawTextureLayer(layer, rect);
resetDrawTextureTexCoords(0.0f, 0.0f, 1.0f, 1.0f);
}
}
void OpenGLRenderer::composeLayerRegion(Layer* layer, const Rect& rect) {
if (layer->region.isRect()) {
layer->setRegionAsRect();
composeLayerRect(layer, layer->regionRect);
layer->region.clear();
return;
}
// TODO: See LayerRenderer.cpp::generateMesh() for important
// information about this implementation
if (CC_LIKELY(!layer->region.isEmpty())) {
size_t count;
const android::Rect* rects = layer->region.getArray(&count);
const float alpha = layer->getAlpha() / 255.0f;
const float texX = 1.0f / float(layer->getWidth());
const float texY = 1.0f / float(layer->getHeight());
const float height = rect.getHeight();
TextureVertex* mesh = mCaches.getRegionMesh();
GLsizei numQuads = 0;
setupDraw();
setupDrawWithTexture();
setupDrawColor(alpha, alpha, alpha, alpha);
setupDrawColorFilter();
setupDrawBlending(layer->isBlend() || alpha < 1.0f, layer->getMode(), false);
setupDrawProgram();
setupDrawDirtyRegionsDisabled();
setupDrawPureColorUniforms();
setupDrawColorFilterUniforms();
setupDrawTexture(layer->getTexture());
if (mSnapshot->transform->isPureTranslate()) {
const float x = (int) floorf(rect.left + mSnapshot->transform->getTranslateX() + 0.5f);
const float y = (int) floorf(rect.top + mSnapshot->transform->getTranslateY() + 0.5f);
layer->setFilter(GL_NEAREST);
setupDrawModelViewTranslate(x, y, x + rect.getWidth(), y + rect.getHeight(), true);
} else {
layer->setFilter(GL_LINEAR);
setupDrawModelViewTranslate(rect.left, rect.top, rect.right, rect.bottom);
}
setupDrawMeshIndices(&mesh[0].position[0], &mesh[0].texture[0]);
for (size_t i = 0; i < count; i++) {
const android::Rect* r = &rects[i];
const float u1 = r->left * texX;
const float v1 = (height - r->top) * texY;
const float u2 = r->right * texX;
const float v2 = (height - r->bottom) * texY;
// TODO: Reject quads outside of the clip
TextureVertex::set(mesh++, r->left, r->top, u1, v1);
TextureVertex::set(mesh++, r->right, r->top, u2, v1);
TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
numQuads++;
if (numQuads >= REGION_MESH_QUAD_COUNT) {
glDrawElements(GL_TRIANGLES, numQuads * 6, GL_UNSIGNED_SHORT, NULL);
numQuads = 0;
mesh = mCaches.getRegionMesh();
}
}
if (numQuads > 0) {
glDrawElements(GL_TRIANGLES, numQuads * 6, GL_UNSIGNED_SHORT, NULL);
}
finishDrawTexture();
#if DEBUG_LAYERS_AS_REGIONS
drawRegionRects(layer->region);
#endif
layer->region.clear();
}
}
void OpenGLRenderer::drawRegionRects(const Region& region) {
#if DEBUG_LAYERS_AS_REGIONS
size_t count;
const android::Rect* rects = region.getArray(&count);
uint32_t colors[] = {
0x7fff0000, 0x7f00ff00,
0x7f0000ff, 0x7fff00ff,
};
int offset = 0;
int32_t top = rects[0].top;
for (size_t i = 0; i < count; i++) {
if (top != rects[i].top) {
offset ^= 0x2;
top = rects[i].top;
}
Rect r(rects[i].left, rects[i].top, rects[i].right, rects[i].bottom);
drawColorRect(r.left, r.top, r.right, r.bottom, colors[offset + (i & 0x1)],
SkXfermode::kSrcOver_Mode);
}
#endif
}
void OpenGLRenderer::dirtyLayer(const float left, const float top,
const float right, const float bottom, const mat4 transform) {
if (hasLayer()) {
Rect bounds(left, top, right, bottom);
transform.mapRect(bounds);
dirtyLayerUnchecked(bounds, getRegion());
}
}
void OpenGLRenderer::dirtyLayer(const float left, const float top,
const float right, const float bottom) {
if (hasLayer()) {
Rect bounds(left, top, right, bottom);
dirtyLayerUnchecked(bounds, getRegion());
}
}
void OpenGLRenderer::dirtyLayerUnchecked(Rect& bounds, Region* region) {
if (bounds.intersect(*mSnapshot->clipRect)) {
bounds.snapToPixelBoundaries();
android::Rect dirty(bounds.left, bounds.top, bounds.right, bounds.bottom);
if (!dirty.isEmpty()) {
region->orSelf(dirty);
}
}
}
void OpenGLRenderer::clearLayerRegions() {
const size_t count = mLayers.size();
if (count == 0) return;
if (!mSnapshot->isIgnored()) {
// Doing several glScissor/glClear here can negatively impact
// GPUs with a tiler architecture, instead we draw quads with
// the Clear blending mode
// The list contains bounds that have already been clipped
// against their initial clip rect, and the current clip
// is likely different so we need to disable clipping here
bool scissorChanged = mCaches.disableScissor();
Vertex mesh[count * 6];
Vertex* vertex = mesh;
for (uint32_t i = 0; i < count; i++) {
Rect* bounds = mLayers.itemAt(i);
Vertex::set(vertex++, bounds->left, bounds->bottom);
Vertex::set(vertex++, bounds->left, bounds->top);
Vertex::set(vertex++, bounds->right, bounds->top);
Vertex::set(vertex++, bounds->left, bounds->bottom);
Vertex::set(vertex++, bounds->right, bounds->top);
Vertex::set(vertex++, bounds->right, bounds->bottom);
delete bounds;
}
setupDraw(false);
setupDrawColor(0.0f, 0.0f, 0.0f, 1.0f);
setupDrawBlending(true, SkXfermode::kClear_Mode);
setupDrawProgram();
setupDrawPureColorUniforms();
setupDrawModelViewTranslate(0.0f, 0.0f, 0.0f, 0.0f, true);
setupDrawVertices(&mesh[0].position[0]);
glDrawArrays(GL_TRIANGLES, 0, count * 6);
if (scissorChanged) mCaches.enableScissor();
} else {
for (uint32_t i = 0; i < count; i++) {
delete mLayers.itemAt(i);
}
}
mLayers.clear();
}
///////////////////////////////////////////////////////////////////////////////
// Transforms
///////////////////////////////////////////////////////////////////////////////
void OpenGLRenderer::translate(float dx, float dy) {
mSnapshot->transform->translate(dx, dy, 0.0f);
}
void OpenGLRenderer::rotate(float degrees) {
mSnapshot->transform->rotate(degrees, 0.0f, 0.0f, 1.0f);
}
void OpenGLRenderer::scale(float sx, float sy) {
mSnapshot->transform->scale(sx, sy, 1.0f);
}
void OpenGLRenderer::skew(float sx, float sy) {
mSnapshot->transform->skew(sx, sy);
}
void OpenGLRenderer::setMatrix(SkMatrix* matrix) {
if (matrix) {
mSnapshot->transform->load(*matrix);
} else {
mSnapshot->transform->loadIdentity();
}
}
void OpenGLRenderer::getMatrix(SkMatrix* matrix) {
mSnapshot->transform->copyTo(*matrix);
}
void OpenGLRenderer::concatMatrix(SkMatrix* matrix) {
SkMatrix transform;
mSnapshot->transform->copyTo(transform);
transform.preConcat(*matrix);
mSnapshot->transform->load(transform);
}
///////////////////////////////////////////////////////////////////////////////
// Clipping
///////////////////////////////////////////////////////////////////////////////
void OpenGLRenderer::setScissorFromClip() {
Rect clip(*mSnapshot->clipRect);
clip.snapToPixelBoundaries();
if (mCaches.setScissor(clip.left, mSnapshot->height - clip.bottom,
clip.getWidth(), clip.getHeight())) {
mDirtyClip = false;
}
}
const Rect& OpenGLRenderer::getClipBounds() {
return mSnapshot->getLocalClip();
}
bool OpenGLRenderer::quickRejectNoScissor(float left, float top, float right, float bottom) {
if (mSnapshot->isIgnored()) {
return true;
}
Rect r(left, top, right, bottom);
mSnapshot->transform->mapRect(r);
r.snapToPixelBoundaries();
Rect clipRect(*mSnapshot->clipRect);
clipRect.snapToPixelBoundaries();
return !clipRect.intersects(r);
}
bool OpenGLRenderer::quickRejectNoScissor(float left, float top, float right, float bottom,
Rect& transformed, Rect& clip) {
if (mSnapshot->isIgnored()) {
return true;
}
transformed.set(left, top, right, bottom);
mSnapshot->transform->mapRect(transformed);
transformed.snapToPixelBoundaries();
clip.set(*mSnapshot->clipRect);
clip.snapToPixelBoundaries();
return !clip.intersects(transformed);
}
bool OpenGLRenderer::quickRejectPreStroke(float left, float top, float right, float bottom, SkPaint* paint) {
if (paint->getStyle() != SkPaint::kFill_Style) {
float outset = paint->getStrokeWidth() * 0.5f;
return quickReject(left - outset, top - outset, right + outset, bottom + outset);
} else {
return quickReject(left, top, right, bottom);
}
}
bool OpenGLRenderer::quickReject(float left, float top, float right, float bottom) {
if (mSnapshot->isIgnored() || bottom <= top || right <= left) {
return true;
}
Rect r(left, top, right, bottom);
mSnapshot->transform->mapRect(r);
r.snapToPixelBoundaries();
Rect clipRect(*mSnapshot->clipRect);
clipRect.snapToPixelBoundaries();
bool rejected = !clipRect.intersects(r);
if (!isDeferred() && !rejected) {
mCaches.setScissorEnabled(mScissorOptimizationDisabled || !clipRect.contains(r));
}
return rejected;
}
bool OpenGLRenderer::clipRect(float left, float top, float right, float bottom, SkRegion::Op op) {
bool clipped = mSnapshot->clip(left, top, right, bottom, op);
if (clipped) {
dirtyClip();
}
return !mSnapshot->clipRect->isEmpty();
}
Rect* OpenGLRenderer::getClipRect() {
return mSnapshot->clipRect;
