1532 lines
66 KiB
Java
1532 lines
66 KiB
Java
/*
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* Copyright (C) 2006 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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package android.graphics;
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import android.text.TextUtils;
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import android.text.SpannedString;
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import android.text.SpannableString;
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import android.text.GraphicsOperations;
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import javax.microedition.khronos.opengles.GL;
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/**
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* The Canvas class holds the "draw" calls. To draw something, you need
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* 4 basic components: A Bitmap to hold the pixels, a Canvas to host
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* the draw calls (writing into the bitmap), a drawing primitive (e.g. Rect,
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* Path, text, Bitmap), and a paint (to describe the colors and styles for the
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* drawing).
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*/
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public class Canvas {
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// assigned in constructors, freed in finalizer
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final int mNativeCanvas;
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/* Our native canvas can be either a raster, gl, or picture canvas.
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If we are raster, then mGL will be null, and mBitmap may or may not be
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present (our default constructor creates a raster canvas but no
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java-bitmap is). If we are a gl-based, then mBitmap will be null, and
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mGL will not be null. Thus both cannot be non-null, but its possible
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for both to be null.
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*/
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private Bitmap mBitmap; // if not null, mGL must be null
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private GL mGL; // if not null, mBitmap must be null
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// optional field set by the caller
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private DrawFilter mDrawFilter;
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// Used by native code
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@SuppressWarnings({"UnusedDeclaration"})
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private int mSurfaceFormat;
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@SuppressWarnings({"UnusedDeclaration"})
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private float mDensityScale = 1.0f;
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/**
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* Construct an empty raster canvas. Use setBitmap() to specify a bitmap to
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* draw into.
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*/
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public Canvas() {
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// 0 means no native bitmap
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mNativeCanvas = initRaster(0);
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}
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/**
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* Construct a canvas with the specified bitmap to draw into. The bitmap
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* must be mutable.
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*
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* @param bitmap Specifies a mutable bitmap for the canvas to draw into.
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*/
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public Canvas(Bitmap bitmap) {
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if (!bitmap.isMutable()) {
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throw new IllegalStateException(
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"Immutable bitmap passed to Canvas constructor");
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}
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throwIfRecycled(bitmap);
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mNativeCanvas = initRaster(bitmap.ni());
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mBitmap = bitmap;
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mDensityScale = bitmap.getDensityScale();
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if (mDensityScale == Bitmap.DENSITY_SCALE_UNKNOWN) mDensityScale = 1.0f;
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}
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/*package*/ Canvas(int nativeCanvas) {
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if (nativeCanvas == 0) {
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throw new IllegalStateException();
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}
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mNativeCanvas = nativeCanvas;
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}
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/**
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* Construct a canvas with the specified gl context. All drawing through
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* this canvas will be redirected to OpenGL. Note: some features may not
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* be supported in this mode (e.g. some GL implementations may not support
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* antialiasing or certain effects like ColorMatrix or certain Xfermodes).
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* However, no exception will be thrown in those cases.
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*/
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public Canvas(GL gl) {
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mNativeCanvas = initGL();
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mGL = gl;
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}
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/**
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* Return the GL object associated with this canvas, or null if it is not
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* backed by GL.
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*/
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public GL getGL() {
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return mGL;
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}
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/**
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* Call this to free up OpenGL resources that may be cached or allocated
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* on behalf of the Canvas. Any subsequent drawing with a GL-backed Canvas
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* will have to recreate those resources.
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*/
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public static native void freeGlCaches();
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/**
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* Specify a bitmap for the canvas to draw into.
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*
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* @param bitmap Specifies a mutable bitmap for the canvas to draw into.
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*/
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public void setBitmap(Bitmap bitmap) {
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if (!bitmap.isMutable()) {
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throw new IllegalStateException();
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}
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if (mGL != null) {
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throw new RuntimeException("Can't set a bitmap device on a GL canvas");
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}
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throwIfRecycled(bitmap);
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native_setBitmap(mNativeCanvas, bitmap.ni());
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mBitmap = bitmap;
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mDensityScale = bitmap.getDensityScale();
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if (mDensityScale == Bitmap.DENSITY_SCALE_UNKNOWN) mDensityScale = 1.0f;
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}
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/**
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* Set the viewport dimensions if this canvas is GL based. If it is not,
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* this method is ignored and no exception is thrown.
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*
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* @param width The width of the viewport
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* @param height The height of the viewport
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*/
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public void setViewport(int width, int height) {
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if (mGL != null) {
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nativeSetViewport(mNativeCanvas, width, height);
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}
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}
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/**
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* Return true if the device that the current layer draws into is opaque
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* (i.e. does not support per-pixel alpha).
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*
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* @return true if the device that the current layer draws into is opaque
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*/
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public native boolean isOpaque();
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/**
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* Returns the width of the current drawing layer
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*
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* @return the width of the current drawing layer
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*/
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public native int getWidth();
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/**
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* Returns the height of the current drawing layer
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*
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* @return the height of the current drawing layer
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*/
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public native int getHeight();
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/**
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* <p>Returns the density scale for this Canvas' backing bitmap, expressed as a
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* factor of the default density (160dpi.) For instance, a bitmap designed for
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* 240dpi displays will have a density scale of 1.5 whereas a bitmap
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* designed for 160dpi will have a density scale of 1.0.</p>
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*
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* <p>The default density scale is {@link Bitmap#DENSITY_SCALE_UNKNOWN}.</p>
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*
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* @return A scaling factor of the default density (160dpi) or
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* {@link Bitmap#DENSITY_SCALE_UNKNOWN} if the scaling factor is unknown.
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*
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* @see #setDensityScale(float)
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* @see Bitmap#getDensityScale()
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*
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* @hide pending API council approval
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*/
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public float getDensityScale() {
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if (mBitmap != null) {
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return mBitmap.getDensityScale();
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}
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return mDensityScale;
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}
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/**
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* <p>Specifies the density scale for this Canvas' backing bitmap, expressed as a
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* factor of the default density (160dpi.) For instance, a bitmap designed for
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* 240dpi displays will have a density scale of 1.5 whereas a bitmap
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* designed for 160dpi will have a density scale of 1.0.</p>
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*
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* @param densityScale The density scaling factor to use with this bitmap or
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* {@link Bitmap#DENSITY_SCALE_UNKNOWN} if the factor is unknown.
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*
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* @see #getDensityScale()
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* @see Bitmap#setDensityScale(float)
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*
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* @hide pending API council approval
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*/
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public void setDensityScale(float densityScale) {
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if (mBitmap != null) {
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mBitmap.setDensityScale(densityScale);
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}
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mDensityScale = densityScale;
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if (mDensityScale == Bitmap.DENSITY_SCALE_UNKNOWN) mDensityScale = 1.0f;
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}
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// the SAVE_FLAG constants must match their native equivalents
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/** restore the current matrix when restore() is called */
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public static final int MATRIX_SAVE_FLAG = 0x01;
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/** restore the current clip when restore() is called */
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public static final int CLIP_SAVE_FLAG = 0x02;
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/** the layer needs to per-pixel alpha */
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public static final int HAS_ALPHA_LAYER_SAVE_FLAG = 0x04;
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/** the layer needs to 8-bits per color component */
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public static final int FULL_COLOR_LAYER_SAVE_FLAG = 0x08;
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/** clip against the layer's bounds */
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public static final int CLIP_TO_LAYER_SAVE_FLAG = 0x10;
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/** restore everything when restore() is called */
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public static final int ALL_SAVE_FLAG = 0x1F;
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/**
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* Saves the current matrix and clip onto a private stack. Subsequent
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* calls to translate,scale,rotate,skew,concat or clipRect,clipPath
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* will all operate as usual, but when the balancing call to restore()
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* is made, those calls will be forgotten, and the settings that existed
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* before the save() will be reinstated.
