| /* |
| * Copyright (C) 2006 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.graphics; |
| |
| import android.text.TextUtils; |
| import android.text.SpannedString; |
| import android.text.SpannableString; |
| import android.text.GraphicsOperations; |
| import android.util.DisplayMetrics; |
| |
| import javax.microedition.khronos.opengles.GL; |
| |
| /** |
| * The Canvas class holds the "draw" calls. To draw something, you need |
| * 4 basic components: A Bitmap to hold the pixels, a Canvas to host |
| * the draw calls (writing into the bitmap), a drawing primitive (e.g. Rect, |
| * Path, text, Bitmap), and a paint (to describe the colors and styles for the |
| * drawing). |
| */ |
| public class Canvas { |
| // assigned in constructors, freed in finalizer |
| final int mNativeCanvas; |
| |
| /* Our native canvas can be either a raster, gl, or picture canvas. |
| If we are raster, then mGL will be null, and mBitmap may or may not be |
| present (our default constructor creates a raster canvas but no |
| java-bitmap is). If we are a gl-based, then mBitmap will be null, and |
| mGL will not be null. Thus both cannot be non-null, but its possible |
| for both to be null. |
| */ |
| private Bitmap mBitmap; // if not null, mGL must be null |
| private GL mGL; // if not null, mBitmap must be null |
| |
| // optional field set by the caller |
| private DrawFilter mDrawFilter; |
| |
| // Package-scoped for quick access. |
| /*package*/ int mDensity = Bitmap.DENSITY_NONE; |
| |
| // Used to determine when compatibility scaling is in effect. |
| private int mScreenDensity = Bitmap.DENSITY_NONE; |
| |
| // Used by native code |
| @SuppressWarnings({"UnusedDeclaration"}) |
| private int mSurfaceFormat; |
| |
| /** |
| * Construct an empty raster canvas. Use setBitmap() to specify a bitmap to |
| * draw into. The initial target density is {@link Bitmap#DENSITY_NONE}; |
| * this will typically be replaced when a target bitmap is set for the |
| * canvas. |
| */ |
| public Canvas() { |
| // 0 means no native bitmap |
| mNativeCanvas = initRaster(0); |
| } |
| |
| /** |
| * Construct a canvas with the specified bitmap to draw into. The bitmap |
| * must be mutable. |
| * |
| * <p>The initial target density of the canvas is the same as the given |
| * bitmap's density. |
| * |
| * @param bitmap Specifies a mutable bitmap for the canvas to draw into. |
| */ |
| public Canvas(Bitmap bitmap) { |
| if (!bitmap.isMutable()) { |
| throw new IllegalStateException( |
| "Immutable bitmap passed to Canvas constructor"); |
| } |
| throwIfRecycled(bitmap); |
| mNativeCanvas = initRaster(bitmap.ni()); |
| mBitmap = bitmap; |
| mDensity = bitmap.mDensity; |
| } |
| |
| /*package*/ Canvas(int nativeCanvas) { |
| if (nativeCanvas == 0) { |
| throw new IllegalStateException(); |
| } |
| mNativeCanvas = nativeCanvas; |
| mDensity = Bitmap.getDefaultDensity(); |
| } |
| |
| /** |
| * Construct a canvas with the specified gl context. All drawing through |
| * this canvas will be redirected to OpenGL. Note: some features may not |
| * be supported in this mode (e.g. some GL implementations may not support |
| * antialiasing or certain effects like ColorMatrix or certain Xfermodes). |
| * However, no exception will be thrown in those cases. |
| * |
| * <p>The initial target density of the canvas is the same as the initial |
| * density of bitmaps as per {@link Bitmap#getDensity() Bitmap.getDensity()}. |
| */ |
| public Canvas(GL gl) { |
| mNativeCanvas = initGL(); |
| mGL = gl; |
| mDensity = Bitmap.getDefaultDensity(); |
| } |
| |
| /** |
| * Return the GL object associated with this canvas, or null if it is not |
| * backed by GL. |
| */ |
| public GL getGL() { |
| return mGL; |
| } |
| |
| /** |
| * Call this to free up OpenGL resources that may be cached or allocated |
| * on behalf of the Canvas. Any subsequent drawing with a GL-backed Canvas |
| * will have to recreate those resources. |
| */ |
| public static void freeGlCaches() { |
| freeCaches(); |
| } |