}
///////////////////////////////////////////////////////////////////////////////
// Drawing commands
///////////////////////////////////////////////////////////////////////////////
void OpenGLRenderer::setupDraw(bool clear) {
// TODO: It would be best if we could do this before quickReject()
// changes the scissor test state
if (clear) clearLayerRegions();
if (mDirtyClip) {
setScissorFromClip();
}
mDescription.reset();
mSetShaderColor = false;
mColorSet = false;
mColorA = mColorR = mColorG = mColorB = 0.0f;
mTextureUnit = 0;
mTrackDirtyRegions = true;
}
void OpenGLRenderer::setupDrawWithTexture(bool isAlpha8) {
mDescription.hasTexture = true;
mDescription.hasAlpha8Texture = isAlpha8;
}
void OpenGLRenderer::setupDrawWithExternalTexture() {
mDescription.hasExternalTexture = true;
}
void OpenGLRenderer::setupDrawNoTexture() {
mCaches.disbaleTexCoordsVertexArray();
}
void OpenGLRenderer::setupDrawAA() {
mDescription.isAA = true;
}
void OpenGLRenderer::setupDrawVertexShape() {
mDescription.isVertexShape = true;
}
void OpenGLRenderer::setupDrawPoint(float pointSize) {
mDescription.isPoint = true;
mDescription.pointSize = pointSize;
}
void OpenGLRenderer::setupDrawColor(int color) {
setupDrawColor(color, (color >> 24) & 0xFF);
}
void OpenGLRenderer::setupDrawColor(int color, int alpha) {
mColorA = alpha / 255.0f;
// Second divide of a by 255 is an optimization, allowing us to simply multiply
// the rgb values by a instead of also dividing by 255
const float a = mColorA / 255.0f;
mColorR = a * ((color >> 16) & 0xFF);
mColorG = a * ((color >> 8) & 0xFF);
mColorB = a * ((color ) & 0xFF);
mColorSet = true;
mSetShaderColor = mDescription.setColor(mColorR, mColorG, mColorB, mColorA);
}
void OpenGLRenderer::setupDrawAlpha8Color(int color, int alpha) {
mColorA = alpha / 255.0f;
// Double-divide of a by 255 is an optimization, allowing us to simply multiply
// the rgb values by a instead of also dividing by 255
const float a = mColorA / 255.0f;
mColorR = a * ((color >> 16) & 0xFF);
mColorG = a * ((color >> 8) & 0xFF);
mColorB = a * ((color ) & 0xFF);
mColorSet = true;
mSetShaderColor = mDescription.setAlpha8Color(mColorR, mColorG, mColorB, mColorA);
}
void OpenGLRenderer::setupDrawTextGamma(const SkPaint* paint) {
mCaches.fontRenderer->describe(mDescription, paint);
}
void OpenGLRenderer::setupDrawColor(float r, float g, float b, float a) {
mColorA = a;
mColorR = r;
mColorG = g;
mColorB = b;
mColorSet = true;
mSetShaderColor = mDescription.setColor(r, g, b, a);
}
void OpenGLRenderer::setupDrawShader() {
if (mShader) {
mShader->describe(mDescription, mCaches.extensions);
}
}
void OpenGLRenderer::setupDrawColorFilter() {
if (mColorFilter) {
mColorFilter->describe(mDescription, mCaches.extensions);
}
}
void OpenGLRenderer::accountForClear(SkXfermode::Mode mode) {
if (mColorSet && mode == SkXfermode::kClear_Mode) {
mColorA = 1.0f;
mColorR = mColorG = mColorB = 0.0f;
mSetShaderColor = mDescription.modulate = true;
}
}
void OpenGLRenderer::setupDrawBlending(SkXfermode::Mode mode, bool swapSrcDst) {
// When the blending mode is kClear_Mode, we need to use a modulate color
// argb=1,0,0,0
accountForClear(mode);
chooseBlending((mColorSet && mColorA < 1.0f) || (mShader && mShader->blend()), mode,
mDescription, swapSrcDst);
}
void OpenGLRenderer::setupDrawBlending(bool blend, SkXfermode::Mode mode, bool swapSrcDst) {
// When the blending mode is kClear_Mode, we need to use a modulate color
// argb=1,0,0,0
accountForClear(mode);
chooseBlending(blend || (mColorSet && mColorA < 1.0f) || (mShader && mShader->blend()) ||
(mColorFilter && mColorFilter->blend()), mode, mDescription, swapSrcDst);
}
void OpenGLRenderer::setupDrawProgram() {
useProgram(mCaches.programCache.get(mDescription));
}
void OpenGLRenderer::setupDrawDirtyRegionsDisabled() {
mTrackDirtyRegions = false;
}
void OpenGLRenderer::setupDrawModelViewTranslate(float left, float top, float right, float bottom,
bool ignoreTransform) {
mModelView.loadTranslate(left, top, 0.0f);
if (!ignoreTransform) {
mCaches.currentProgram->set(mOrthoMatrix, mModelView, *mSnapshot->transform);
if (mTrackDirtyRegions) dirtyLayer(left, top, right, bottom, *mSnapshot->transform);
} else {
mCaches.currentProgram->set(mOrthoMatrix, mModelView, mIdentity);
if (mTrackDirtyRegions) dirtyLayer(left, top, right, bottom);
}
}
void OpenGLRenderer::setupDrawModelViewIdentity(bool offset) {
mCaches.currentProgram->set(mOrthoMatrix, mIdentity, *mSnapshot->transform, offset);
}
void OpenGLRenderer::setupDrawModelView(float left, float top, float right, float bottom,
bool ignoreTransform, bool ignoreModelView) {
if (!ignoreModelView) {
mModelView.loadTranslate(left, top, 0.0f);
mModelView.scale(right - left, bottom - top, 1.0f);
} else {
mModelView.loadIdentity();
}
bool dirty = right - left > 0.0f && bottom - top > 0.0f;
if (!ignoreTransform) {
mCaches.currentProgram->set(mOrthoMatrix, mModelView, *mSnapshot->transform);
if (mTrackDirtyRegions && dirty) {
dirtyLayer(left, top, right, bottom, *mSnapshot->transform);
}
} else {
mCaches.currentProgram->set(mOrthoMatrix, mModelView, mIdentity);
if (mTrackDirtyRegions && dirty) dirtyLayer(left, top, right, bottom);
}
}
void OpenGLRenderer::setupDrawPointUniforms() {
int slot = mCaches.currentProgram->getUniform("pointSize");
glUniform1f(slot, mDescription.pointSize);
}
void OpenGLRenderer::setupDrawColorUniforms() {
if ((mColorSet && !mShader) || (mShader && mSetShaderColor)) {
mCaches.currentProgram->setColor(mColorR, mColorG, mColorB, mColorA);
}
}
void OpenGLRenderer::setupDrawPureColorUniforms() {
if (mSetShaderColor) {
mCaches.currentProgram->setColor(mColorR, mColorG, mColorB, mColorA);
}
}
void OpenGLRenderer::setupDrawShaderUniforms(bool ignoreTransform) {
if (mShader) {
if (ignoreTransform) {
mModelView.loadInverse(*mSnapshot->transform);
}
mShader->setupProgram(mCaches.currentProgram, mModelView, *mSnapshot, &mTextureUnit);
}
}
void OpenGLRenderer::setupDrawShaderIdentityUniforms() {
if (mShader) {
mShader->setupProgram(mCaches.currentProgram, mIdentity, *mSnapshot, &mTextureUnit);
}
}
void OpenGLRenderer::setupDrawColorFilterUniforms() {
if (mColorFilter) {
mColorFilter->setupProgram(mCaches.currentProgram);
}
}
void OpenGLRenderer::setupDrawTextGammaUniforms() {
mCaches.fontRenderer->setupProgram(mDescription, mCaches.currentProgram);
}
void OpenGLRenderer::setupDrawSimpleMesh() {
bool force = mCaches.bindMeshBuffer();
mCaches.bindPositionVertexPointer(force, 0);
mCaches.unbindIndicesBuffer();
}
void OpenGLRenderer::setupDrawTexture(GLuint texture) {
bindTexture(texture);
mTextureUnit++;
mCaches.enableTexCoordsVertexArray();
}
void OpenGLRenderer::setupDrawExternalTexture(GLuint texture) {
bindExternalTexture(texture);
mTextureUnit++;
mCaches.enableTexCoordsVertexArray();
}
void OpenGLRenderer::setupDrawTextureTransform() {
mDescription.hasTextureTransform = true;
}
void OpenGLRenderer::setupDrawTextureTransformUniforms(mat4& transform) {
glUniformMatrix4fv(mCaches.currentProgram->getUniform("mainTextureTransform"), 1,
GL_FALSE, &transform.data[0]);
}
void OpenGLRenderer::setupDrawMesh(GLvoid* vertices, GLvoid* texCoords, GLuint vbo) {
bool force = false;
if (!vertices) {
force = mCaches.bindMeshBuffer(vbo == 0 ? mCaches.meshBuffer : vbo);
} else {
force = mCaches.unbindMeshBuffer();
}
mCaches.bindPositionVertexPointer(force, vertices);
if (mCaches.currentProgram->texCoords >= 0) {
mCaches.bindTexCoordsVertexPointer(force, texCoords);
}
mCaches.unbindIndicesBuffer();
}
void OpenGLRenderer::setupDrawMeshIndices(GLvoid* vertices, GLvoid* texCoords) {
bool force = mCaches.unbindMeshBuffer();
mCaches.bindPositionVertexPointer(force, vertices);
if (mCaches.currentProgram->texCoords >= 0) {
mCaches.bindTexCoordsVertexPointer(force, texCoords);
}
}
void OpenGLRenderer::setupDrawVertices(GLvoid* vertices) {
bool force = mCaches.unbindMeshBuffer();
mCaches.bindPositionVertexPointer(force, vertices, gVertexStride);
mCaches.unbindIndicesBuffer();
}
/**
* Sets up the shader to draw an AA line. We draw AA lines with quads, where there is an
* outer boundary that fades out to 0. The variables set in the shader define the proportion of
* the width and length of the primitive occupied by the AA region. The vtxWidth and vtxLength
* attributes (one per vertex) are values from zero to one that tells the fragment
* shader where the fragment is in relation to the line width/length overall; these values are
* then used to compute the proper color, based on whether the fragment lies in the fading AA
* region of the line.