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*
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* @return The value to pass to restoreToCount() to balance this save()
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*/
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public native int save();
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/**
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* Based on saveFlags, can save the current matrix and clip onto a private
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* stack. Subsequent calls to translate,scale,rotate,skew,concat or
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* clipRect,clipPath will all operate as usual, but when the balancing
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* call to restore() is made, those calls will be forgotten, and the
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* settings that existed before the save() will be reinstated.
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*
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* @param saveFlags flag bits that specify which parts of the Canvas state
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* to save/restore
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* @return The value to pass to restoreToCount() to balance this save()
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*/
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public native int save(int saveFlags);
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/**
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* This behaves the same as save(), but in addition it allocates an
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* offscreen bitmap. All drawing calls are directed there, and only when
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* the balancing call to restore() is made is that offscreen transfered to
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* the canvas (or the previous layer). Subsequent calls to translate,
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* scale, rotate, skew, concat or clipRect, clipPath all operate on this
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* copy. When the balancing call to restore() is made, this copy is
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* deleted and the previous matrix/clip state is restored.
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*
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* @param bounds May be null. The maximum size the offscreen bitmap
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* needs to be (in local coordinates)
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* @param paint This is copied, and is applied to the offscreen when
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* restore() is called.
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* @param saveFlags see _SAVE_FLAG constants
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* @return value to pass to restoreToCount() to balance this save()
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*/
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public int saveLayer(RectF bounds, Paint paint, int saveFlags) {
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return native_saveLayer(mNativeCanvas, bounds,
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paint != null ? paint.mNativePaint : 0,
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saveFlags);
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}
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/**
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* Helper version of saveLayer() that takes 4 values rather than a RectF.
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*/
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public int saveLayer(float left, float top, float right, float bottom,
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Paint paint, int saveFlags) {
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return native_saveLayer(mNativeCanvas, left, top, right, bottom,
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paint != null ? paint.mNativePaint : 0,
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saveFlags);
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}
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/**
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* This behaves the same as save(), but in addition it allocates an
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* offscreen bitmap. All drawing calls are directed there, and only when
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* the balancing call to restore() is made is that offscreen transfered to
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* the canvas (or the previous layer). Subsequent calls to translate,
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* scale, rotate, skew, concat or clipRect, clipPath all operate on this
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* copy. When the balancing call to restore() is made, this copy is
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* deleted and the previous matrix/clip state is restored.
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*
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* @param bounds The maximum size the offscreen bitmap needs to be
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* (in local coordinates)
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* @param alpha The alpha to apply to the offscreen when when it is
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drawn during restore()
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* @param saveFlags see _SAVE_FLAG constants
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* @return value to pass to restoreToCount() to balance this call
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*/
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public int saveLayerAlpha(RectF bounds, int alpha, int saveFlags) {
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alpha = Math.min(255, Math.max(0, alpha));
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return native_saveLayerAlpha(mNativeCanvas, bounds, alpha, saveFlags);
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}
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/**
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* Helper for saveLayerAlpha() that takes 4 values instead of a RectF.
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*/
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public int saveLayerAlpha(float left, float top, float right, float bottom,
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int alpha, int saveFlags) {
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return native_saveLayerAlpha(mNativeCanvas, left, top, right, bottom,
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alpha, saveFlags);
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}
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/**
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* This call balances a previous call to save(), and is used to remove all
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* modifications to the matrix/clip state since the last save call. It is
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* an error to call restore() more times than save() was called.
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*/
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public native void restore();
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/**
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* Returns the number of matrix/clip states on the Canvas' private stack.
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* This will equal # save() calls - # restore() calls.
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*/
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public native int getSaveCount();
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/**
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* Efficient way to pop any calls to save() that happened after the save
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* count reached saveCount. It is an error for saveCount to be less than 1.
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*
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* Example:
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* int count = canvas.save();
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* ... // more calls potentially to save()
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* canvas.restoreToCount(count);
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* // now the canvas is back in the same state it was before the initial
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* // call to save().
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*
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* @param saveCount The save level to restore to.
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*/
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public native void restoreToCount(int saveCount);
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/**
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* Preconcat the current matrix with the specified translation
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*
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* @param dx The distance to translate in X
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* @param dy The distance to translate in Y
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*/
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public native void translate(float dx, float dy);
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/**
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* Preconcat the current matrix with the specified scale.
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*
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* @param sx The amount to scale in X
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* @param sy The amount to scale in Y
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*/
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public native void scale(float sx, float sy);
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/**
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* Preconcat the current matrix with the specified scale.
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*
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* @param sx The amount to scale in X
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* @param sy The amount to scale in Y
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* @param px The x-coord for the pivot point (unchanged by the rotation)
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* @param py The y-coord for the pivot point (unchanged by the rotation)
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*/
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public final void scale(float sx, float sy, float px, float py) {
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translate(px, py);
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scale(sx, sy);
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translate(-px, -py);
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}
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/**
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* Preconcat the current matrix with the specified rotation.
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*
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* @param degrees The amount to rotate, in degrees
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*/
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public native void rotate(float degrees);
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/**
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* Preconcat the current matrix with the specified rotation.
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*
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* @param degrees The amount to rotate, in degrees
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* @param px The x-coord for the pivot point (unchanged by the rotation)
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* @param py The y-coord for the pivot point (unchanged by the rotation)
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*/
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public final void rotate(float degrees, float px, float py) {
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translate(px, py);
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rotate(degrees);
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translate(-px, -py);
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}
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/**
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* Preconcat the current matrix with the specified skew.
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*
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* @param sx The amount to skew in X
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* @param sy The amount to skew in Y
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*/
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public native void skew(float sx, float sy);
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/**
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* Preconcat the current matrix with the specified matrix.
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*
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* @param matrix The matrix to preconcatenate with the current matrix
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*/
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public void concat(Matrix matrix) {
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native_concat(mNativeCanvas, matrix.native_instance);
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}
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/**
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* Completely replace the current matrix with the specified matrix. If the
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* matrix parameter is null, then the current matrix is reset to identity.
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*
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* @param matrix The matrix to replace the current matrix with. If it is
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* null, set the current matrix to identity.
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*/
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public void setMatrix(Matrix matrix) {
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native_setMatrix(mNativeCanvas,
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matrix == null ? 0 : matrix.native_instance);
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}
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/**
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* Return, in ctm, the current transformation matrix. This does not alter
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* the matrix in the canvas, but just returns a copy of it.
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*/
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public void getMatrix(Matrix ctm) {
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native_getCTM(mNativeCanvas, ctm.native_instance);
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}
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/**
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* Return a new matrix with a copy of the canvas' current transformation
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* matrix.
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*/
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public final Matrix getMatrix() {
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Matrix m = new Matrix();
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getMatrix(m);
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return m;
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}
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/**
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* Modify the current clip with the specified rectangle.
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*
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* @param rect The rect to intersect with the current clip
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* @param op How the clip is modified
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* @return true if the resulting clip is non-empty
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*/
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public boolean clipRect(RectF rect, Region.Op op) {
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return native_clipRect(mNativeCanvas,
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rect.left, rect.top, rect.right, rect.bottom,
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op.nativeInt);
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}
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/**
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* Modify the current clip with the specified rectangle, which is
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* expressed in local coordinates.
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*
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* @param rect The rectangle to intersect with the current clip.
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* @param op How the clip is modified
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* @return true if the resulting clip is non-empty
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*/
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public boolean clipRect(Rect rect, Region.Op op) {
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return native_clipRect(mNativeCanvas,
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rect.left, rect.top, rect.right, rect.bottom,
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op.nativeInt);
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}
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/**
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* Intersect the current clip with the specified rectangle, which is
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* expressed in local coordinates.