| |
| /** |
| * Specify a bitmap for the canvas to draw into. As a side-effect, also |
| * updates the canvas's target density to match that of the bitmap. |
| * |
| * @param bitmap Specifies a mutable bitmap for the canvas to draw into. |
| * |
| * @see #setDensity(int) |
| * @see #getDensity() |
| */ |
| public void setBitmap(Bitmap bitmap) { |
| if (!bitmap.isMutable()) { |
| throw new IllegalStateException(); |
| } |
| if (mGL != null) { |
| throw new RuntimeException("Can't set a bitmap device on a GL canvas"); |
| } |
| throwIfRecycled(bitmap); |
| |
| native_setBitmap(mNativeCanvas, bitmap.ni()); |
| mBitmap = bitmap; |
| mDensity = bitmap.mDensity; |
| } |
| |
| /** |
| * Set the viewport dimensions if this canvas is GL based. If it is not, |
| * this method is ignored and no exception is thrown. |
| * |
| * @param width The width of the viewport |
| * @param height The height of the viewport |
| */ |
| public void setViewport(int width, int height) { |
| if (mGL != null) { |
| nativeSetViewport(mNativeCanvas, width, height); |
| } |
| } |
| |
| /** |
| * Return true if the device that the current layer draws into is opaque |
| * (i.e. does not support per-pixel alpha). |
| * |
| * @return true if the device that the current layer draws into is opaque |
| */ |
| public native boolean isOpaque(); |
| |
| /** |
| * Returns the width of the current drawing layer |
| * |
| * @return the width of the current drawing layer |
| */ |
| public native int getWidth(); |
| |
| /** |
| * Returns the height of the current drawing layer |
| * |
| * @return the height of the current drawing layer |
| */ |
| public native int getHeight(); |
| |
| /** |
| * <p>Returns the target density of the canvas. The default density is |
| * derived from the density of its backing bitmap, or |
| * {@link Bitmap#DENSITY_NONE} if there is not one.</p> |
| * |
| * @return Returns the current target density of the canvas, which is used |
| * to determine the scaling factor when drawing a bitmap into it. |
| * |
| * @see #setDensity(int) |
| * @see Bitmap#getDensity() |
| */ |
| public int getDensity() { |
| return mDensity; |
| } |
| |
| /** |
| * <p>Specifies the density for this Canvas' backing bitmap. This modifies |
| * the target density of the canvas itself, as well as the density of its |
| * backing bitmap via {@link Bitmap#setDensity(int) Bitmap.setDensity(int)}. |
| * |
| * @param density The new target density of the canvas, which is used |
| * to determine the scaling factor when drawing a bitmap into it. Use |
| * {@link Bitmap#DENSITY_NONE} to disable bitmap scaling. |
| * |
| * @see #getDensity() |
| * @see Bitmap#setDensity(int) |
| */ |
| public void setDensity(int density) { |
| if (mBitmap != null) { |
| mBitmap.setDensity(density); |
| } |
| mDensity = density; |
| } |
| |
| /** @hide */ |
| public void setScreenDensity(int density) { |
| mScreenDensity = density; |
| } |
| |
| // the SAVE_FLAG constants must match their native equivalents |
| |
| /** restore the current matrix when restore() is called */ |
| public static final int MATRIX_SAVE_FLAG = 0x01; |
| /** restore the current clip when restore() is called */ |
| public static final int CLIP_SAVE_FLAG = 0x02; |
| /** the layer needs to per-pixel alpha */ |
| public static final int HAS_ALPHA_LAYER_SAVE_FLAG = 0x04; |
| /** the layer needs to 8-bits per color component */ |
| public static final int FULL_COLOR_LAYER_SAVE_FLAG = 0x08; |
| /** clip against the layer's bounds */ |
| public static final int CLIP_TO_LAYER_SAVE_FLAG = 0x10; |
| /** restore everything when restore() is called */ |
| public static final int ALL_SAVE_FLAG = 0x1F; |
| |
| /** |
| * Saves the current matrix and clip onto a private stack. Subsequent |
| * calls to translate,scale,rotate,skew,concat or clipRect,clipPath |
| * will all operate as usual, but when the balancing call to restore() |
| * is made, those calls will be forgotten, and the settings that existed |
| * before the save() will be reinstated. |