* Note that we only pass down the width values in this setup function. The length coordinates
* are set up for each individual segment.
*/
void OpenGLRenderer::setupDrawAALine(GLvoid* vertices, GLvoid* widthCoords,
GLvoid* lengthCoords, float boundaryWidthProportion, int& widthSlot, int& lengthSlot) {
bool force = mCaches.unbindMeshBuffer();
mCaches.bindPositionVertexPointer(force, vertices, gAAVertexStride);
mCaches.resetTexCoordsVertexPointer();
mCaches.unbindIndicesBuffer();
widthSlot = mCaches.currentProgram->getAttrib("vtxWidth");
glEnableVertexAttribArray(widthSlot);
glVertexAttribPointer(widthSlot, 1, GL_FLOAT, GL_FALSE, gAAVertexStride, widthCoords);
lengthSlot = mCaches.currentProgram->getAttrib("vtxLength");
glEnableVertexAttribArray(lengthSlot);
glVertexAttribPointer(lengthSlot, 1, GL_FLOAT, GL_FALSE, gAAVertexStride, lengthCoords);
int boundaryWidthSlot = mCaches.currentProgram->getUniform("boundaryWidth");
glUniform1f(boundaryWidthSlot, boundaryWidthProportion);
}
void OpenGLRenderer::finishDrawAALine(const int widthSlot, const int lengthSlot) {
glDisableVertexAttribArray(widthSlot);
glDisableVertexAttribArray(lengthSlot);
}
void OpenGLRenderer::finishDrawTexture() {
}
///////////////////////////////////////////////////////////////////////////////
// Drawing
///////////////////////////////////////////////////////////////////////////////
status_t OpenGLRenderer::drawDisplayList(DisplayList* displayList,
Rect& dirty, int32_t flags, uint32_t level) {
// All the usual checks and setup operations (quickReject, setupDraw, etc.)
// will be performed by the display list itself
if (displayList && displayList->isRenderable()) {
return displayList->replay(*this, dirty, flags, level);
}
return DrawGlInfo::kStatusDone;
}
void OpenGLRenderer::outputDisplayList(DisplayList* displayList, uint32_t level) {
if (displayList) {
displayList->output(*this, level);
}
}
void OpenGLRenderer::drawAlphaBitmap(Texture* texture, float left, float top, SkPaint* paint) {
int alpha;
SkXfermode::Mode mode;
getAlphaAndMode(paint, &alpha, &mode);
float x = left;
float y = top;
GLenum filter = GL_LINEAR;
bool ignoreTransform = false;
if (mSnapshot->transform->isPureTranslate()) {
x = (int) floorf(left + mSnapshot->transform->getTranslateX() + 0.5f);
y = (int) floorf(top + mSnapshot->transform->getTranslateY() + 0.5f);
ignoreTransform = true;
filter = GL_NEAREST;
} else {
filter = FILTER(paint);
}
setupDraw();
setupDrawWithTexture(true);
if (paint) {
setupDrawAlpha8Color(paint->getColor(), alpha);
}
setupDrawColorFilter();
setupDrawShader();
setupDrawBlending(true, mode);
setupDrawProgram();
setupDrawModelView(x, y, x + texture->width, y + texture->height, ignoreTransform);
setupDrawTexture(texture->id);
texture->setWrap(GL_CLAMP_TO_EDGE);
texture->setFilter(filter);
setupDrawPureColorUniforms();
setupDrawColorFilterUniforms();
setupDrawShaderUniforms();
setupDrawMesh(NULL, (GLvoid*) gMeshTextureOffset);
glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount);
finishDrawTexture();
}
status_t OpenGLRenderer::drawBitmap(SkBitmap* bitmap, float left, float top, SkPaint* paint) {
const float right = left + bitmap->width();
const float bottom = top + bitmap->height();
if (quickReject(left, top, right, bottom)) {
return DrawGlInfo::kStatusDone;
}
mCaches.activeTexture(0);
Texture* texture = mCaches.textureCache.get(bitmap);
if (!texture) return DrawGlInfo::kStatusDone;
const AutoTexture autoCleanup(texture);
if (CC_UNLIKELY(bitmap->getConfig() == SkBitmap::kA8_Config)) {
drawAlphaBitmap(texture, left, top, paint);
} else {
drawTextureRect(left, top, right, bottom, texture, paint);
}
return DrawGlInfo::kStatusDrew;
}
status_t OpenGLRenderer::drawBitmap(SkBitmap* bitmap, SkMatrix* matrix, SkPaint* paint) {
Rect r(0.0f, 0.0f, bitmap->width(), bitmap->height());
const mat4 transform(*matrix);
transform.mapRect(r);
if (quickReject(r.left, r.top, r.right, r.bottom)) {
return DrawGlInfo::kStatusDone;
}
mCaches.activeTexture(0);
Texture* texture = mCaches.textureCache.get(bitmap);
if (!texture) return DrawGlInfo::kStatusDone;
const AutoTexture autoCleanup(texture);
// This could be done in a cheaper way, all we need is pass the matrix
// to the vertex shader. The save/restore is a bit overkill.
save(SkCanvas::kMatrix_SaveFlag);
concatMatrix(matrix);
drawTextureRect(0.0f, 0.0f, bitmap->width(), bitmap->height(), texture, paint);
restore();
return DrawGlInfo::kStatusDrew;
}
status_t OpenGLRenderer::drawBitmapData(SkBitmap* bitmap, float left, float top, SkPaint* paint) {
const float right = left + bitmap->width();
const float bottom = top + bitmap->height();
if (quickReject(left, top, right, bottom)) {
return DrawGlInfo::kStatusDone;
}
mCaches.activeTexture(0);
Texture* texture = mCaches.textureCache.getTransient(bitmap);
const AutoTexture autoCleanup(texture);
drawTextureRect(left, top, right, bottom, texture, paint);
return DrawGlInfo::kStatusDrew;
}
status_t OpenGLRenderer::drawBitmapMesh(SkBitmap* bitmap, int meshWidth, int meshHeight,
float* vertices, int* colors, SkPaint* paint) {
if (!vertices || mSnapshot->isIgnored()) {
return DrawGlInfo::kStatusDone;
}
// TODO: We should compute the bounding box when recording the display list
float left = FLT_MAX;
float top = FLT_MAX;
float right = FLT_MIN;
float bottom = FLT_MIN;
const uint32_t count = meshWidth * meshHeight * 6;
// TODO: Support the colors array
TextureVertex mesh[count];
TextureVertex* vertex = mesh;
for (int32_t y = 0; y < meshHeight; y++) {
for (int32_t x = 0; x < meshWidth; x++) {
uint32_t i = (y * (meshWidth + 1) + x) * 2;
float u1 = float(x) / meshWidth;
float u2 = float(x + 1) / meshWidth;
float v1 = float(y) / meshHeight;
float v2 = float(y + 1) / meshHeight;
int ax = i + (meshWidth + 1) * 2;
int ay = ax + 1;
int bx = i;
int by = bx + 1;
int cx = i + 2;
int cy = cx + 1;
int dx = i + (meshWidth + 1) * 2 + 2;
int dy = dx + 1;
TextureVertex::set(vertex++, vertices[ax], vertices[ay], u1, v2);
TextureVertex::set(vertex++, vertices[bx], vertices[by], u1, v1);
TextureVertex::set(vertex++, vertices[cx], vertices[cy], u2, v1);
TextureVertex::set(vertex++, vertices[ax], vertices[ay], u1, v2);
TextureVertex::set(vertex++, vertices[cx], vertices[cy], u2, v1);
TextureVertex::set(vertex++, vertices[dx], vertices[dy], u2, v2);
// TODO: This could be optimized to avoid unnecessary ops
left = fminf(left, fminf(vertices[ax], fminf(vertices[bx], vertices[cx])));
top = fminf(top, fminf(vertices[ay], fminf(vertices[by], vertices[cy])));
right = fmaxf(right, fmaxf(vertices[ax], fmaxf(vertices[bx], vertices[cx])));
bottom = fmaxf(bottom, fmaxf(vertices[ay], fmaxf(vertices[by], vertices[cy])));
}
}
if (quickReject(left, top, right, bottom)) {
return DrawGlInfo::kStatusDone;
}
mCaches.activeTexture(0);
Texture* texture = mCaches.textureCache.get(bitmap);
if (!texture) return DrawGlInfo::kStatusDone;
const AutoTexture autoCleanup(texture);
texture->setWrap(GL_CLAMP_TO_EDGE, true);
texture->setFilter(FILTER(paint), true);
int alpha;
SkXfermode::Mode mode;
getAlphaAndMode(paint, &alpha, &mode);
if (hasLayer()) {
dirtyLayer(left, top, right, bottom, *mSnapshot->transform);
}
drawTextureMesh(0.0f, 0.0f, 1.0f, 1.0f, texture->id, alpha / 255.0f,
mode, texture->blend, &mesh[0].position[0], &mesh[0].texture[0],
GL_TRIANGLES, count, false, false, 0, false, false);
return DrawGlInfo::kStatusDrew;
}
status_t OpenGLRenderer::drawBitmap(SkBitmap* bitmap,
float srcLeft, float srcTop, float srcRight, float srcBottom,
float dstLeft, float dstTop, float dstRight, float dstBottom,
SkPaint* paint) {
if (quickReject(dstLeft, dstTop, dstRight, dstBottom)) {
return DrawGlInfo::kStatusDone;
}
mCaches.activeTexture(0);
Texture* texture = mCaches.textureCache.get(bitmap);
if (!texture) return DrawGlInfo::kStatusDone;
const AutoTexture autoCleanup(texture);
const float width = texture->width;
const float height = texture->height;
const float u1 = fmax(0.0f, srcLeft / width);
const float v1 = fmax(0.0f, srcTop / height);
const float u2 = fmin(1.0f, srcRight / width);
const float v2 = fmin(1.0f, srcBottom / height);
mCaches.unbindMeshBuffer();
resetDrawTextureTexCoords(u1, v1, u2, v2);
int alpha;
SkXfermode::Mode mode;
getAlphaAndMode(paint, &alpha, &mode);
texture->setWrap(GL_CLAMP_TO_EDGE, true);
if (CC_LIKELY(mSnapshot->transform->isPureTranslate())) {
const float x = (int) floorf(dstLeft + mSnapshot->transform->getTranslateX() + 0.5f);