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*
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* @param rect The rectangle to intersect with the current clip.
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* @return true if the resulting clip is non-empty
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*/
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public native boolean clipRect(RectF rect);
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/**
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* Intersect the current clip with the specified rectangle, which is
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* expressed in local coordinates.
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*
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* @param rect The rectangle to intersect with the current clip.
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* @return true if the resulting clip is non-empty
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*/
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public native boolean clipRect(Rect rect);
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/**
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* Modify the current clip with the specified rectangle, which is
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* expressed in local coordinates.
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*
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* @param left The left side of the rectangle to intersect with the
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* current clip
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* @param top The top of the rectangle to intersect with the current
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* clip
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* @param right The right side of the rectangle to intersect with the
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* current clip
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* @param bottom The bottom of the rectangle to intersect with the current
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* clip
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* @param op How the clip is modified
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* @return true if the resulting clip is non-empty
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*/
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public boolean clipRect(float left, float top, float right, float bottom,
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Region.Op op) {
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return native_clipRect(mNativeCanvas, left, top, right, bottom,
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op.nativeInt);
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}
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/**
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* Intersect the current clip with the specified rectangle, which is
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* expressed in local coordinates.
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*
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* @param left The left side of the rectangle to intersect with the
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* current clip
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* @param top The top of the rectangle to intersect with the current clip
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* @param right The right side of the rectangle to intersect with the
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* current clip
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* @param bottom The bottom of the rectangle to intersect with the current
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* clip
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* @return true if the resulting clip is non-empty
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*/
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public native boolean clipRect(float left, float top,
|
|
float right, float bottom);
|
|
|
|
/**
|
|
* Intersect the current clip with the specified rectangle, which is
|
|
* expressed in local coordinates.
|
|
*
|
|
* @param left The left side of the rectangle to intersect with the
|
|
* current clip
|
|
* @param top The top of the rectangle to intersect with the current clip
|
|
* @param right The right side of the rectangle to intersect with the
|
|
* current clip
|
|
* @param bottom The bottom of the rectangle to intersect with the current
|
|
* clip
|
|
* @return true if the resulting clip is non-empty
|
|
*/
|
|
public native boolean clipRect(int left, int top,
|
|
int right, int bottom);
|
|
|
|
/**
|
|
* Modify the current clip with the specified path.
|
|
*
|
|
* @param path The path to operate on the current clip
|
|
* @param op How the clip is modified
|
|
* @return true if the resulting is non-empty
|
|
*/
|
|
public boolean clipPath(Path path, Region.Op op) {
|
|
return native_clipPath(mNativeCanvas, path.ni(), op.nativeInt);
|
|
}
|
|
|
|
/**
|
|
* Intersect the current clip with the specified path.
|
|
*
|
|
* @param path The path to intersect with the current clip
|
|
* @return true if the resulting is non-empty
|
|
*/
|
|
public boolean clipPath(Path path) {
|
|
return clipPath(path, Region.Op.INTERSECT);
|
|
}
|
|
|
|
/**
|
|
* Modify the current clip with the specified region. Note that unlike
|
|
* clipRect() and clipPath() which transform their arguments by the
|
|
* current matrix, clipRegion() assumes its argument is already in the
|
|
* coordinate system of the current layer's bitmap, and so not
|
|
* transformation is performed.
|
|
*
|
|
* @param region The region to operate on the current clip, based on op
|
|
* @param op How the clip is modified
|
|
* @return true if the resulting is non-empty
|
|
*/
|
|
public boolean clipRegion(Region region, Region.Op op) {
|
|
return native_clipRegion(mNativeCanvas, region.ni(), op.nativeInt);
|
|
}
|
|
|
|
/**
|
|
* Intersect the current clip with the specified region. Note that unlike
|
|
* clipRect() and clipPath() which transform their arguments by the
|
|
* current matrix, clipRegion() assumes its argument is already in the
|
|
* coordinate system of the current layer's bitmap, and so not
|
|
* transformation is performed.
|
|
*
|
|
* @param region The region to operate on the current clip, based on op
|
|
* @return true if the resulting is non-empty
|
|
*/
|
|
public boolean clipRegion(Region region) {
|
|
return clipRegion(region, Region.Op.INTERSECT);
|
|
}
|
|
|
|
public DrawFilter getDrawFilter() {
|
|
return mDrawFilter;
|
|
}
|
|
|
|
public void setDrawFilter(DrawFilter filter) {
|
|
int nativeFilter = 0;
|
|
if (filter != null) {
|
|
nativeFilter = filter.mNativeInt;
|
|
}
|
|
mDrawFilter = filter;
|
|
nativeSetDrawFilter(mNativeCanvas, nativeFilter);
|
|
}
|
|
|
|
public enum EdgeType {
|
|
BW(0), //!< treat edges by just rounding to nearest pixel boundary
|
|
AA(1); //!< treat edges by rounding-out, since they may be antialiased
|
|
|
|
EdgeType(int nativeInt) {
|
|
this.nativeInt = nativeInt;
|
|
}
|
|
final int nativeInt;
|
|
}
|
|
|
|
/**
|
|
* Return true if the specified rectangle, after being transformed by the
|
|
* current matrix, would lie completely outside of the current clip. Call
|
|
* this to check if an area you intend to draw into is clipped out (and
|
|
* therefore you can skip making the draw calls).
|
|
*
|
|
* @param rect the rect to compare with the current clip
|
|
* @param type specifies how to treat the edges (BW or antialiased)
|
|
* @return true if the rect (transformed by the canvas' matrix)
|
|
* does not intersect with the canvas' clip
|
|
*/
|
|
public boolean quickReject(RectF rect, EdgeType type) {
|
|
return native_quickReject(mNativeCanvas, rect, type.nativeInt);
|
|
}
|
|
|
|
/**
|
|
* Return true if the specified path, after being transformed by the
|
|
* current matrix, would lie completely outside of the current clip. Call
|
|
* this to check if an area you intend to draw into is clipped out (and
|
|
* therefore you can skip making the draw calls). Note: for speed it may
|
|
* return false even if the path itself might not intersect the clip
|
|
* (i.e. the bounds of the path intersects, but the path does not).
|
|
*
|
|
* @param path The path to compare with the current clip
|
|
* @param type true if the path should be considered antialiased,
|
|
* since that means it may
|
|
* affect a larger area (more pixels) than
|
|
* non-antialiased.
|
|
* @return true if the path (transformed by the canvas' matrix)
|
|
* does not intersect with the canvas' clip
|
|
*/
|
|
public boolean quickReject(Path path, EdgeType type) {
|
|
return native_quickReject(mNativeCanvas, path.ni(), type.nativeInt);
|
|
}
|
|
|
|
/**
|
|
* Return true if the specified rectangle, after being transformed by the
|
|
* current matrix, would lie completely outside of the current clip. Call
|
|
* this to check if an area you intend to draw into is clipped out (and
|
|
* therefore you can skip making the draw calls).
|
|
*
|
|
* @param left The left side of the rectangle to compare with the
|
|
* current clip
|
|
* @param top The top of the rectangle to compare with the current
|
|
* clip
|
|
* @param right The right side of the rectangle to compare with the
|
|
* current clip
|
|
* @param bottom The bottom of the rectangle to compare with the
|
|
* current clip
|
|
* @param type true if the rect should be considered antialiased,
|
|
* since that means it may affect a larger area (more
|
|
* pixels) than non-antialiased.
|
|
* @return true if the rect (transformed by the canvas' matrix)
|
|
* does not intersect with the canvas' clip
|
|
*/
|
|
public boolean quickReject(float left, float top, float right, float bottom,
|
|
EdgeType type) {
|
|
return native_quickReject(mNativeCanvas, left, top, right, bottom,
|
|
type.nativeInt);
|
|
}
|
|
|
|
/**
|
|
* Retrieve the clip bounds, returning true if they are non-empty.