| * |
| * @return The value to pass to restoreToCount() to balance this save() |
| */ |
| public native int save(); |
| |
| /** |
| * Based on saveFlags, can save the current matrix and clip onto a private |
| * stack. Subsequent calls to translate,scale,rotate,skew,concat or |
| * clipRect,clipPath will all operate as usual, but when the balancing |
| * call to restore() is made, those calls will be forgotten, and the |
| * settings that existed before the save() will be reinstated. |
| * |
| * @param saveFlags flag bits that specify which parts of the Canvas state |
| * to save/restore |
| * @return The value to pass to restoreToCount() to balance this save() |
| */ |
| public native int save(int saveFlags); |
| |
| /** |
| * This behaves the same as save(), but in addition it allocates an |
| * offscreen bitmap. All drawing calls are directed there, and only when |
| * the balancing call to restore() is made is that offscreen transfered to |
| * the canvas (or the previous layer). Subsequent calls to translate, |
| * scale, rotate, skew, concat or clipRect, clipPath all operate on this |
| * copy. When the balancing call to restore() is made, this copy is |
| * deleted and the previous matrix/clip state is restored. |
| * |
| * @param bounds May be null. The maximum size the offscreen bitmap |
| * needs to be (in local coordinates) |
| * @param paint This is copied, and is applied to the offscreen when |
| * restore() is called. |
| * @param saveFlags see _SAVE_FLAG constants |
| * @return value to pass to restoreToCount() to balance this save() |
| */ |
| public int saveLayer(RectF bounds, Paint paint, int saveFlags) { |
| return native_saveLayer(mNativeCanvas, bounds, |
| paint != null ? paint.mNativePaint : 0, |
| saveFlags); |
| } |
| |
| /** |
| * Helper version of saveLayer() that takes 4 values rather than a RectF. |
| */ |
| public int saveLayer(float left, float top, float right, float bottom, |
| Paint paint, int saveFlags) { |
| return native_saveLayer(mNativeCanvas, left, top, right, bottom, |
| paint != null ? paint.mNativePaint : 0, |
| saveFlags); |
| } |
| |
| /** |
| * This behaves the same as save(), but in addition it allocates an |
| * offscreen bitmap. All drawing calls are directed there, and only when |
| * the balancing call to restore() is made is that offscreen transfered to |
| * the canvas (or the previous layer). Subsequent calls to translate, |
| * scale, rotate, skew, concat or clipRect, clipPath all operate on this |
| * copy. When the balancing call to restore() is made, this copy is |
| * deleted and the previous matrix/clip state is restored. |
| * |
| * @param bounds The maximum size the offscreen bitmap needs to be |
| * (in local coordinates) |
| * @param alpha The alpha to apply to the offscreen when when it is |
| drawn during restore() |
| * @param saveFlags see _SAVE_FLAG constants |
| * @return value to pass to restoreToCount() to balance this call |
| */ |
| public int saveLayerAlpha(RectF bounds, int alpha, int saveFlags) { |
| alpha = Math.min(255, Math.max(0, alpha)); |
| return native_saveLayerAlpha(mNativeCanvas, bounds, alpha, saveFlags); |
| } |
| |
| /** |
| * Helper for saveLayerAlpha() that takes 4 values instead of a RectF. |
| */ |
| public int saveLayerAlpha(float left, float top, float right, float bottom, |
| int alpha, int saveFlags) { |
| return native_saveLayerAlpha(mNativeCanvas, left, top, right, bottom, |
| alpha, saveFlags); |
| } |
| |
| /** |
| * This call balances a previous call to save(), and is used to remove all |
| * modifications to the matrix/clip state since the last save call. It is |
| * an error to call restore() more times than save() was called. |
| */ |
| public native void restore(); |
| |
| /** |
| * Returns the number of matrix/clip states on the Canvas' private stack. |
| * This will equal # save() calls - # restore() calls. |
| */ |
| public native int getSaveCount(); |
| |
| /** |
| * Efficient way to pop any calls to save() that happened after the save |