const float y = (int) floorf(dstTop + mSnapshot->transform->getTranslateY() + 0.5f);
GLenum filter = GL_NEAREST;
// Enable linear filtering if the source rectangle is scaled
if (srcRight - srcLeft != dstRight - dstLeft || srcBottom - srcTop != dstBottom - dstTop) {
filter = FILTER(paint);
}
texture->setFilter(filter, true);
drawTextureMesh(x, y, x + (dstRight - dstLeft), y + (dstBottom - dstTop),
texture->id, alpha / 255.0f, mode, texture->blend,
&mMeshVertices[0].position[0], &mMeshVertices[0].texture[0],
GL_TRIANGLE_STRIP, gMeshCount, false, true);
} else {
texture->setFilter(FILTER(paint), true);
drawTextureMesh(dstLeft, dstTop, dstRight, dstBottom, texture->id, alpha / 255.0f,
mode, texture->blend, &mMeshVertices[0].position[0], &mMeshVertices[0].texture[0],
GL_TRIANGLE_STRIP, gMeshCount);
}
resetDrawTextureTexCoords(0.0f, 0.0f, 1.0f, 1.0f);
return DrawGlInfo::kStatusDrew;
}
status_t OpenGLRenderer::drawPatch(SkBitmap* bitmap, const int32_t* xDivs, const int32_t* yDivs,
const uint32_t* colors, uint32_t width, uint32_t height, int8_t numColors,
float left, float top, float right, float bottom, SkPaint* paint) {
int alpha;
SkXfermode::Mode mode;
getAlphaAndModeDirect(paint, &alpha, &mode);
return drawPatch(bitmap, xDivs, yDivs, colors, width, height, numColors,
left, top, right, bottom, alpha, mode);
}
status_t OpenGLRenderer::drawPatch(SkBitmap* bitmap, const int32_t* xDivs, const int32_t* yDivs,
const uint32_t* colors, uint32_t width, uint32_t height, int8_t numColors,
float left, float top, float right, float bottom, int alpha, SkXfermode::Mode mode) {
if (quickReject(left, top, right, bottom)) {
return DrawGlInfo::kStatusDone;
}
alpha *= mSnapshot->alpha;
mCaches.activeTexture(0);
Texture* texture = mCaches.textureCache.get(bitmap);
if (!texture) return DrawGlInfo::kStatusDone;
const AutoTexture autoCleanup(texture);
texture->setWrap(GL_CLAMP_TO_EDGE, true);
texture->setFilter(GL_LINEAR, true);
const Patch* mesh = mCaches.patchCache.get(bitmap->width(), bitmap->height(),
right - left, bottom - top, xDivs, yDivs, colors, width, height, numColors);
if (CC_LIKELY(mesh && mesh->verticesCount > 0)) {
const bool pureTranslate = mSnapshot->transform->isPureTranslate();
// Mark the current layer dirty where we are going to draw the patch
if (hasLayer() && mesh->hasEmptyQuads) {
const float offsetX = left + mSnapshot->transform->getTranslateX();
const float offsetY = top + mSnapshot->transform->getTranslateY();
const size_t count = mesh->quads.size();
for (size_t i = 0; i < count; i++) {
const Rect& bounds = mesh->quads.itemAt(i);
if (CC_LIKELY(pureTranslate)) {
const float x = (int) floorf(bounds.left + offsetX + 0.5f);
const float y = (int) floorf(bounds.top + offsetY + 0.5f);
dirtyLayer(x, y, x + bounds.getWidth(), y + bounds.getHeight());
} else {
dirtyLayer(left + bounds.left, top + bounds.top,
left + bounds.right, top + bounds.bottom, *mSnapshot->transform);
}
}
}
if (CC_LIKELY(pureTranslate)) {
const float x = (int) floorf(left + mSnapshot->transform->getTranslateX() + 0.5f);
const float y = (int) floorf(top + mSnapshot->transform->getTranslateY() + 0.5f);
drawTextureMesh(x, y, x + right - left, y + bottom - top, texture->id, alpha / 255.0f,
mode, texture->blend, (GLvoid*) 0, (GLvoid*) gMeshTextureOffset,
GL_TRIANGLES, mesh->verticesCount, false, true, mesh->meshBuffer,
true, !mesh->hasEmptyQuads);
} else {
drawTextureMesh(left, top, right, bottom, texture->id, alpha / 255.0f,
mode, texture->blend, (GLvoid*) 0, (GLvoid*) gMeshTextureOffset,
GL_TRIANGLES, mesh->verticesCount, false, false, mesh->meshBuffer,
true, !mesh->hasEmptyQuads);
}
}
return DrawGlInfo::kStatusDrew;
}
/**
* Renders a convex path via tessellation. For AA paths, this function uses a similar approach to
* that of AA lines in the drawLines() function. We expand the convex path by a half pixel in
* screen space in all directions. However, instead of using a fragment shader to compute the
* translucency of the color from its position, we simply use a varying parameter to define how far
* a given pixel is from the edge. For non-AA paths, the expansion and alpha varying are not used.
*
* Doesn't yet support joins, caps, or path effects.
*/
void OpenGLRenderer::drawConvexPath(const SkPath& path, SkPaint* paint) {
int color = paint->getColor();
SkPaint::Style style = paint->getStyle();
SkXfermode::Mode mode = getXfermode(paint->getXfermode());
bool isAA = paint->isAntiAlias();
VertexBuffer vertexBuffer;
// TODO: try clipping large paths to viewport
PathRenderer::convexPathVertices(path, paint, mSnapshot->transform, vertexBuffer);
if (!vertexBuffer.getSize()) {
// no vertices to draw
return;
}
setupDraw();
setupDrawNoTexture();
if (isAA) setupDrawAA();
setupDrawVertexShape();
setupDrawColor(color, ((color >> 24) & 0xFF) * mSnapshot->alpha);
setupDrawColorFilter();
setupDrawShader();
setupDrawBlending(isAA, mode);
setupDrawProgram();
setupDrawModelViewIdentity();
setupDrawColorUniforms();
setupDrawColorFilterUniforms();
setupDrawShaderIdentityUniforms();
void* vertices = vertexBuffer.getBuffer();
bool force = mCaches.unbindMeshBuffer();
mCaches.bindPositionVertexPointer(true, vertices, isAA ? gAlphaVertexStride : gVertexStride);
mCaches.resetTexCoordsVertexPointer();
mCaches.unbindIndicesBuffer();
int alphaSlot = -1;
if (isAA) {
void* alphaCoords = ((GLbyte*) vertices) + gVertexAlphaOffset;
alphaSlot = mCaches.currentProgram->getAttrib("vtxAlpha");
// TODO: avoid enable/disable in back to back uses of the alpha attribute
glEnableVertexAttribArray(alphaSlot);
glVertexAttribPointer(alphaSlot, 1, GL_FLOAT, GL_FALSE, gAlphaVertexStride, alphaCoords);
}
SkRect bounds = PathRenderer::computePathBounds(path, paint);
dirtyLayer(bounds.fLeft, bounds.fTop, bounds.fRight, bounds.fBottom, *mSnapshot->transform);
glDrawArrays(GL_TRIANGLE_STRIP, 0, vertexBuffer.getSize());
if (isAA) {
glDisableVertexAttribArray(alphaSlot);
}
}
/**
* We draw lines as quads (tristrips). Using GL_LINES can be difficult because the rasterization
* rules for those lines produces some unexpected results, and may vary between hardware devices.
* The basics of lines-as-quads is easy; we simply find the normal to the line and position the
* corners of the quads on either side of each line endpoint, separated by the strokeWidth
* of the line. Hairlines are more involved because we need to account for transform scaling
* to end up with a one-pixel-wide line in screen space..
* Anti-aliased lines add another factor to the approach. We use a specialized fragment shader
* in combination with values that we calculate and pass down in this method. The basic approach
* is that the quad we create contains both the core line area plus a bounding area in which
* the translucent/AA pixels are drawn. The values we calculate tell the shader what
* proportion of the width and the length of a given segment is represented by the boundary
* region. The quad ends up being exactly .5 pixel larger in all directions than the non-AA quad.
* The bounding region is actually 1 pixel wide on all sides (half pixel on the outside, half pixel
* on the inside). This ends up giving the result we want, with pixels that are completely
* 'inside' the line area being filled opaquely and the other pixels being filled according to
* how far into the boundary region they are, which is determined by shader interpolation.
*/
status_t OpenGLRenderer::drawLines(float* points, int count, SkPaint* paint) {
if (mSnapshot->isIgnored()) return DrawGlInfo::kStatusDone;
const bool isAA = paint->isAntiAlias();
// We use half the stroke width here because we're going to position the quad
// corner vertices half of the width away from the line endpoints
float halfStrokeWidth = paint->getStrokeWidth() * 0.5f;
// A stroke width of 0 has a special meaning in Skia:
// it draws a line 1 px wide regardless of current transform
bool isHairLine = paint->getStrokeWidth() == 0.0f;
float inverseScaleX = 1.0f;
float inverseScaleY = 1.0f;
bool scaled = false;
int alpha;
SkXfermode::Mode mode;
int generatedVerticesCount = 0;
int verticesCount = count;
if (count > 4) {
// Polyline: account for extra vertices needed for continuous tri-strip
verticesCount += (count - 4);
}
if (isHairLine || isAA) {
// The quad that we use for AA and hairlines needs to account for scaling. For hairlines
// the line on the screen should always be one pixel wide regardless of scale. For
// AA lines, we only want one pixel of translucent boundary around the quad.