|
|
*
|
|
* @param bounds Return the clip bounds here. If it is null, ignore it but
|
|
* still return true if the current clip is non-empty.
|
|
* @return true if the current clip is non-empty.
|
|
*/
|
|
public boolean getClipBounds(Rect bounds) {
|
|
return native_getClipBounds(mNativeCanvas, bounds);
|
|
}
|
|
|
|
/**
|
|
* Retrieve the clip bounds.
|
|
*
|
|
* @return the clip bounds, or [0, 0, 0, 0] if the clip is empty.
|
|
*/
|
|
public final Rect getClipBounds() {
|
|
Rect r = new Rect();
|
|
getClipBounds(r);
|
|
return r;
|
|
}
|
|
|
|
/**
|
|
* Fill the entire canvas' bitmap (restricted to the current clip) with the
|
|
* specified RGB color, using srcover porterduff mode.
|
|
*
|
|
* @param r red component (0..255) of the color to draw onto the canvas
|
|
* @param g green component (0..255) of the color to draw onto the canvas
|
|
* @param b blue component (0..255) of the color to draw onto the canvas
|
|
*/
|
|
public void drawRGB(int r, int g, int b) {
|
|
native_drawRGB(mNativeCanvas, r, g, b);
|
|
}
|
|
|
|
/**
|
|
* Fill the entire canvas' bitmap (restricted to the current clip) with the
|
|
* specified ARGB color, using srcover porterduff mode.
|
|
*
|
|
* @param a alpha component (0..255) of the color to draw onto the canvas
|
|
* @param r red component (0..255) of the color to draw onto the canvas
|
|
* @param g green component (0..255) of the color to draw onto the canvas
|
|
* @param b blue component (0..255) of the color to draw onto the canvas
|
|
*/
|
|
public void drawARGB(int a, int r, int g, int b) {
|
|
native_drawARGB(mNativeCanvas, a, r, g, b);
|
|
}
|
|
|
|
/**
|
|
* Fill the entire canvas' bitmap (restricted to the current clip) with the
|
|
* specified color, using srcover porterduff mode.
|
|
*
|
|
* @param color the color to draw onto the canvas
|
|
*/
|
|
public void drawColor(int color) {
|
|
native_drawColor(mNativeCanvas, color);
|
|
}
|
|
|
|
/**
|
|
* Fill the entire canvas' bitmap (restricted to the current clip) with the
|
|
* specified color and porter-duff xfermode.
|
|
*
|
|
* @param color the color to draw with
|
|
* @param mode the porter-duff mode to apply to the color
|
|
*/
|
|
public void drawColor(int color, PorterDuff.Mode mode) {
|
|
native_drawColor(mNativeCanvas, color, mode.nativeInt);
|
|
}
|
|
|
|
/**
|
|
* Fill the entire canvas' bitmap (restricted to the current clip) with
|
|
* the specified paint. This is equivalent (but faster) to drawing an
|
|
* infinitely large rectangle with the specified paint.
|
|
*
|
|
* @param paint The paint used to draw onto the canvas
|
|
*/
|
|
public void drawPaint(Paint paint) {
|
|
native_drawPaint(mNativeCanvas, paint.mNativePaint);
|
|
}
|
|
|
|
/**
|
|
* Draw a series of points. Each point is centered at the coordinate
|
|
* specified by pts[], and its diameter is specified by the paint's stroke
|
|
* width (as transformed by the canvas' CTM), with special treatment for
|
|
* a stroke width of 0, which always draws exactly 1 pixel (or at most 4
|
|
* if antialiasing is enabled). The shape of the point is controlled by
|
|
* the paint's Cap type. The shape is a square, unless the cap type is
|
|
* Round, in which case the shape is a circle.
|
|
*
|
|
* @param pts Array of points to draw [x0 y0 x1 y1 x2 y2 ...]
|
|
* @param offset Number of values to skip before starting to draw.
|
|
* @param count The number of values to process, after skipping offset
|
|
* of them. Since one point uses two values, the number of
|
|
* "points" that are drawn is really (count >> 1).
|
|
* @param paint The paint used to draw the points
|
|
*/
|
|
public native void drawPoints(float[] pts, int offset, int count,
|
|
Paint paint);
|
|
|
|
/**
|
|
* Helper for drawPoints() that assumes you want to draw the entire array
|
|
*/
|
|
public void drawPoints(float[] pts, Paint paint) {
|
|
drawPoints(pts, 0, pts.length, paint);
|
|
}
|
|
|
|
/**
|
|
* Helper for drawPoints() for drawing a single point.
|
|
*/
|
|
public native void drawPoint(float x, float y, Paint paint);
|
|
|
|
/**
|
|
* Draw a line segment with the specified start and stop x,y coordinates,
|
|
* using the specified paint. NOTE: since a line is always "framed", the
|
|
* Style is ignored in the paint.
|
|
*
|
|
* @param startX The x-coordinate of the start point of the line
|
|
* @param startY The y-coordinate of the start point of the line
|
|
* @param paint The paint used to draw the line
|
|
*/
|
|
public void drawLine(float startX, float startY, float stopX, float stopY,
|
|
Paint paint) {
|
|
native_drawLine(mNativeCanvas, startX, startY, stopX, stopY,
|
|
paint.mNativePaint);
|
|
}
|
|
|
|
/**
|
|
* Draw a series of lines. Each line is taken from 4 consecutive values
|
|
* in the pts array. Thus to draw 1 line, the array must contain at least 4
|
|
* values. This is logically the same as drawing the array as follows:
|
|
* drawLine(pts[0], pts[1], pts[2], pts[3]) followed by
|
|
* drawLine(pts[4], pts[5], pts[6], pts[7]) and so on.
|
|
*
|
|
* @param pts Array of points to draw [x0 y0 x1 y1 x2 y2 ...]
|
|
* @param offset Number of values in the array to skip before drawing.
|
|
* @param count The number of values in the array to process, after
|
|
* skipping "offset" of them. Since each line uses 4 values,
|
|
* the number of "lines" that are drawn is really
|
|
* (count >> 2).
|
|
* @param paint The paint used to draw the points
|
|
*/
|
|
public native void drawLines(float[] pts, int offset, int count,
|
|
Paint paint);
|
|
|
|
public void drawLines(float[] pts, Paint paint) {
|
|
drawLines(pts, 0, pts.length, paint);
|
|
}
|
|
|
|
/**
|
|
* Draw the specified Rect using the specified paint. The rectangle will
|
|
* be filled or framed based on the Style in the paint.
|
|
*
|
|
* @param rect The rect to be drawn
|
|
* @param paint The paint used to draw the rect
|
|
*/
|
|
public void drawRect(RectF rect, Paint paint) {
|
|
native_drawRect(mNativeCanvas, rect, paint.mNativePaint);
|
|
}
|
|
|
|
/**
|
|
* Draw the specified Rect using the specified Paint. The rectangle
|
|
* will be filled or framed based on the Style in the paint.
|
|
*
|
|
* @param r The rectangle to be drawn.
|
|
* @param paint The paint used to draw the rectangle
|
|
*/
|
|
public void drawRect(Rect r, Paint paint) {
|
|
drawRect(r.left, r.top, r.right, r.bottom, paint);
|
|
}
|
|
|
|
|
|
/**
|
|
* Draw the specified Rect using the specified paint. The rectangle will
|
|
* be filled or framed based on the Style in the paint.