| * count reached saveCount. It is an error for saveCount to be less than 1. |
| * |
| * Example: |
| * int count = canvas.save(); |
| * ... // more calls potentially to save() |
| * canvas.restoreToCount(count); |
| * // now the canvas is back in the same state it was before the initial |
| * // call to save(). |
| * |
| * @param saveCount The save level to restore to. |
| */ |
| public native void restoreToCount(int saveCount); |
| |
| /** |
| * Preconcat the current matrix with the specified translation |
| * |
| * @param dx The distance to translate in X |
| * @param dy The distance to translate in Y |
| */ |
| public native void translate(float dx, float dy); |
| |
| /** |
| * Preconcat the current matrix with the specified scale. |
| * |
| * @param sx The amount to scale in X |
| * @param sy The amount to scale in Y |
| */ |
| public native void scale(float sx, float sy); |
| |
| /** |
| * Preconcat the current matrix with the specified scale. |
| * |
| * @param sx The amount to scale in X |
| * @param sy The amount to scale in Y |
| * @param px The x-coord for the pivot point (unchanged by the rotation) |
| * @param py The y-coord for the pivot point (unchanged by the rotation) |
| */ |
| public final void scale(float sx, float sy, float px, float py) { |
| translate(px, py); |
| scale(sx, sy); |
| translate(-px, -py); |
| } |
| |
| /** |
| * Preconcat the current matrix with the specified rotation. |
| * |
| * @param degrees The amount to rotate, in degrees |
| */ |
| public native void rotate(float degrees); |
| |
| /** |
| * Preconcat the current matrix with the specified rotation. |
| * |
| * @param degrees The amount to rotate, in degrees |
| * @param px The x-coord for the pivot point (unchanged by the rotation) |
| * @param py The y-coord for the pivot point (unchanged by the rotation) |
| */ |
| public final void rotate(float degrees, float px, float py) { |
| translate(px, py); |
| rotate(degrees); |
| translate(-px, -py); |
| } |
| |
| /** |
| * Preconcat the current matrix with the specified skew. |
| * |
| * @param sx The amount to skew in X |
| * @param sy The amount to skew in Y |
| */ |
| public native void skew(float sx, float sy); |
| |
| /** |
| * Preconcat the current matrix with the specified matrix. |
| * |
| * @param matrix The matrix to preconcatenate with the current matrix |
| */ |
| public void concat(Matrix matrix) { |
| native_concat(mNativeCanvas, matrix.native_instance); |
| } |
| |
| /** |
| * Completely replace the current matrix with the specified matrix. If the |
| * matrix parameter is null, then the current matrix is reset to identity. |
| * |
| * @param matrix The matrix to replace the current matrix with. If it is |
| * null, set the current matrix to identity. |
| */ |
| public void setMatrix(Matrix matrix) { |
| native_setMatrix(mNativeCanvas, |
| matrix == null ? 0 : matrix.native_instance); |
| } |
| |
| /** |
| * Return, in ctm, the current transformation matrix. This does not alter |
| * the matrix in the canvas, but just returns a copy of it. |
| */ |
| public void getMatrix(Matrix ctm) { |
| native_getCTM(mNativeCanvas, ctm.native_instance); |
| } |
| |
| /** |
| * Return a new matrix with a copy of the canvas' current transformation |
| * matrix. |
| */ |
| public final Matrix getMatrix() { |
| Matrix m = new Matrix(); |
| getMatrix(m); |
| return m; |
| } |
| |
| /** |
| * Modify the current clip with the specified rectangle. |
| * |
| * @param rect The rect to intersect with the current clip |
| * @param op How the clip is modified |
| * @return true if the resulting clip is non-empty |
| */ |
| public boolean clipRect(RectF rect, Region.Op op) { |
| return native_clipRect(mNativeCanvas, |
| rect.left, rect.top, rect.right, rect.bottom, |
| op.nativeInt); |
| } |
| |
| /** |
| * Modify the current clip with the specified rectangle, which is |
| * expressed in local coordinates. |
| * |
| * @param rect The rectangle to intersect with the current clip. |
