BaseCanvas 源码： 这个类是Canvas绘图操作的基类。这里的任何修改都应该伴随着类似于RecordingCanvas的修改。
这个类的目的是在常规JNI和@FastNative JNI之间降低选择的成本，使之仅限于Canvas已经拥有的虚拟调用。

/** @hide */ public abstract class BaseCanvas { /** 只应在构造函数（或如果是软件Canvas.setBitmap）中分配，由NativeAllocation释放。 @hide */ protected long mNativeCanvasWrapper; /** 用于确定兼容性缩放何时生效。 @hide */ protected int mScreenDensity = Bitmap.DENSITY_NONE; /** @hide */ protected int mDensity = Bitmap.DENSITY_NONE; private boolean mAllowHwBitmapsInSwMode = false; protected void throwIfCannotDraw(Bitmap bitmap) { if (bitmap.isRecycled()) { throw new RuntimeException("Canvas: trying to use a recycled bitmap " + bitmap); } if (!bitmap.isPremultiplied() && bitmap.getConfig() == Bitmap.Config.ARGB_8888 && bitmap.hasAlpha()) { throw new RuntimeException("Canvas: trying to use a non-premultiplied bitmap " + bitmap); } throwIfHwBitmapInSwMode(bitmap); }protected final static void checkRange(int length, int offset, int count) { if ((offset | count) < 0 || offset + count > length) { throw new ArrayIndexOutOfBoundsException(); } }public boolean isHardwareAccelerated() { return false; } /** ***************** drawXXX方法见文章下方代码段 ******************************/ /** @hide */ public void setHwBitmapsInSwModeEnabled(boolean enabled) { mAllowHwBitmapsInSwMode = enabled; }/** @hide */ public boolean isHwBitmapsInSwModeEnabled() { return mAllowHwBitmapsInSwMode; }/** @hide */ protected void onHwBitmapInSwMode() { if (!mAllowHwBitmapsInSwMode) { throw new IllegalArgumentException( "Software rendering doesn't support hardware bitmaps"); } }private void throwIfHwBitmapInSwMode(Bitmap bitmap) { if (!isHardwareAccelerated() && bitmap.getConfig() == Bitmap.Config.HARDWARE) { onHwBitmapInSwMode(); } }private void throwIfHasHwBitmapInSwMode(Paint p) { if (isHardwareAccelerated() || p == null) { return; } throwIfHasHwBitmapInSwMode(p.getShader()); }private void throwIfHasHwBitmapInSwMode(Shader shader) { if (shader == null) { return; } if (shader instanceof BitmapShader) { throwIfHwBitmapInSwMode(((BitmapShader) shader).mBitmap); } if (shader instanceof ComposeShader) { throwIfHasHwBitmapInSwMode(((ComposeShader) shader).mShaderA); throwIfHasHwBitmapInSwMode(((ComposeShader) shader).mShaderB); } } /** *****************native drawXXX()方法 见文章下方代码段*************** */ }