|
|
*
|
|
* @param left The left side of the rectangle to be drawn
|
|
* @param top The top side of the rectangle to be drawn
|
|
* @param right The right side of the rectangle to be drawn
|
|
* @param bottom The bottom side of the rectangle to be drawn
|
|
* @param paint The paint used to draw the rect
|
|
*/
|
|
public void drawRect(float left, float top, float right, float bottom,
|
|
Paint paint) {
|
|
native_drawRect(mNativeCanvas, left, top, right, bottom,
|
|
paint.mNativePaint);
|
|
}
|
|
|
|
/**
|
|
* Draw the specified oval using the specified paint. The oval will be
|
|
* filled or framed based on the Style in the paint.
|
|
*
|
|
* @param oval The rectangle bounds of the oval to be drawn
|
|
*/
|
|
public void drawOval(RectF oval, Paint paint) {
|
|
if (oval == null) {
|
|
throw new NullPointerException();
|
|
}
|
|
native_drawOval(mNativeCanvas, oval, paint.mNativePaint);
|
|
}
|
|
|
|
/**
|
|
* Draw the specified circle using the specified paint. If radius is <= 0,
|
|
* then nothing will be drawn. The circle will be filled or framed based
|
|
* on the Style in the paint.
|
|
*
|
|
* @param cx The x-coordinate of the center of the cirle to be drawn
|
|
* @param cy The y-coordinate of the center of the cirle to be drawn
|
|
* @param radius The radius of the cirle to be drawn
|
|
* @param paint The paint used to draw the circle
|
|
*/
|
|
public void drawCircle(float cx, float cy, float radius, Paint paint) {
|
|
native_drawCircle(mNativeCanvas, cx, cy, radius,
|
|
paint.mNativePaint);
|
|
}
|
|
|
|
/**
|
|
* Draw the specified arc, which will be scaled to fit inside the
|
|
* specified oval. If the sweep angle is >= 360, then the oval is drawn
|
|
* completely. Note that this differs slightly from SkPath::arcTo, which
|
|
* treats the sweep angle mod 360.
|
|
*
|
|
* @param oval The bounds of oval used to define the shape and size
|
|
* of the arc
|
|
* @param startAngle Starting angle (in degrees) where the arc begins
|
|
* @param sweepAngle Sweep angle (in degrees) measured clockwise
|
|
* @param useCenter If true, include the center of the oval in the arc, and
|
|
close it if it is being stroked. This will draw a wedge
|
|
* @param paint The paint used to draw the arc
|
|
*/
|
|
public void drawArc(RectF oval, float startAngle, float sweepAngle,
|
|
boolean useCenter, Paint paint) {
|
|
if (oval == null) {
|
|
throw new NullPointerException();
|
|
}
|
|
native_drawArc(mNativeCanvas, oval, startAngle, sweepAngle,
|
|
useCenter, paint.mNativePaint);
|
|
}
|
|
|
|
/**
|
|
* Draw the specified round-rect using the specified paint. The roundrect
|
|
* will be filled or framed based on the Style in the paint.
|
|
*
|
|
* @param rect The rectangular bounds of the roundRect to be drawn
|
|
* @param rx The x-radius of the oval used to round the corners
|
|
* @param ry The y-radius of the oval used to round the corners
|
|
* @param paint The paint used to draw the roundRect
|
|
*/
|
|
public void drawRoundRect(RectF rect, float rx, float ry, Paint paint) {
|
|
if (rect == null) {
|
|
throw new NullPointerException();
|
|
}
|
|
native_drawRoundRect(mNativeCanvas, rect, rx, ry,
|
|
paint.mNativePaint);
|
|
}
|
|
|
|
/**
|
|
* Draw the specified path using the specified paint. The path will be
|
|
* filled or framed based on the Style in the paint.
|
|
*
|
|
* @param path The path to be drawn
|
|
* @param paint The paint used to draw the path
|
|
*/
|
|
public void drawPath(Path path, Paint paint) {
|
|
native_drawPath(mNativeCanvas, path.ni(), paint.mNativePaint);
|
|
}
|
|
|
|
private static void throwIfRecycled(Bitmap bitmap) {
|
|
if (bitmap.isRecycled()) {
|
|
throw new RuntimeException(
|
|
"Canvas: trying to use a recycled bitmap " + bitmap);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Draw the specified bitmap, with its top/left corner at (x,y), using
|
|
* the specified paint, transformed by the current matrix.
|
|
* Note: if the paint contains a maskfilter that generates a mask which
|
|
* extends beyond the bitmap's original width/height (e.g. BlurMaskFilter),
|
|
* then the bitmap will be drawn as if it were in a Shader with CLAMP mode.
|
|
* Thus the color outside of the original width/height will be the edge
|
|
* color replicated.
|
|
*
|
|
* @param bitmap The bitmap to be drawn
|
|
* @param left The position of the left side of the bitmap being drawn
|
|
* @param top The position of the top side of the bitmap being drawn
|
|
* @param paint The paint used to draw the bitmap (may be null)
|
|
*/
|
|
public void drawBitmap(Bitmap bitmap, float left, float top, Paint paint) {
|
|
throwIfRecycled(bitmap);
|
|
native_drawBitmap(mNativeCanvas, bitmap.ni(), left, top,
|
|
paint != null ? paint.mNativePaint : 0, bitmap.isAutoScalingEnabled(),
|
|
bitmap.getDensityScale());
|
|
}
|
|
|
|
/**
|
|
* Draw the specified bitmap, scaling/translating automatically to fill
|
|
* the destination rectangle. If the source rectangle is not null, it
|
|
* specifies the subset of the bitmap to draw.
|
|
* Note: if the paint contains a maskfilter that generates a mask which
|
|
* extends beyond the bitmap's original width/height (e.g. BlurMaskFilter),
|
|
* then the bitmap will be drawn as if it were in a Shader with CLAMP mode.
|
|
* Thus the color outside of the original width/height will be the edge
|
|
* color replicated.
|
|
*
|
|
* @param bitmap The bitmap to be drawn
|
|
* @param src May be null. The subset of the bitmap to be drawn
|
|
* @param dst The rectangle that the bitmap will be scaled/translated
|
|
* to fit into
|
|
* @param paint May be null. The paint used to draw the bitmap
|
|
*/
|
|
public void drawBitmap(Bitmap bitmap, Rect src, RectF dst, Paint paint) {
|
|
if (dst == null) {
|
|
throw new NullPointerException();
|
|
}
|
|
throwIfRecycled(bitmap);
|
|
native_drawBitmap(mNativeCanvas, bitmap.ni(), src, dst,
|
|
paint != null ? paint.mNativePaint : 0);
|
|
}
|
|
|
|
/**
|
|
* Draw the specified bitmap, scaling/translating automatically to fill
|
|
* the destination rectangle. If the source rectangle is not null, it
|
|
* specifies the subset of the bitmap to draw.
|
|
* Note: if the paint contains a maskfilter that generates a mask which
|
|
* extends beyond the bitmap's original width/height (e.g. BlurMaskFilter),
|
|
* then the bitmap will be drawn as if it were in a Shader with CLAMP mode.
|
|
* Thus the color outside of the original width/height will be the edge
|
|
* color replicated.
|
|
*
|
|
* @param bitmap The bitmap to be drawn
|
|
* @param src May be null. The subset of the bitmap to be drawn
|
|
* @param dst The rectangle that the bitmap will be scaled/translated
|
|
* to fit into
|
|
* @param paint May be null. The paint used to draw the bitmap
|
|
*/
|
|
public void drawBitmap(Bitmap bitmap, Rect src, Rect dst, Paint paint) {
|
|
if (dst == null) {
|
|
throw new NullPointerException();
|
|
}
|
|
throwIfRecycled(bitmap);
|
|
native_drawBitmap(mNativeCanvas, bitmap.ni(), src, dst,
|
|
paint != null ? paint.mNativePaint : 0);
|
|
}
|
|
|
|
/**
|
|
* Treat the specified array of colors as a bitmap, and draw it. This gives
|
|
* the same result as first creating a bitmap from the array, and then
|
|
* drawing it, but this method avoids explicitly creating a bitmap object
|
|
* which can be more efficient if the colors are changing often.