if (CC_UNLIKELY(!mSnapshot->transform->isPureTranslate())) {
Matrix4 *mat = mSnapshot->transform;
float m00 = mat->data[Matrix4::kScaleX];
float m01 = mat->data[Matrix4::kSkewY];
float m10 = mat->data[Matrix4::kSkewX];
float m11 = mat->data[Matrix4::kScaleY];
float scaleX = sqrtf(m00 * m00 + m01 * m01);
float scaleY = sqrtf(m10 * m10 + m11 * m11);
inverseScaleX = (scaleX != 0) ? (inverseScaleX / scaleX) : 0;
inverseScaleY = (scaleY != 0) ? (inverseScaleY / scaleY) : 0;
if (inverseScaleX != 1.0f || inverseScaleY != 1.0f) {
scaled = true;
}
}
}
getAlphaAndMode(paint, &alpha, &mode);
mCaches.enableScissor();
setupDraw();
setupDrawNoTexture();
if (isAA) {
setupDrawAA();
}
setupDrawColor(paint->getColor(), alpha);
setupDrawColorFilter();
setupDrawShader();
setupDrawBlending(isAA, mode);
setupDrawProgram();
setupDrawModelViewIdentity(true);
setupDrawColorUniforms();
setupDrawColorFilterUniforms();
setupDrawShaderIdentityUniforms();
if (isHairLine) {
// Set a real stroke width to be used in quad construction
halfStrokeWidth = isAA? 1 : .5;
} else if (isAA && !scaled) {
// Expand boundary to enable AA calculations on the quad border
halfStrokeWidth += .5f;
}
int widthSlot;
int lengthSlot;
Vertex lines[verticesCount];
Vertex* vertices = &lines[0];
AAVertex wLines[verticesCount];
AAVertex* aaVertices = &wLines[0];
if (CC_UNLIKELY(!isAA)) {
setupDrawVertices(vertices);
} else {
void* widthCoords = ((GLbyte*) aaVertices) + gVertexAAWidthOffset;
void* lengthCoords = ((GLbyte*) aaVertices) + gVertexAALengthOffset;
// innerProportion is the ratio of the inner (non-AA) part of the line to the total
// AA stroke width (the base stroke width expanded by a half pixel on either side).
// This value is used in the fragment shader to determine how to fill fragments.
// We will need to calculate the actual width proportion on each segment for
// scaled non-hairlines, since the boundary proportion may differ per-axis when scaled.
float boundaryWidthProportion = .5 - 1 / (2 * halfStrokeWidth);
setupDrawAALine((void*) aaVertices, widthCoords, lengthCoords,
boundaryWidthProportion, widthSlot, lengthSlot);
}
AAVertex* prevAAVertex = NULL;
Vertex* prevVertex = NULL;
int boundaryLengthSlot = -1;
int boundaryWidthSlot = -1;
for (int i = 0; i < count; i += 4) {
// a = start point, b = end point
vec2 a(points[i], points[i + 1]);
vec2 b(points[i + 2], points[i + 3]);
float length = 0;
float boundaryLengthProportion = 0;
float boundaryWidthProportion = 0;
// Find the normal to the line
vec2 n = (b - a).copyNormalized() * halfStrokeWidth;
float x = n.x;
n.x = -n.y;
n.y = x;
if (isHairLine) {
if (isAA) {
float wideningFactor;
if (fabs(n.x) >= fabs(n.y)) {
wideningFactor = fabs(1.0f / n.x);
} else {
wideningFactor = fabs(1.0f / n.y);
}
n *= wideningFactor;
}
if (scaled) {
n.x *= inverseScaleX;
n.y *= inverseScaleY;
}
} else if (scaled) {
// Extend n by .5 pixel on each side, post-transform
vec2 extendedN = n.copyNormalized();
extendedN /= 2;
extendedN.x *= inverseScaleX;
extendedN.y *= inverseScaleY;
float extendedNLength = extendedN.length();
// We need to set this value on the shader prior to drawing
boundaryWidthProportion = .5 - extendedNLength / (halfStrokeWidth + extendedNLength);
n += extendedN;
}
// aa lines expand the endpoint vertices to encompass the AA boundary
if (isAA) {
vec2 abVector = (b - a);
length = abVector.length();
abVector.normalize();
if (scaled) {
abVector.x *= inverseScaleX;
abVector.y *= inverseScaleY;
float abLength = abVector.length();
boundaryLengthProportion = .5 - abLength / (length + abLength);
} else {
boundaryLengthProportion = .5 - .5 / (length + 1);
}
abVector /= 2;
a -= abVector;
b += abVector;
}
// Four corners of the rectangle defining a thick line
vec2 p1 = a - n;
vec2 p2 = a + n;
vec2 p3 = b + n;
vec2 p4 = b - n;
const float left = fmin(p1.x, fmin(p2.x, fmin(p3.x, p4.x)));
const float right = fmax(p1.x, fmax(p2.x, fmax(p3.x, p4.x)));
const float top = fmin(p1.y, fmin(p2.y, fmin(p3.y, p4.y)));
const float bottom = fmax(p1.y, fmax(p2.y, fmax(p3.y, p4.y)));
if (!quickRejectNoScissor(left, top, right, bottom)) {
if (!isAA) {
if (prevVertex != NULL) {
// Issue two repeat vertices to create degenerate triangles to bridge
// between the previous line and the new one. This is necessary because
// we are creating a single triangle_strip which will contain
// potentially discontinuous line segments.
Vertex::set(vertices++, prevVertex->position[0], prevVertex->position[1]);
Vertex::set(vertices++, p1.x, p1.y);
generatedVerticesCount += 2;
}
Vertex::set(vertices++, p1.x, p1.y);
Vertex::set(vertices++, p2.x, p2.y);
Vertex::set(vertices++, p4.x, p4.y);
Vertex::set(vertices++, p3.x, p3.y);
prevVertex = vertices - 1;
generatedVerticesCount += 4;
} else {
if (!isHairLine && scaled) {
// Must set width proportions per-segment for scaled non-hairlines to use the
// correct AA boundary dimensions
if (boundaryWidthSlot < 0) {
boundaryWidthSlot =
mCaches.currentProgram->getUniform("boundaryWidth");
}
glUniform1f(boundaryWidthSlot, boundaryWidthProportion);
}
if (boundaryLengthSlot < 0) {
boundaryLengthSlot = mCaches.currentProgram->getUniform("boundaryLength");
}
glUniform1f(boundaryLengthSlot, boundaryLengthProportion);
if (prevAAVertex != NULL) {
// Issue two repeat vertices to create degenerate triangles to bridge
// between the previous line and the new one. This is necessary because
// we are creating a single triangle_strip which will contain
// potentially discontinuous line segments.
AAVertex::set(aaVertices++,prevAAVertex->position[0],
prevAAVertex->position[1], prevAAVertex->width, prevAAVertex->length);
AAVertex::set(aaVertices++, p4.x, p4.y, 1, 1);
generatedVerticesCount += 2;
}
AAVertex::set(aaVertices++, p4.x, p4.y, 1, 1);
AAVertex::set(aaVertices++, p1.x, p1.y, 1, 0);
AAVertex::set(aaVertices++, p3.x, p3.y, 0, 1);
AAVertex::set(aaVertices++, p2.x, p2.y, 0, 0);
prevAAVertex = aaVertices - 1;
generatedVerticesCount += 4;
}
dirtyLayer(a.x == b.x ? left - 1 : left, a.y == b.y ? top - 1 : top,
a.x == b.x ? right: right, a.y == b.y ? bottom: bottom,
*mSnapshot->transform);
}
}
if (generatedVerticesCount > 0) {
glDrawArrays(GL_TRIANGLE_STRIP, 0, generatedVerticesCount);
}
if (isAA) {
finishDrawAALine(widthSlot, lengthSlot);
}
return DrawGlInfo::kStatusDrew;
}
status_t OpenGLRenderer::drawPoints(float* points, int count, SkPaint* paint) {
if (mSnapshot->isIgnored()) return DrawGlInfo::kStatusDone;
// TODO: The paint's cap style defines whether the points are square or circular
// TODO: Handle AA for round points
// A stroke width of 0 has a special meaning in Skia:
// it draws an unscaled 1px point
float strokeWidth = paint->getStrokeWidth();
const bool isHairLine = paint->getStrokeWidth() == 0.0f;
if (isHairLine) {
// Now that we know it's hairline, we can set the effective width, to be used later
strokeWidth = 1.0f;
}
const float halfWidth = strokeWidth / 2;
int alpha;
SkXfermode::Mode mode;
getAlphaAndMode(paint, &alpha, &mode);
int verticesCount = count >> 1;
int generatedVerticesCount = 0;
TextureVertex pointsData[verticesCount];
TextureVertex* vertex = &pointsData[0];
// TODO: We should optimize this method to not generate vertices for points
// that lie outside of the clip.