| * @param op How the clip is modified |
| * @return true if the resulting clip is non-empty |
| */ |
| public boolean clipRect(Rect rect, Region.Op op) { |
| return native_clipRect(mNativeCanvas, |
| rect.left, rect.top, rect.right, rect.bottom, |
| op.nativeInt); |
| } |
| |
| /** |
| * Intersect the current clip with the specified rectangle, which is |
| * expressed in local coordinates. |
| * |
| * @param rect The rectangle to intersect with the current clip. |
| * @return true if the resulting clip is non-empty |
| */ |
| public native boolean clipRect(RectF rect); |
| |
| /** |
| * Intersect the current clip with the specified rectangle, which is |
| * expressed in local coordinates. |
| * |
| * @param rect The rectangle to intersect with the current clip. |
| * @return true if the resulting clip is non-empty |
| */ |
| public native boolean clipRect(Rect rect); |
| |
| /** |
| * Modify 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 |
| * @param op How the clip is modified |
| * @return true if the resulting clip is non-empty |
| */ |
| public boolean clipRect(float left, float top, float right, float bottom, |
| Region.Op op) { |
| return native_clipRect(mNativeCanvas, left, top, right, bottom, |
| op.nativeInt); |
| } |
| |
| /** |
| * 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(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. |
| * |
| * <p>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. |
| * |
| * <p>If the bitmap and canvas have different densities, this function |
| * will take care of automatically scaling the bitmap to draw at the |
| * same density as the canvas. |
| * |
| * @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, mDensity, mScreenDensity, |
| bitmap.mDensity); |
| } |
| |
| /** |
| * 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. |
| * |
| * <p>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. |
| * |
| * <p>This function <em>ignores the density associated with the bitmap</em>. |
| * This is because the source and destination rectangle coordinate |
| * spaces are in their respective densities, so must already have the |
| * appropriate scaling factor applied. |
| * |
| * @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, |
| mScreenDensity, bitmap.mDensity); |
| } |
| |
| /** |
| * 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. |
| * |
| * <p>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. |
| * |
| * <p>This function <em>ignores the density associated with the bitmap</em>. |
| * This is because the source and destination rectangle coordinate |
| * spaces are in their respective densities, so must already have the |
| * appropriate scaling factor applied. |
| * |
| * @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, |
| mScreenDensity, bitmap.mDensity); |
| } |
| |
| /** |
| * 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(); |
| // If the constructor threw an exception before setting mNativeCanvas, the native finalizer |
| // must not be invoked. |
| if (mNativeCanvas != 0) { |
| finalizer(mNativeCanvas); |
| } |
| } |
| |
| /** |
| * Free up as much memory as possible from private caches (e.g. fonts, |
| * images) |
| * |
| * @hide - for now |
| */ |
| public static native void freeCaches(); |
| |
| 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, |
| int canvasDensity, |
| int screenDensity, |
| int bitmapDensity); |
| private native void native_drawBitmap(int nativeCanvas, int bitmap, |
| Rect src, RectF dst, |
| int nativePaintOrZero, |
| int screenDensity, |
| int bitmapDensity); |
| private static native void native_drawBitmap(int nativeCanvas, int bitmap, |
| Rect src, Rect dst, |
| int nativePaintOrZero, |
| int screenDensity, |
| int bitmapDensity); |
| 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); |
| private static native void nativeDrawBitmapMesh(int nCanvas, int nBitmap, |
| 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, |
| 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); |
| } |