|
|
*
|
|
* @param colors Array of colors representing the pixels of the bitmap
|
|
* @param offset Offset into the array of colors for the first pixel
|
|
* @param stride The number of of colors in the array between rows (must be
|
|
* >= width or <= -width).
|
|
* @param x The X coordinate for where to draw the bitmap
|
|
* @param y The Y coordinate for where to draw the bitmap
|
|
* @param width The width of the bitmap
|
|
* @param height The height of the bitmap
|
|
* @param hasAlpha True if the alpha channel of the colors contains valid
|
|
* values. If false, the alpha byte is ignored (assumed to
|
|
* be 0xFF for every pixel).
|
|
* @param paint May be null. The paint used to draw the bitmap
|
|
*/
|
|
public void drawBitmap(int[] colors, int offset, int stride, float x,
|
|
float y, int width, int height, boolean hasAlpha,
|
|
Paint paint) {
|
|
// check for valid input
|
|
if (width < 0) {
|
|
throw new IllegalArgumentException("width must be >= 0");
|
|
}
|
|
if (height < 0) {
|
|
throw new IllegalArgumentException("height must be >= 0");
|
|
}
|
|
if (Math.abs(stride) < width) {
|
|
throw new IllegalArgumentException("abs(stride) must be >= width");
|
|
}
|
|
int lastScanline = offset + (height - 1) * stride;
|
|
int length = colors.length;
|
|
if (offset < 0 || (offset + width > length) || lastScanline < 0
|
|
|| (lastScanline + width > length)) {
|
|
throw new ArrayIndexOutOfBoundsException();
|
|
}
|
|
// quick escape if there's nothing to draw
|
|
if (width == 0 || height == 0) {
|
|
return;
|
|
}
|
|
// punch down to native for the actual draw
|
|
native_drawBitmap(mNativeCanvas, colors, offset, stride, x, y, width, height, hasAlpha,
|
|
paint != null ? paint.mNativePaint : 0);
|
|
}
|
|
|
|
/** Legacy version of drawBitmap(int[] colors, ...) that took ints for x,y
|
|
*/
|
|
public void drawBitmap(int[] colors, int offset, int stride, int x, int y,
|
|
int width, int height, boolean hasAlpha,
|
|
Paint paint) {
|
|
// call through to the common float version
|
|
drawBitmap(colors, offset, stride, (float)x, (float)y, width, height,
|
|
hasAlpha, paint);
|
|
}
|
|
|
|
/**
|
|
* Draw the bitmap using the specified matrix.
|
|
*
|
|
* @param bitmap The bitmap to draw
|
|
* @param matrix The matrix used to transform the bitmap when it is drawn
|
|
* @param paint May be null. The paint used to draw the bitmap
|
|
*/
|
|
public void drawBitmap(Bitmap bitmap, Matrix matrix, Paint paint) {
|
|
nativeDrawBitmapMatrix(mNativeCanvas, bitmap.ni(), matrix.ni(),
|
|
paint != null ? paint.mNativePaint : 0);
|
|
}
|
|
|
|
private static void checkRange(int length, int offset, int count) {
|
|
if ((offset | count) < 0 || offset + count > length) {
|
|
throw new ArrayIndexOutOfBoundsException();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Draw the bitmap through the mesh, where mesh vertices are evenly
|
|
* distributed across the bitmap. There are meshWidth+1 vertices across, and
|
|
* meshHeight+1 vertices down. The verts array is accessed in row-major
|
|
* order, so that the first meshWidth+1 vertices are distributed across the
|
|
* top of the bitmap from left to right. A more general version of this
|
|
* methid is drawVertices().
|
|
*
|
|
* @param bitmap The bitmap to draw using the mesh
|
|
* @param meshWidth The number of columns in the mesh. Nothing is drawn if
|
|
* this is 0
|
|
* @param meshHeight The number of rows in the mesh. Nothing is drawn if
|
|
* this is 0
|
|
* @param verts Array of x,y pairs, specifying where the mesh should be
|
|
* drawn. There must be at least
|
|
* (meshWidth+1) * (meshHeight+1) * 2 + meshOffset values
|
|
* in the array
|
|
* @param vertOffset Number of verts elements to skip before drawing
|
|
* @param colors May be null. Specifies a color at each vertex, which is
|
|
* interpolated across the cell, and whose values are
|
|
* multiplied by the corresponding bitmap colors. If not null,
|
|
* there must be at least (meshWidth+1) * (meshHeight+1) +
|
|
* colorOffset values in the array.
|
|
* @param colorOffset Number of color elements to skip before drawing
|
|
* @param paint May be null. The paint used to draw the bitmap
|
|
*/
|
|
public void drawBitmapMesh(Bitmap bitmap, int meshWidth, int meshHeight,
|
|
float[] verts, int vertOffset,
|
|
int[] colors, int colorOffset, Paint paint) {
|
|
if ((meshWidth | meshHeight | vertOffset | colorOffset) < 0) {
|
|
throw new ArrayIndexOutOfBoundsException();
|
|
}
|
|
if (meshWidth == 0 || meshHeight == 0) {
|
|
return;
|
|
}
|
|
int count = (meshWidth + 1) * (meshHeight + 1);
|
|
// we mul by 2 since we need two floats per vertex
|
|
checkRange(verts.length, vertOffset, count * 2);
|
|
if (colors != null) {
|
|
// no mul by 2, since we need only 1 color per vertex
|
|
checkRange(colors.length, colorOffset, count);
|
|
}
|
|
nativeDrawBitmapMesh(mNativeCanvas, bitmap.ni(), meshWidth, meshHeight,
|
|
verts, vertOffset, colors, colorOffset,
|
|
paint != null ? paint.mNativePaint : 0);
|
|
}
|
|
|
|
public enum VertexMode {
|
|
TRIANGLES(0),
|
|
TRIANGLE_STRIP(1),
|
|
TRIANGLE_FAN(2);
|
|
|
|
VertexMode(int nativeInt) {
|
|
this.nativeInt = nativeInt;
|
|
}
|
|
final int nativeInt;
|
|
}
|
|
|
|
/**
|
|
* Draw the array of vertices, interpreted as triangles (based on mode). The
|
|
* verts array is required, and specifies the x,y pairs for each vertex. If
|
|
* texs is non-null, then it is used to specify the coordinate in shader
|
|
* coordinates to use at each vertex (the paint must have a shader in this
|
|
* case). If there is no texs array, but there is a color array, then each
|
|
* color is interpolated across its corresponding triangle in a gradient. If
|
|
* both texs and colors arrays are present, then they behave as before, but
|
|
* the resulting color at each pixels is the result of multiplying the
|
|
* colors from the shader and the color-gradient together. The indices array
|
|
* is optional, but if it is present, then it is used to specify the index
|
|
* of each triangle, rather than just walking through the arrays in order.
|
|
*
|
|
* @param mode How to interpret the array of vertices
|
|
* @param vertexCount The number of values in the vertices array (and
|
|
* corresponding texs and colors arrays if non-null). Each logical
|
|
* vertex is two values (x, y), vertexCount must be a multiple of 2.
|
|
* @param verts Array of vertices for the mesh
|
|
* @param vertOffset Number of values in the verts to skip before drawing.
|
|
* @param texs May be null. If not null, specifies the coordinates to sample
|
|
* into the current shader (e.g. bitmap tile or gradient)
|
|
* @param texOffset Number of values in texs to skip before drawing.
|
|
* @param colors May be null. If not null, specifies a color for each
|
|
* vertex, to be interpolated across the triangle.
|
|
* @param colorOffset Number of values in colors to skip before drawing.