mCaches.enableScissor();
setupDraw();
setupDrawNoTexture();
setupDrawPoint(strokeWidth);
setupDrawColor(paint->getColor(), alpha);
setupDrawColorFilter();
setupDrawShader();
setupDrawBlending(mode);
setupDrawProgram();
setupDrawModelViewIdentity(true);
setupDrawColorUniforms();
setupDrawColorFilterUniforms();
setupDrawPointUniforms();
setupDrawShaderIdentityUniforms();
setupDrawMesh(vertex);
for (int i = 0; i < count; i += 2) {
TextureVertex::set(vertex++, points[i], points[i + 1], 0.0f, 0.0f);
generatedVerticesCount++;
float left = points[i] - halfWidth;
float right = points[i] + halfWidth;
float top = points[i + 1] - halfWidth;
float bottom = points [i + 1] + halfWidth;
dirtyLayer(left, top, right, bottom, *mSnapshot->transform);
}
glDrawArrays(GL_POINTS, 0, generatedVerticesCount);
return DrawGlInfo::kStatusDrew;
}
status_t OpenGLRenderer::drawColor(int color, SkXfermode::Mode mode) {
// No need to check against the clip, we fill the clip region
if (mSnapshot->isIgnored()) return DrawGlInfo::kStatusDone;
Rect& clip(*mSnapshot->clipRect);
clip.snapToPixelBoundaries();
drawColorRect(clip.left, clip.top, clip.right, clip.bottom, color, mode, true);
return DrawGlInfo::kStatusDrew;
}
status_t OpenGLRenderer::drawShape(float left, float top, const PathTexture* texture,
SkPaint* paint) {
if (!texture) return DrawGlInfo::kStatusDone;
const AutoTexture autoCleanup(texture);
const float x = left + texture->left - texture->offset;
const float y = top + texture->top - texture->offset;
drawPathTexture(texture, x, y, paint);
return DrawGlInfo::kStatusDrew;
}
status_t OpenGLRenderer::drawRoundRect(float left, float top, float right, float bottom,
float rx, float ry, SkPaint* p) {
if (mSnapshot->isIgnored() || quickRejectPreStroke(left, top, right, bottom, p)) {
return DrawGlInfo::kStatusDone;
}
if (p->getPathEffect() != 0) {
mCaches.activeTexture(0);
const PathTexture* texture = mCaches.roundRectShapeCache.getRoundRect(
right - left, bottom - top, rx, ry, p);
return drawShape(left, top, texture, p);
}
SkPath path;
SkRect rect = SkRect::MakeLTRB(left, top, right, bottom);
if (p->getStyle() == SkPaint::kStrokeAndFill_Style) {
float outset = p->getStrokeWidth() / 2;
rect.outset(outset, outset);
rx += outset;
ry += outset;
}
path.addRoundRect(rect, rx, ry);
drawConvexPath(path, p);
return DrawGlInfo::kStatusDrew;
}
status_t OpenGLRenderer::drawCircle(float x, float y, float radius, SkPaint* p) {
if (mSnapshot->isIgnored() || quickRejectPreStroke(x - radius, y - radius,
x + radius, y + radius, p)) {
return DrawGlInfo::kStatusDone;
}
if (p->getPathEffect() != 0) {
mCaches.activeTexture(0);
const PathTexture* texture = mCaches.circleShapeCache.getCircle(radius, p);
return drawShape(x - radius, y - radius, texture, p);
}
SkPath path;
if (p->getStyle() == SkPaint::kStrokeAndFill_Style) {
path.addCircle(x, y, radius + p->getStrokeWidth() / 2);
} else {
path.addCircle(x, y, radius);
}
drawConvexPath(path, p);
return DrawGlInfo::kStatusDrew;
}
status_t OpenGLRenderer::drawOval(float left, float top, float right, float bottom,
SkPaint* p) {
if (mSnapshot->isIgnored() || quickRejectPreStroke(left, top, right, bottom, p)) {
return DrawGlInfo::kStatusDone;
}
if (p->getPathEffect() != 0) {
mCaches.activeTexture(0);
const PathTexture* texture = mCaches.ovalShapeCache.getOval(right - left, bottom - top, p);
return drawShape(left, top, texture, p);
}
SkPath path;
SkRect rect = SkRect::MakeLTRB(left, top, right, bottom);
if (p->getStyle() == SkPaint::kStrokeAndFill_Style) {
rect.outset(p->getStrokeWidth() / 2, p->getStrokeWidth() / 2);
}
path.addOval(rect);
drawConvexPath(path, p);
return DrawGlInfo::kStatusDrew;
}
status_t OpenGLRenderer::drawArc(float left, float top, float right, float bottom,
float startAngle, float sweepAngle, bool useCenter, SkPaint* p) {
if (mSnapshot->isIgnored() || quickRejectPreStroke(left, top, right, bottom, p)) {
return DrawGlInfo::kStatusDone;
}
if (fabs(sweepAngle) >= 360.0f) {
return drawOval(left, top, right, bottom, p);
}
// TODO: support fills (accounting for concavity if useCenter && sweepAngle > 180)
if (p->getStyle() != SkPaint::kStroke_Style || p->getPathEffect() != 0 || p->getStrokeCap() != SkPaint::kButt_Cap || useCenter) {
mCaches.activeTexture(0);
const PathTexture* texture = mCaches.arcShapeCache.getArc(right - left, bottom - top,
startAngle, sweepAngle, useCenter, p);
return drawShape(left, top, texture, p);
}
SkRect rect = SkRect::MakeLTRB(left, top, right, bottom);
if (p->getStyle() == SkPaint::kStrokeAndFill_Style) {
rect.outset(p->getStrokeWidth() / 2, p->getStrokeWidth() / 2);
}
SkPath path;
if (useCenter) {
path.moveTo(rect.centerX(), rect.centerY());
}
path.arcTo(rect, startAngle, sweepAngle, !useCenter);
if (useCenter) {
path.close();
}
drawConvexPath(path, p);
return DrawGlInfo::kStatusDrew;
}
// See SkPaintDefaults.h
#define SkPaintDefaults_MiterLimit SkIntToScalar(4)
status_t OpenGLRenderer::drawRect(float left, float top, float right, float bottom, SkPaint* p) {
if (mSnapshot->isIgnored() || quickRejectPreStroke(left, top, right, bottom, p)) {
return DrawGlInfo::kStatusDone;
}
if (p->getStyle() != SkPaint::kFill_Style) {
// only fill style is supported by drawConvexPath, since others have to handle joins
if (p->getPathEffect() != 0 || p->getStrokeJoin() != SkPaint::kMiter_Join ||
p->getStrokeMiter() != SkPaintDefaults_MiterLimit) {
mCaches.activeTexture(0);
const PathTexture* texture =
mCaches.rectShapeCache.getRect(right - left, bottom - top, p);
return drawShape(left, top, texture, p);
}
SkPath path;
SkRect rect = SkRect::MakeLTRB(left, top, right, bottom);
if (p->getStyle() == SkPaint::kStrokeAndFill_Style) {
rect.outset(p->getStrokeWidth() / 2, p->getStrokeWidth() / 2);
}
path.addRect(rect);
drawConvexPath(path, p);
return DrawGlInfo::kStatusDrew;
}
if (p->isAntiAlias() && !mSnapshot->transform->isSimple()) {
SkPath path;
path.addRect(left, top, right, bottom);
drawConvexPath(path, p);
} else {
drawColorRect(left, top, right, bottom, p->getColor(), getXfermode(p->getXfermode()));
}
return DrawGlInfo::kStatusDrew;
}
void OpenGLRenderer::drawTextShadow(SkPaint* paint, const char* text, int bytesCount, int count,
const float* positions, FontRenderer& fontRenderer, int alpha, SkXfermode::Mode mode,
float x, float y) {
mCaches.activeTexture(0);
// NOTE: The drop shadow will not perform gamma correction
// if shader-based correction is enabled
mCaches.dropShadowCache.setFontRenderer(fontRenderer);
const ShadowTexture* shadow = mCaches.dropShadowCache.get(
paint, text, bytesCount, count, mShadowRadius, positions);
const AutoTexture autoCleanup(shadow);
const float sx = x - shadow->left + mShadowDx;
const float sy = y - shadow->top + mShadowDy;
const int shadowAlpha = ((mShadowColor >> 24) & 0xFF) * mSnapshot->alpha;
int shadowColor = mShadowColor;
if (mShader) {
shadowColor = 0xffffffff;
}
setupDraw();
setupDrawWithTexture(true);
setupDrawAlpha8Color(shadowColor, shadowAlpha < 255 ? shadowAlpha : alpha);
setupDrawColorFilter();
setupDrawShader();
setupDrawBlending(true, mode);
setupDrawProgram();
setupDrawModelView(sx, sy, sx + shadow->width, sy + shadow->height);
setupDrawTexture(shadow->id);
setupDrawPureColorUniforms();
setupDrawColorFilterUniforms();
setupDrawShaderUniforms();
setupDrawMesh(NULL, (GLvoid*) gMeshTextureOffset);
glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount);
}
status_t OpenGLRenderer::drawPosText(const char* text, int bytesCount, int count,
const float* positions, SkPaint* paint) {
if (text == NULL || count == 0 || mSnapshot->isIgnored() ||
(paint->getAlpha() * mSnapshot->alpha == 0 && paint->getXfermode() == NULL)) {
return DrawGlInfo::kStatusDone;
}
// NOTE: Skia does not support perspective transform on drawPosText yet
if (!mSnapshot->transform->isSimple()) {
return DrawGlInfo::kStatusDone;
}
float x = 0.0f;
float y = 0.0f;
const bool pureTranslate = mSnapshot->transform->isPureTranslate();
if (pureTranslate) {
x = (int) floorf(x + mSnapshot->transform->getTranslateX() + 0.5f);
y = (int) floorf(y + mSnapshot->transform->getTranslateY() + 0.5f);
}
FontRenderer& fontRenderer = mCaches.fontRenderer->getFontRenderer(paint);
fontRenderer.setFont(paint, SkTypeface::UniqueID(paint->getTypeface()),
paint->getTextSize());
int alpha;
SkXfermode::Mode mode;
getAlphaAndMode(paint, &alpha, &mode);
if (CC_UNLIKELY(mHasShadow)) {
drawTextShadow(paint, text, bytesCount, count, positions, fontRenderer, alpha, mode,
0.0f, 0.0f);
}
// Pick the appropriate texture filtering
bool linearFilter = mSnapshot->transform->changesBounds();
if (pureTranslate && !linearFilter) {
linearFilter = fabs(y - (int) y) > 0.0f || fabs(x - (int) x) > 0.0f;
}
mCaches.activeTexture(0);
setupDraw();
setupDrawTextGamma(paint);
setupDrawDirtyRegionsDisabled();
setupDrawWithTexture(true);
setupDrawAlpha8Color(paint->getColor(), alpha);
setupDrawColorFilter();
