165 lines
7.0 KiB
C++
165 lines
7.0 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_GRAPHICS_CANVAS_H
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#define ANDROID_GRAPHICS_CANVAS_H
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#include <cutils/compiler.h>
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#include <SkBitmap.h>
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#include <SkCanvas.h>
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#include <SkMatrix.h>
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namespace android {
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class ANDROID_API Canvas {
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public:
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virtual ~Canvas() {};
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static Canvas* create_canvas(const SkBitmap& bitmap);
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/**
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* Create a new Canvas object which delegates to an SkCanvas.
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*
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* @param skiaCanvas Must not be NULL. All drawing calls will be
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* delegated to this object. This function will call ref() on the
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* SkCanvas, and the returned Canvas will unref() it upon
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* destruction.
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* @return new Canvas object. Will not return NULL.
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*/
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static Canvas* create_canvas(SkCanvas* skiaCanvas);
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/**
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* Provides a Skia SkCanvas interface that acts as a proxy to this Canvas.
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* It is useful for testing and clients (e.g. Picture/Movie) that expect to
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* draw their contents into an SkCanvas.
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*
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* Further, the returned SkCanvas should NOT be unref'd and is valid until
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* this canvas is destroyed or a new bitmap is set.
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*/
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virtual SkCanvas* asSkCanvas() = 0;
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virtual void setBitmap(const SkBitmap& bitmap) = 0;
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virtual bool isOpaque() = 0;
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virtual int width() = 0;
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virtual int height() = 0;
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// ----------------------------------------------------------------------------
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// Canvas state operations
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// ----------------------------------------------------------------------------
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// Save (layer)
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virtual int getSaveCount() const = 0;
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virtual int save(SkCanvas::SaveFlags flags) = 0;
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virtual void restore() = 0;
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virtual void restoreToCount(int saveCount) = 0;
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virtual int saveLayer(float left, float top, float right, float bottom,
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const SkPaint* paint, SkCanvas::SaveFlags flags) = 0;
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virtual int saveLayerAlpha(float left, float top, float right, float bottom,
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int alpha, SkCanvas::SaveFlags flags) = 0;
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// Matrix
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virtual void getMatrix(SkMatrix* outMatrix) const = 0;
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virtual void setMatrix(const SkMatrix& matrix) = 0;
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virtual void concat(const SkMatrix& matrix) = 0;
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virtual void rotate(float degrees) = 0;
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virtual void scale(float sx, float sy) = 0;
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virtual void skew(float sx, float sy) = 0;
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virtual void translate(float dx, float dy) = 0;
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// clip
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virtual bool getClipBounds(SkRect* outRect) const = 0;
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virtual bool quickRejectRect(float left, float top, float right, float bottom) const = 0;
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virtual bool quickRejectPath(const SkPath& path) const = 0;
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virtual bool clipRect(float left, float top, float right, float bottom,
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SkRegion::Op op = SkRegion::kIntersect_Op) = 0;
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virtual bool clipPath(const SkPath* path, SkRegion::Op op) = 0;
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virtual bool clipRegion(const SkRegion* region, SkRegion::Op op) = 0;
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// filters
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virtual SkDrawFilter* getDrawFilter() = 0;
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virtual void setDrawFilter(SkDrawFilter* drawFilter) = 0;
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// ----------------------------------------------------------------------------
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// Canvas draw operations
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// ----------------------------------------------------------------------------
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virtual void drawColor(int color, SkXfermode::Mode mode) = 0;
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virtual void drawPaint(const SkPaint& paint) = 0;
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// Geometry
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virtual void drawPoint(float x, float y, const SkPaint& paint) = 0;
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virtual void drawPoints(const float* points, int count, const SkPaint& paint) = 0;
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virtual void drawLine(float startX, float startY, float stopX, float stopY,
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const SkPaint& paint) = 0;
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virtual void drawLines(const float* points, int count, const SkPaint& paint) = 0;
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virtual void drawRect(float left, float top, float right, float bottom,
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const SkPaint& paint) = 0;
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virtual void drawRoundRect(float left, float top, float right, float bottom,
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float rx, float ry, const SkPaint& paint) = 0;
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virtual void drawCircle(float x, float y, float radius, const SkPaint& paint) = 0;
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virtual void drawOval(float left, float top, float right, float bottom,
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const SkPaint& paint) = 0;
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virtual void drawArc(float left, float top, float right, float bottom,
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float startAngle, float sweepAngle, bool useCenter, const SkPaint& paint) = 0;
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virtual void drawPath(const SkPath& path, const SkPaint& paint) = 0;
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virtual void drawVertices(SkCanvas::VertexMode vertexMode, int vertexCount,
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const float* verts, const float* tex, const int* colors,
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const uint16_t* indices, int indexCount, const SkPaint& paint) = 0;
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// Bitmap-based
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virtual void drawBitmap(const SkBitmap& bitmap, float left, float top,
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const SkPaint* paint) = 0;
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virtual void drawBitmap(const SkBitmap& bitmap, const SkMatrix& matrix,
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const SkPaint* paint) = 0;
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virtual void drawBitmap(const SkBitmap& bitmap, float srcLeft, float srcTop,
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float srcRight, float srcBottom, float dstLeft, float dstTop,
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float dstRight, float dstBottom, const SkPaint* paint) = 0;
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virtual void drawBitmapMesh(const SkBitmap& bitmap, int meshWidth, int meshHeight,
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const float* vertices, const int* colors, const SkPaint* paint) = 0;
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// Text
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/**
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* drawText: count is of glyphs
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* totalAdvance is ignored in software renderering, used by hardware renderer for
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* text decorations (underlines, strikethroughs).
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*/
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virtual void drawText(const uint16_t* glyphs, const float* positions, int count,
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const SkPaint& paint, float x, float y,
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float boundsLeft, float boundsTop, float boundsRight, float boundsBottom,
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float totalAdvance) = 0;
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/** drawPosText: count is of UTF16 characters, posCount is floats (2 * glyphs) */
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virtual void drawPosText(const uint16_t* text, const float* positions, int count,
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int posCount, const SkPaint& paint) = 0;
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/** drawTextOnPath: count is of glyphs */
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virtual void drawTextOnPath(const uint16_t* glyphs, int count, const SkPath& path,
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float hOffset, float vOffset, const SkPaint& paint) = 0;
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/**
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* Specifies if the positions passed to ::drawText are absolute or relative
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* to the (x,y) value provided.
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*
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* If true the (x,y) values are ignored. Otherwise, those (x,y) values need
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* to be added to each glyph's position to get its absolute position.
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*/
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virtual bool drawTextAbsolutePos() const = 0;
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};
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}; // namespace android
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#endif // ANDROID_GRAPHICS_CANVAS_H
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