|
|
* @param indices If not null, array of indices to reference into the
|
|
* vertex (texs, colors) array.
|
|
* @param indexCount number of entries in the indices array (if not null).
|
|
* @param paint Specifies the shader to use if the texs array is non-null.
|
|
*/
|
|
public void drawVertices(VertexMode mode, int vertexCount,
|
|
float[] verts, int vertOffset,
|
|
float[] texs, int texOffset,
|
|
int[] colors, int colorOffset,
|
|
short[] indices, int indexOffset,
|
|
int indexCount, Paint paint) {
|
|
checkRange(verts.length, vertOffset, vertexCount);
|
|
if (texs != null) {
|
|
checkRange(texs.length, texOffset, vertexCount);
|
|
}
|
|
if (colors != null) {
|
|
checkRange(colors.length, colorOffset, vertexCount);
|
|
}
|
|
if (indices != null) {
|
|
checkRange(indices.length, indexOffset, indexCount);
|
|
}
|
|
nativeDrawVertices(mNativeCanvas, mode.nativeInt, vertexCount, verts,
|
|
vertOffset, texs, texOffset, colors, colorOffset,
|
|
indices, indexOffset, indexCount, paint.mNativePaint);
|
|
}
|
|
|
|
/**
|
|
* Draw the text, with origin at (x,y), using the specified paint. The
|
|
* origin is interpreted based on the Align setting in the paint.
|
|
*
|
|
* @param text The text to be drawn
|
|
* @param x The x-coordinate of the origin of the text being drawn
|
|
* @param y The y-coordinate of the origin of the text being drawn
|
|
* @param paint The paint used for the text (e.g. color, size, style)
|
|
*/
|
|
public void drawText(char[] text, int index, int count, float x, float y,
|
|
Paint paint) {
|
|
if ((index | count | (index + count) |
|
|
(text.length - index - count)) < 0) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
native_drawText(mNativeCanvas, text, index, count, x, y,
|
|
paint.mNativePaint);
|
|
}
|
|
|
|
/**
|
|
* Draw the text, with origin at (x,y), using the specified paint. The
|
|
* origin is interpreted based on the Align setting in the paint.
|
|
*
|
|
* @param text The text to be drawn
|
|
* @param x The x-coordinate of the origin of the text being drawn
|
|
* @param y The y-coordinate of the origin of the text being drawn
|
|
* @param paint The paint used for the text (e.g. color, size, style)
|
|
*/
|
|
public native void drawText(String text, float x, float y, Paint paint);
|
|
|
|
/**
|
|
* Draw the text, with origin at (x,y), using the specified paint.
|
|
* The origin is interpreted based on the Align setting in the paint.
|
|
*
|
|
* @param text The text to be drawn
|
|
* @param start The index of the first character in text to draw
|
|
* @param end (end - 1) is the index of the last character in text to draw
|
|
* @param x The x-coordinate of the origin of the text being drawn
|
|
* @param y The y-coordinate of the origin of the text being drawn
|
|
* @param paint The paint used for the text (e.g. color, size, style)
|
|
*/
|
|
public void drawText(String text, int start, int end, float x, float y,
|
|
Paint paint) {
|
|
if ((start | end | (end - start) | (text.length() - end)) < 0) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
native_drawText(mNativeCanvas, text, start, end, x, y,
|
|
paint.mNativePaint);
|
|
}
|
|
|
|
/**
|
|
* Draw the specified range of text, specified by start/end, with its
|
|
* origin at (x,y), in the specified Paint. The origin is interpreted
|
|
* based on the Align setting in the Paint.
|
|
*
|
|
* @param text The text to be drawn
|
|
* @param start The index of the first character in text to draw
|
|
* @param end (end - 1) is the index of the last character in text
|
|
* to draw
|
|
* @param x The x-coordinate of origin for where to draw the text
|
|
* @param y The y-coordinate of origin for where to draw the text
|
|
* @param paint The paint used for the text (e.g. color, size, style)
|
|
*/
|
|
public void drawText(CharSequence text, int start, int end, float x,
|
|
float y, Paint paint) {
|
|
if (text instanceof String || text instanceof SpannedString ||
|
|
text instanceof SpannableString) {
|
|
native_drawText(mNativeCanvas, text.toString(), start, end, x, y,
|
|
paint.mNativePaint);
|
|
}
|
|
else if (text instanceof GraphicsOperations) {
|
|
((GraphicsOperations) text).drawText(this, start, end, x, y,
|
|
paint);
|
|
}
|
|
else {
|
|
char[] buf = TemporaryBuffer.obtain(end - start);
|
|
TextUtils.getChars(text, start, end, buf, 0);
|
|
drawText(buf, 0, end - start, x, y, paint);
|
|
TemporaryBuffer.recycle(buf);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Draw the text in the array, with each character's origin specified by
|
|
* the pos array.
|
|
*
|
|
* @param text The text to be drawn
|
|
* @param index The index of the first character to draw
|
|
* @param count The number of characters to draw, starting from index.
|
|
* @param pos Array of [x,y] positions, used to position each
|
|
* character
|
|
* @param paint The paint used for the text (e.g. color, size, style)
|
|
*/
|
|
public void drawPosText(char[] text, int index, int count, float[] pos,
|
|
Paint paint) {
|
|
if (index < 0 || index + count > text.length || count*2 > pos.length) {
|
|
throw new IndexOutOfBoundsException();
|
|
}
|
|
native_drawPosText(mNativeCanvas, text, index, count, pos,
|
|
paint.mNativePaint);
|
|
}
|
|
|
|
/**
|
|
* Draw the text in the array, with each character's origin specified by
|
|
* the pos array.
|
|
*
|
|
* @param text The text to be drawn
|
|
* @param pos Array of [x,y] positions, used to position each character
|
|
* @param paint The paint used for the text (e.g. color, size, style)
|
|
*/
|
|
public void drawPosText(String text, float[] pos, Paint paint) {
|
|
if (text.length()*2 > pos.length) {
|
|
throw new ArrayIndexOutOfBoundsException();
|
|
}
|
|
native_drawPosText(mNativeCanvas, text, pos, paint.mNativePaint);
|
|
}
|
|
|
|
/**
|
|
* Draw the text, with origin at (x,y), using the specified paint, along
|
|
* the specified path. The paint's Align setting determins where along the
|
|
* path to start the text.
|
|
*
|
|
* @param text The text to be drawn
|
|
* @param path The path the text should follow for its baseline
|
|
* @param hOffset The distance along the path to add to the text's
|
|
* starting position
|
|
* @param vOffset The distance above(-) or below(+) the path to position
|
|
* the text
|
|
* @param paint The paint used for the text (e.g. color, size, style)
|
|
*/
|
|
public void drawTextOnPath(char[] text, int index, int count, Path path,
|
|
float hOffset, float vOffset, Paint paint) {
|
|
if (index < 0 || index + count > text.length) {
|
|
throw new ArrayIndexOutOfBoundsException();
|
|
}
|
|
native_drawTextOnPath(mNativeCanvas, text, index, count,
|
|
path.ni(), hOffset, vOffset,
|
|
paint.mNativePaint);
|
|
}
|
|
|
|
/**
|
|
* Draw the text, with origin at (x,y), using the specified paint, along
|
|
* the specified path. The paint's Align setting determins where along the
|
|
* path to start the text.
|
|
*
|
|
* @param text The text to be drawn
|
|
* @param path The path the text should follow for its baseline
|
|
* @param hOffset The distance along the path to add to the text's
|
|
* starting position
|
|
* @param vOffset The distance above(-) or below(+) the path to position
|
|
* the text
|
|
* @param paint The paint used for the text (e.g. color, size, style)
|
|
*/
|
|
public void drawTextOnPath(String text, Path path, float hOffset,
|
|
float vOffset, Paint paint) {
|
|
if (text.length() > 0) {
|
|
native_drawTextOnPath(mNativeCanvas, text, path.ni(),
|
|
hOffset, vOffset, paint.mNativePaint);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Save the canvas state, draw the picture, and restore the canvas state.