setupDrawShader();
setupDrawBlending(true, mode);
setupDrawProgram();
setupDrawModelView(x, y, x, y, pureTranslate, true);
setupDrawTexture(fontRenderer.getTexture(linearFilter));
setupDrawPureColorUniforms();
setupDrawColorFilterUniforms();
setupDrawShaderUniforms(pureTranslate);
setupDrawTextGammaUniforms();
const Rect* clip = pureTranslate ? mSnapshot->clipRect : &mSnapshot->getLocalClip();
Rect bounds(FLT_MAX / 2.0f, FLT_MAX / 2.0f, FLT_MIN / 2.0f, FLT_MIN / 2.0f);
const bool hasActiveLayer = hasLayer();
if (fontRenderer.renderPosText(paint, clip, text, 0, bytesCount, count, x, y,
positions, hasActiveLayer ? &bounds : NULL)) {
if (hasActiveLayer) {
if (!pureTranslate) {
mSnapshot->transform->mapRect(bounds);
}
dirtyLayerUnchecked(bounds, getRegion());
}
}
return DrawGlInfo::kStatusDrew;
}
status_t OpenGLRenderer::drawText(const char* text, int bytesCount, int count,
float x, float y, const float* positions, SkPaint* paint, float length) {
if (text == NULL || count == 0 || mSnapshot->isIgnored() ||
(paint->getAlpha() * mSnapshot->alpha == 0 && paint->getXfermode() == NULL)) {
return DrawGlInfo::kStatusDone;
}
if (length < 0.0f) length = paint->measureText(text, bytesCount);
switch (paint->getTextAlign()) {
case SkPaint::kCenter_Align:
x -= length / 2.0f;
break;
case SkPaint::kRight_Align:
x -= length;
break;
default:
break;
}
SkPaint::FontMetrics metrics;
paint->getFontMetrics(&metrics, 0.0f);
if (quickReject(x, y + metrics.fTop, x + length, y + metrics.fBottom)) {
return DrawGlInfo::kStatusDone;
}
const float oldX = x;
const float oldY = y;
const bool pureTranslate = mSnapshot->transform->isPureTranslate();
if (CC_LIKELY(pureTranslate)) {
x = (int) floorf(x + mSnapshot->transform->getTranslateX() + 0.5f);
y = (int) floorf(y + mSnapshot->transform->getTranslateY() + 0.5f);
}
#if DEBUG_GLYPHS
ALOGD("OpenGLRenderer drawText() with FontID=%d",
SkTypeface::UniqueID(paint->getTypeface()));
#endif
FontRenderer& fontRenderer = mCaches.fontRenderer->getFontRenderer(paint);
fontRenderer.setFont(paint, SkTypeface::UniqueID(paint->getTypeface()),
paint->getTextSize());
int alpha;
SkXfermode::Mode mode;
getAlphaAndMode(paint, &alpha, &mode);
if (CC_UNLIKELY(mHasShadow)) {
drawTextShadow(paint, text, bytesCount, count, positions, fontRenderer, alpha, mode,
oldX, oldY);
}
// Pick the appropriate texture filtering
bool linearFilter = mSnapshot->transform->changesBounds();
if (pureTranslate && !linearFilter) {
linearFilter = fabs(y - (int) y) > 0.0f || fabs(x - (int) x) > 0.0f;
}
// The font renderer will always use texture unit 0
mCaches.activeTexture(0);
setupDraw();
setupDrawTextGamma(paint);
setupDrawDirtyRegionsDisabled();
setupDrawWithTexture(true);
setupDrawAlpha8Color(paint->getColor(), alpha);
setupDrawColorFilter();
setupDrawShader();
setupDrawBlending(true, mode);
setupDrawProgram();
setupDrawModelView(x, y, x, y, pureTranslate, true);
// See comment above; the font renderer must use texture unit 0
// assert(mTextureUnit == 0)
setupDrawTexture(fontRenderer.getTexture(linearFilter));
setupDrawPureColorUniforms();
setupDrawColorFilterUniforms();
setupDrawShaderUniforms(pureTranslate);
setupDrawTextGammaUniforms();
const Rect* clip = pureTranslate ? mSnapshot->clipRect :
(mSnapshot->hasPerspectiveTransform() ? NULL : &mSnapshot->getLocalClip());
Rect bounds(FLT_MAX / 2.0f, FLT_MAX / 2.0f, FLT_MIN / 2.0f, FLT_MIN / 2.0f);
const bool hasActiveLayer = hasLayer();
bool status;
if (CC_UNLIKELY(paint->getTextAlign() != SkPaint::kLeft_Align)) {
SkPaint paintCopy(*paint);
paintCopy.setTextAlign(SkPaint::kLeft_Align);
status = fontRenderer.renderPosText(&paintCopy, clip, text, 0, bytesCount, count, x, y,
positions, hasActiveLayer ? &bounds : NULL);
} else {
status = fontRenderer.renderPosText(paint, clip, text, 0, bytesCount, count, x, y,
positions, hasActiveLayer ? &bounds : NULL);
}
if (status && hasActiveLayer) {
if (!pureTranslate) {
mSnapshot->transform->mapRect(bounds);
}
dirtyLayerUnchecked(bounds, getRegion());
}
drawTextDecorations(text, bytesCount, length, oldX, oldY, paint);
return DrawGlInfo::kStatusDrew;
}
status_t OpenGLRenderer::drawTextOnPath(const char* text, int bytesCount, int count, SkPath* path,
float hOffset, float vOffset, SkPaint* paint) {
if (text == NULL || count == 0 || mSnapshot->isIgnored() ||
(paint->getAlpha() == 0 && paint->getXfermode() == NULL)) {
return DrawGlInfo::kStatusDone;
}
FontRenderer& fontRenderer = mCaches.fontRenderer->getFontRenderer(paint);
fontRenderer.setFont(paint, SkTypeface::UniqueID(paint->getTypeface()),
paint->getTextSize());
int alpha;
SkXfermode::Mode mode;
getAlphaAndMode(paint, &alpha, &mode);
mCaches.activeTexture(0);
setupDraw();
setupDrawTextGamma(paint);
setupDrawDirtyRegionsDisabled();
setupDrawWithTexture(true);
setupDrawAlpha8Color(paint->getColor(), alpha);
setupDrawColorFilter();
setupDrawShader();
setupDrawBlending(true, mode);
setupDrawProgram();
setupDrawModelView(0.0f, 0.0f, 0.0f, 0.0f, false, true);
setupDrawTexture(fontRenderer.getTexture(true));
setupDrawPureColorUniforms();
setupDrawColorFilterUniforms();
setupDrawShaderUniforms(false);
setupDrawTextGammaUniforms();
const Rect* clip = &mSnapshot->getLocalClip();
Rect bounds(FLT_MAX / 2.0f, FLT_MAX / 2.0f, FLT_MIN / 2.0f, FLT_MIN / 2.0f);
const bool hasActiveLayer = hasLayer();
if (fontRenderer.renderTextOnPath(paint, clip, text, 0, bytesCount, count, path,
hOffset, vOffset, hasActiveLayer ? &bounds : NULL)) {
if (hasActiveLayer) {
mSnapshot->transform->mapRect(bounds);
dirtyLayerUnchecked(bounds, getRegion());
}
}
return DrawGlInfo::kStatusDrew;
}
status_t OpenGLRenderer::drawPath(SkPath* path, SkPaint* paint) {
if (mSnapshot->isIgnored()) return DrawGlInfo::kStatusDone;
mCaches.activeTexture(0);
// TODO: Perform early clip test before we rasterize the path
const PathTexture* texture = mCaches.pathCache.get(path, paint);
if (!texture) return DrawGlInfo::kStatusDone;
const AutoTexture autoCleanup(texture);
const float x = texture->left - texture->offset;
const float y = texture->top - texture->offset;
drawPathTexture(texture, x, y, paint);
return DrawGlInfo::kStatusDrew;
}
status_t OpenGLRenderer::drawLayer(Layer* layer, float x, float y, SkPaint* paint) {
if (!layer) {
return DrawGlInfo::kStatusDone;
}
mat4* transform = NULL;
if (layer->isTextureLayer()) {
transform = &layer->getTransform();
if (!transform->isIdentity()) {
save(0);
mSnapshot->transform->multiply(*transform);
}
}
Rect transformed;
Rect clip;
const bool rejected = quickRejectNoScissor(x, y,
x + layer->layer.getWidth(), y + layer->layer.getHeight(), transformed, clip);
if (rejected) {
if (transform && !transform->isIdentity()) {
restore();
}
return DrawGlInfo::kStatusDone;
}
bool debugLayerUpdate = false;
if (updateLayer(layer, true)) {
debugLayerUpdate = mCaches.debugLayersUpdates;
}
mCaches.setScissorEnabled(mScissorOptimizationDisabled || !clip.contains(transformed));
mCaches.activeTexture(0);
if (CC_LIKELY(!layer->region.isEmpty())) {
SkiaColorFilter* oldFilter = mColorFilter;
mColorFilter = layer->getColorFilter();
if (layer->region.isRect()) {
composeLayerRect(layer, layer->regionRect);
} else if (layer->mesh) {
const float a = layer->getAlpha() / 255.0f;
setupDraw();
setupDrawWithTexture();
setupDrawColor(a, a, a, a);
setupDrawColorFilter();
setupDrawBlending(layer->isBlend() || a < 1.0f, layer->getMode(), false);
setupDrawProgram();
setupDrawPureColorUniforms();
setupDrawColorFilterUniforms();
setupDrawTexture(layer->getTexture());
if (CC_LIKELY(mSnapshot->transform->isPureTranslate())) {
int tx = (int) floorf(x + mSnapshot->transform->getTranslateX() + 0.5f);
int ty = (int) floorf(y + mSnapshot->transform->getTranslateY() + 0.5f);
layer->setFilter(GL_NEAREST);
setupDrawModelViewTranslate(tx, ty,
tx + layer->layer.getWidth(), ty + layer->layer.getHeight(), true);
} else {
layer->setFilter(GL_LINEAR);
setupDrawModelViewTranslate(x, y,
x + layer->layer.getWidth(), y + layer->layer.getHeight());
}
setupDrawMesh(&layer->mesh[0].position[0], &layer->mesh[0].texture[0]);
glDrawElements(GL_TRIANGLES, layer->meshElementCount,
GL_UNSIGNED_SHORT, layer->meshIndices);
finishDrawTexture();
#if DEBUG_LAYERS_AS_REGIONS
drawRegionRects(layer->region);
#endif
}
mColorFilter = oldFilter;
if (debugLayerUpdate) {
drawColorRect(x, y, x + layer->layer.getWidth(), y + layer->layer.getHeight(),
0x7f00ff00, SkXfermode::kSrcOver_Mode);
}
}
if (transform && !transform->isIdentity()) {
restore();
}
return DrawGlInfo::kStatusDrew;
}
///////////////////////////////////////////////////////////////////////////////
// Shaders
///////////////////////////////////////////////////////////////////////////////
void OpenGLRenderer::resetShader() {
mShader = NULL;
}
void OpenGLRenderer::setupShader(SkiaShader* shader) {
mShader = shader;
if (mShader) {
mShader->set(&mCaches.textureCache, &mCaches.gradientCache);
}