|
|
* This differs from picture.draw(canvas), which does not perform any
|
|
* save/restore.
|
|
*
|
|
* @param picture The picture to be drawn
|
|
*/
|
|
public void drawPicture(Picture picture) {
|
|
picture.endRecording();
|
|
native_drawPicture(mNativeCanvas, picture.ni());
|
|
}
|
|
|
|
/**
|
|
* Draw the picture, stretched to fit into the dst rectangle.
|
|
*/
|
|
public void drawPicture(Picture picture, RectF dst) {
|
|
save();
|
|
translate(dst.left, dst.top);
|
|
if (picture.getWidth() > 0 && picture.getHeight() > 0) {
|
|
scale(dst.width() / picture.getWidth(),
|
|
dst.height() / picture.getHeight());
|
|
}
|
|
drawPicture(picture);
|
|
restore();
|
|
}
|
|
|
|
/**
|
|
* Draw the picture, stretched to fit into the dst rectangle.
|
|
*/
|
|
public void drawPicture(Picture picture, Rect dst) {
|
|
save();
|
|
translate(dst.left, dst.top);
|
|
if (picture.getWidth() > 0 && picture.getHeight() > 0) {
|
|
scale((float)dst.width() / picture.getWidth(),
|
|
(float)dst.height() / picture.getHeight());
|
|
}
|
|
drawPicture(picture);
|
|
restore();
|
|
}
|
|
|
|
protected void finalize() throws Throwable {
|
|
super.finalize();
|
|
finalizer(mNativeCanvas);
|
|
}
|
|
|
|
private static native int initRaster(int nativeBitmapOrZero);
|
|
private static native int initGL();
|
|
private static native void native_setBitmap(int nativeCanvas, int bitmap);
|
|
private static native void nativeSetViewport(int nCanvas, int w, int h);
|
|
private static native int native_saveLayer(int nativeCanvas, RectF bounds,
|
|
int paint, int layerFlags);
|
|
private static native int native_saveLayer(int nativeCanvas, float l,
|
|
float t, float r, float b,
|
|
int paint, int layerFlags);
|
|
private static native int native_saveLayerAlpha(int nativeCanvas,
|
|
RectF bounds, int alpha,
|
|
int layerFlags);
|
|
private static native int native_saveLayerAlpha(int nativeCanvas, float l,
|
|
float t, float r, float b,
|
|
int alpha, int layerFlags);
|
|
|
|
private static native void native_concat(int nCanvas, int nMatrix);
|
|
private static native void native_setMatrix(int nCanvas, int nMatrix);
|
|
private static native boolean native_clipRect(int nCanvas,
|
|
float left, float top,
|
|
float right, float bottom,
|
|
int regionOp);
|
|
private static native boolean native_clipPath(int nativeCanvas,
|
|
int nativePath,
|
|
int regionOp);
|
|
private static native boolean native_clipRegion(int nativeCanvas,
|
|
int nativeRegion,
|
|
int regionOp);
|
|
private static native void nativeSetDrawFilter(int nativeCanvas,
|
|
int nativeFilter);
|
|
private static native boolean native_getClipBounds(int nativeCanvas,
|
|
Rect bounds);
|
|
private static native void native_getCTM(int canvas, int matrix);
|
|
private static native boolean native_quickReject(int nativeCanvas,
|
|
RectF rect,
|
|
int native_edgeType);
|
|
private static native boolean native_quickReject(int nativeCanvas,
|
|
int path,
|
|
int native_edgeType);
|
|
private static native boolean native_quickReject(int nativeCanvas,
|
|
float left, float top,
|
|
float right, float bottom,
|
|
int native_edgeType);
|
|
private static native void native_drawRGB(int nativeCanvas, int r, int g,
|
|
int b);
|
|
private static native void native_drawARGB(int nativeCanvas, int a, int r,
|
|
int g, int b);
|
|
private static native void native_drawColor(int nativeCanvas, int color);
|
|
private static native void native_drawColor(int nativeCanvas, int color,
|
|
int mode);
|
|
private static native void native_drawPaint(int nativeCanvas, int paint);
|
|
private static native void native_drawLine(int nativeCanvas, float startX,
|
|
float startY, float stopX,
|
|
float stopY, int paint);
|
|
private static native void native_drawRect(int nativeCanvas, RectF rect,
|
|
int paint);
|
|
private static native void native_drawRect(int nativeCanvas, float left,
|
|
float top, float right,
|
|
float bottom, int paint);
|
|
private static native void native_drawOval(int nativeCanvas, RectF oval,
|
|
int paint);
|
|
private static native void native_drawCircle(int nativeCanvas, float cx,
|
|
float cy, float radius,
|
|
int paint);
|
|
private static native void native_drawArc(int nativeCanvas, RectF oval,
|
|
float startAngle, float sweep,
|
|
boolean useCenter, int paint);
|
|
private static native void native_drawRoundRect(int nativeCanvas,
|
|
RectF rect, float rx,
|
|
float ry, int paint);
|
|
private static native void native_drawPath(int nativeCanvas, int path,
|
|
int paint);
|
|
private native void native_drawBitmap(int nativeCanvas, int bitmap,
|
|
float left, float top,
|
|
int nativePaintOrZero, boolean autoScale,
|
|
float densityScale);
|
|
private native void native_drawBitmap(int nativeCanvas, int bitmap,
|
|
Rect src, RectF dst,
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int nativePaintOrZero);
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private static native void native_drawBitmap(int nativeCanvas, int bitmap,
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Rect src, Rect dst,
|
|
int nativePaintOrZero);
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|
private static native void native_drawBitmap(int nativeCanvas, int[] colors,
|
|
int offset, int stride, float x,
|
|
float y, int width, int height,
|
|
boolean hasAlpha,
|
|
int nativePaintOrZero);
|
|
private static native void nativeDrawBitmapMatrix(int nCanvas, int nBitmap,
|
|
int nMatrix, int nPaint);
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|
private static native void nativeDrawBitmapMesh(int nCanvas, int nBitmap,
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|
int meshWidth, int meshHeight,
|
|
float[] verts, int vertOffset,
|
|
int[] colors, int colorOffset, int nPaint);
|
|
private static native void nativeDrawVertices(int nCanvas, int mode, int n,
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|
float[] verts, int vertOffset, float[] texs, int texOffset,
|
|
int[] colors, int colorOffset, short[] indices,
|
|
int indexOffset, int indexCount, int nPaint);
|
|
|
|
private static native void native_drawText(int nativeCanvas, char[] text,
|
|
int index, int count, float x,
|
|
float y, int paint);
|
|
private static native void native_drawText(int nativeCanvas, String text,
|
|
int start, int end, float x,
|
|
float y, int paint);
|
|
private static native void native_drawPosText(int nativeCanvas,
|
|
char[] text, int index,
|
|
int count, float[] pos,
|
|
int paint);
|
|
private static native void native_drawPosText(int nativeCanvas,
|
|
String text, float[] pos,
|
|
int paint);
|
|
private static native void native_drawTextOnPath(int nativeCanvas,
|
|
char[] text, int index,
|
|
int count, int path,
|
|
float hOffset,
|
|
float vOffset, int paint);
|
|
private static native void native_drawTextOnPath(int nativeCanvas,
|
|
String text, int path,
|
|
float hOffset,
|
|
float vOffset, int paint);
|
|
private static native void native_drawPicture(int nativeCanvas,
|
|
int nativePicture);
|
|
private static native void finalizer(int nativeCanvas);
|
|
}
|