}
///////////////////////////////////////////////////////////////////////////////
// Color filters
///////////////////////////////////////////////////////////////////////////////
void OpenGLRenderer::resetColorFilter() {
mColorFilter = NULL;
}
void OpenGLRenderer::setupColorFilter(SkiaColorFilter* filter) {
mColorFilter = filter;
}
///////////////////////////////////////////////////////////////////////////////
// Drop shadow
///////////////////////////////////////////////////////////////////////////////
void OpenGLRenderer::resetShadow() {
mHasShadow = false;
}
void OpenGLRenderer::setupShadow(float radius, float dx, float dy, int color) {
mHasShadow = true;
mShadowRadius = radius;
mShadowDx = dx;
mShadowDy = dy;
mShadowColor = color;
}
///////////////////////////////////////////////////////////////////////////////
// Draw filters
///////////////////////////////////////////////////////////////////////////////
void OpenGLRenderer::resetPaintFilter() {
mHasDrawFilter = false;
}
void OpenGLRenderer::setupPaintFilter(int clearBits, int setBits) {
mHasDrawFilter = true;
mPaintFilterClearBits = clearBits & SkPaint::kAllFlags;
mPaintFilterSetBits = setBits & SkPaint::kAllFlags;
}
SkPaint* OpenGLRenderer::filterPaint(SkPaint* paint) {
if (CC_LIKELY(!mHasDrawFilter || !paint)) return paint;
uint32_t flags = paint->getFlags();
mFilteredPaint = *paint;
mFilteredPaint.setFlags((flags & ~mPaintFilterClearBits) | mPaintFilterSetBits);
return &mFilteredPaint;
}
///////////////////////////////////////////////////////////////////////////////
// Drawing implementation
///////////////////////////////////////////////////////////////////////////////
void OpenGLRenderer::drawPathTexture(const PathTexture* texture,
float x, float y, SkPaint* paint) {
if (quickReject(x, y, x + texture->width, y + texture->height)) {
return;
}
int alpha;
SkXfermode::Mode mode;
getAlphaAndMode(paint, &alpha, &mode);
setupDraw();
setupDrawWithTexture(true);
setupDrawAlpha8Color(paint->getColor(), alpha);
setupDrawColorFilter();
setupDrawShader();
setupDrawBlending(true, mode);
setupDrawProgram();
setupDrawModelView(x, y, x + texture->width, y + texture->height);
setupDrawTexture(texture->id);
setupDrawPureColorUniforms();
setupDrawColorFilterUniforms();
setupDrawShaderUniforms();
setupDrawMesh(NULL, (GLvoid*) gMeshTextureOffset);
glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount);
finishDrawTexture();
}
// Same values used by Skia
#define kStdStrikeThru_Offset (-6.0f / 21.0f)
#define kStdUnderline_Offset (1.0f / 9.0f)
#define kStdUnderline_Thickness (1.0f / 18.0f)
void OpenGLRenderer::drawTextDecorations(const char* text, int bytesCount, float length,
float x, float y, SkPaint* paint) {
// Handle underline and strike-through
uint32_t flags = paint->getFlags();
if (flags & (SkPaint::kUnderlineText_Flag | SkPaint::kStrikeThruText_Flag)) {
SkPaint paintCopy(*paint);
float underlineWidth = length;
// If length is > 0.0f, we already measured the text for the text alignment
if (length <= 0.0f) {
underlineWidth = paintCopy.measureText(text, bytesCount);
}
if (CC_LIKELY(underlineWidth > 0.0f)) {
const float textSize = paintCopy.getTextSize();
const float strokeWidth = fmax(textSize * kStdUnderline_Thickness, 1.0f);
const float left = x;
float top = 0.0f;
int linesCount = 0;
if (flags & SkPaint::kUnderlineText_Flag) linesCount++;
if (flags & SkPaint::kStrikeThruText_Flag) linesCount++;
const int pointsCount = 4 * linesCount;
float points[pointsCount];
int currentPoint = 0;
if (flags & SkPaint::kUnderlineText_Flag) {
top = y + textSize * kStdUnderline_Offset;
points[currentPoint++] = left;
points[currentPoint++] = top;
points[currentPoint++] = left + underlineWidth;
points[currentPoint++] = top;
}
if (flags & SkPaint::kStrikeThruText_Flag) {
top = y + textSize * kStdStrikeThru_Offset;
points[currentPoint++] = left;
points[currentPoint++] = top;
points[currentPoint++] = left + underlineWidth;
points[currentPoint++] = top;
}
paintCopy.setStrokeWidth(strokeWidth);
drawLines(&points[0], pointsCount, &paintCopy);
}
}
}
void OpenGLRenderer::drawColorRect(float left, float top, float right, float bottom,
int color, SkXfermode::Mode mode, bool ignoreTransform) {
// If a shader is set, preserve only the alpha
if (mShader) {
color |= 0x00ffffff;
}
setupDraw();
setupDrawNoTexture();
setupDrawColor(color, ((color >> 24) & 0xFF) * mSnapshot->alpha);
setupDrawShader();
setupDrawColorFilter();
setupDrawBlending(mode);
setupDrawProgram();
setupDrawModelView(left, top, right, bottom, ignoreTransform);
setupDrawColorUniforms();
setupDrawShaderUniforms(ignoreTransform);
setupDrawColorFilterUniforms();
setupDrawSimpleMesh();
glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount);
}
void OpenGLRenderer::drawTextureRect(float left, float top, float right, float bottom,
Texture* texture, SkPaint* paint) {
int alpha;
SkXfermode::Mode mode;
getAlphaAndMode(paint, &alpha, &mode);
texture->setWrap(GL_CLAMP_TO_EDGE, true);
if (CC_LIKELY(mSnapshot->transform->isPureTranslate())) {
const float x = (int) floorf(left + mSnapshot->transform->getTranslateX() + 0.5f);
const float y = (int) floorf(top + mSnapshot->transform->getTranslateY() + 0.5f);
texture->setFilter(GL_NEAREST, true);
drawTextureMesh(x, y, x + texture->width, y + texture->height, texture->id,
alpha / 255.0f, mode, texture->blend, (GLvoid*) NULL,
(GLvoid*) gMeshTextureOffset, GL_TRIANGLE_STRIP, gMeshCount, false, true);
} else {
texture->setFilter(FILTER(paint), true);
drawTextureMesh(left, top, right, bottom, texture->id, alpha / 255.0f, mode,
texture->blend, (GLvoid*) NULL, (GLvoid*) gMeshTextureOffset,
GL_TRIANGLE_STRIP, gMeshCount);
}
}
void OpenGLRenderer::drawTextureRect(float left, float top, float right, float bottom,
GLuint texture, float alpha, SkXfermode::Mode mode, bool blend) {
drawTextureMesh(left, top, right, bottom, texture, alpha, mode, blend,
(GLvoid*) NULL, (GLvoid*) gMeshTextureOffset, GL_TRIANGLE_STRIP, gMeshCount);
}
void OpenGLRenderer::drawTextureMesh(float left, float top, float right, float bottom,
GLuint texture, float alpha, SkXfermode::Mode mode, bool blend,
GLvoid* vertices, GLvoid* texCoords, GLenum drawMode, GLsizei elementsCount,
bool swapSrcDst, bool ignoreTransform, GLuint vbo, bool ignoreScale, bool dirty) {
setupDraw();
setupDrawWithTexture();
setupDrawColor(alpha, alpha, alpha, alpha);
setupDrawColorFilter();
setupDrawBlending(blend, mode, swapSrcDst);
setupDrawProgram();
if (!dirty) {
setupDrawDirtyRegionsDisabled();
}
if (!ignoreScale) {
setupDrawModelView(left, top, right, bottom, ignoreTransform);
} else {
setupDrawModelViewTranslate(left, top, right, bottom, ignoreTransform);
}
setupDrawPureColorUniforms();
setupDrawColorFilterUniforms();
setupDrawTexture(texture);
setupDrawMesh(vertices, texCoords, vbo);
glDrawArrays(drawMode, 0, elementsCount);
finishDrawTexture();
}
void OpenGLRenderer::chooseBlending(bool blend, SkXfermode::Mode mode,
ProgramDescription& description, bool swapSrcDst) {
blend = blend || mode != SkXfermode::kSrcOver_Mode;
if (blend) {
// These blend modes are not supported by OpenGL directly and have
// to be implemented using shaders. Since the shader will perform
// the blending, turn blending off here
// If the blend mode cannot be implemented using shaders, fall
// back to the default SrcOver blend mode instead
if (CC_UNLIKELY(mode > SkXfermode::kScreen_Mode)) {
if (CC_UNLIKELY(mCaches.extensions.hasFramebufferFetch())) {
description.framebufferMode = mode;
description.swapSrcDst = swapSrcDst;
if (mCaches.blend) {
glDisable(GL_BLEND);
mCaches.blend = false;
}
return;
} else {
mode = SkXfermode::kSrcOver_Mode;
}
}
if (!mCaches.blend) {
glEnable(GL_BLEND);
}
GLenum sourceMode = swapSrcDst ? gBlendsSwap[mode].src : gBlends[mode].src;
GLenum destMode = swapSrcDst ? gBlendsSwap[mode].dst : gBlends[mode].dst;
if (sourceMode != mCaches.lastSrcMode || destMode != mCaches.lastDstMode) {
glBlendFunc(sourceMode, destMode);
mCaches.lastSrcMode = sourceMode;
mCaches.lastDstMode = destMode;
}
} else if (mCaches.blend) {
glDisable(GL_BLEND);
}
mCaches.blend = blend;
}
bool OpenGLRenderer::useProgram(Program* program) {
if (!program->isInUse()) {
if (mCaches.currentProgram != NULL) mCaches.currentProgram->remove();
program->use();
mCaches.currentProgram = program;
return false;
}
return true;
}
void OpenGLRenderer::resetDrawTextureTexCoords(float u1, float v1, float u2, float v2) {
TextureVertex* v = &mMeshVertices[0];
TextureVertex::setUV(v++, u1, v1);
TextureVertex::setUV(v++, u2, v1);
TextureVertex::setUV(v++, u1, v2);
TextureVertex::setUV(v++, u2, v2);
}
void OpenGLRenderer::getAlphaAndMode(SkPaint* paint, int* alpha, SkXfermode::Mode* mode) {
getAlphaAndModeDirect(paint, alpha, mode);
*alpha *= mSnapshot->alpha;
}
}; // namespace uirenderer
}; // namespace android
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