drawXXX() 方法，这些方法也在DisplayListCanvas中实现，以便我们可以有选择地应用于它们
draw几何图形

public void drawArc(float left, float top, float right, float bottom, float startAngle, float sweepAngle, boolean useCenter, @NonNull Paint paint) { throwIfHasHwBitmapInSwMode(paint); nDrawArc(mNativeCanvasWrapper, left, top, right, bottom, startAngle, sweepAngle, useCenter, paint.getNativeInstance()); }public void drawArc(@NonNull RectF oval, float startAngle, float sweepAngle, boolean useCenter, @NonNull Paint paint) { throwIfHasHwBitmapInSwMode(paint); drawArc(oval.left, oval.top, oval.right, oval.bottom, startAngle, sweepAngle, useCenter, paint); }public void drawCircle(float cx, float cy, float radius, @NonNull Paint paint) { throwIfHasHwBitmapInSwMode(paint); nDrawCircle(mNativeCanvasWrapper, cx, cy, radius, paint.getNativeInstance()); }public void drawLine(float startX, float startY, float stopX, float stopY, @NonNull Paint paint) { throwIfHasHwBitmapInSwMode(paint); nDrawLine(mNativeCanvasWrapper, startX, startY, stopX, stopY, paint.getNativeInstance()); }public void drawLines(@Size(multiple = 4) @NonNull float[] pts, int offset, int count, @NonNull Paint paint) { throwIfHasHwBitmapInSwMode(paint); nDrawLines(mNativeCanvasWrapper, pts, offset, count, paint.getNativeInstance()); }public void drawLines(@Size(multiple = 4) @NonNull float[] pts, @NonNull Paint paint) { throwIfHasHwBitmapInSwMode(paint); drawLines(pts, 0, pts.length, paint); }public void drawOval(float left, float top, float right, float bottom, @NonNull Paint paint) { throwIfHasHwBitmapInSwMode(paint); nDrawOval(mNativeCanvasWrapper, left, top, right, bottom, paint.getNativeInstance()); }public void drawOval(@NonNull RectF oval, @NonNull Paint paint) { if (oval == null) { throw new NullPointerException(); } throwIfHasHwBitmapInSwMode(paint); drawOval(oval.left, oval.top, oval.right, oval.bottom, paint); }public void drawPoint(float x, float y, @NonNull Paint paint) { throwIfHasHwBitmapInSwMode(paint); nDrawPoint(mNativeCanvasWrapper, x, y, paint.getNativeInstance()); }public void drawPoints(@Size(multiple = 2) float[] pts, int offset, int count, @NonNull Paint paint) { throwIfHasHwBitmapInSwMode(paint); nDrawPoints(mNativeCanvasWrapper, pts, offset, count, paint.getNativeInstance()); }public void drawPoints(@Size(multiple = 2) @NonNull float[] pts, @NonNull Paint paint) { throwIfHasHwBitmapInSwMode(paint); drawPoints(pts, 0, pts.length, paint); }public void drawRect(float left, float top, float right, float bottom, @NonNull Paint paint) { throwIfHasHwBitmapInSwMode(paint); nDrawRect(mNativeCanvasWrapper, left, top, right, bottom, paint.getNativeInstance()); }public void drawRect(@NonNull Rect r, @NonNull Paint paint) { throwIfHasHwBitmapInSwMode(paint); drawRect(r.left, r.top, r.right, r.bottom, paint); }public void drawRect(@NonNull RectF rect, @NonNull Paint paint) { throwIfHasHwBitmapInSwMode(paint); nDrawRect(mNativeCanvasWrapper, rect.left, rect.top, rect.right, rect.bottom, paint.getNativeInstance()); }public void drawRoundRect(float left, float top, float right, float bottom, float rx, float ry, @NonNull Paint paint) { throwIfHasHwBitmapInSwMode(paint); nDrawRoundRect(mNativeCanvasWrapper, left, top, right, bottom, rx, ry, paint.getNativeInstance()); }public void drawRoundRect(@NonNull RectF rect, float rx, float ry, @NonNull Paint paint) { throwIfHasHwBitmapInSwMode(paint); drawRoundRect(rect.left, rect.top, rect.right, rect.bottom, rx, ry, paint); }

drawPath

public void drawPath(@NonNull Path path, @NonNull Paint paint) { throwIfHasHwBitmapInSwMode(paint); if (path.isSimplePath && path.rects != null) { nDrawRegion(mNativeCanvasWrapper, path.rects.mNativeRegion, paint.getNativeInstance()); } else { nDrawPath(mNativeCanvasWrapper, path.readOnlyNI(), paint.getNativeInstance()); } }

drawText

@Deprecated public void drawPosText(@NonNull char[] text, int index, int count, @NonNull @Size(multiple = 2) float[] pos, @NonNull Paint paint) { if (index < 0 || index + count > text.length || count * 2 > pos.length) { throw new IndexOutOfBoundsException(); } throwIfHasHwBitmapInSwMode(paint); for (int i = 0; i < count; i++) { drawText(text, index + i, 1, pos[i * 2], pos[i * 2 + 1], paint); } }@Deprecated public void drawPosText(@NonNull String text, @NonNull @Size(multiple = 2) float[] pos, @NonNull Paint paint) { throwIfHasHwBitmapInSwMode(paint); drawPosText(text.toCharArray(), 0, text.length(), pos, paint); }public void drawText(@NonNull char[] text, int index, int count, float x, float y, @NonNull Paint paint) { if ((index | count | (index + count) | (text.length - index - count)) < 0) { throw new IndexOutOfBoundsException(); } throwIfHasHwBitmapInSwMode(paint); nDrawText(mNativeCanvasWrapper, text, index, count, x, y, paint.mBidiFlags, paint.getNativeInstance()); }public void drawText(@NonNull CharSequence text, int start, int end, float x, float y, @NonNull Paint paint) { if ((start | end | (end - start) | (text.length() - end)) < 0) { throw new IndexOutOfBoundsException(); } throwIfHasHwBitmapInSwMode(paint); if (text instanceof String || text instanceof SpannedString || text instanceof SpannableString) { nDrawText(mNativeCanvasWrapper, text.toString(), start, end, x, y, paint.mBidiFlags, paint.getNativeInstance()); } 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); nDrawText(mNativeCanvasWrapper, buf, 0, end - start, x, y, paint.mBidiFlags, paint.getNativeInstance()); TemporaryBuffer.recycle(buf); } }public void drawText(@NonNull String text, float x, float y, @NonNull Paint paint) { throwIfHasHwBitmapInSwMode(paint); nDrawText(mNativeCanvasWrapper, text, 0, text.length(), x, y, paint.mBidiFlags, paint.getNativeInstance()); }public void drawText(@NonNull String text, int start, int end, float x, float y, @NonNull Paint paint) { if ((start | end | (end - start) | (text.length() - end)) < 0) { throw new IndexOutOfBoundsException(); } throwIfHasHwBitmapInSwMode(paint); nDrawText(mNativeCanvasWrapper, text, start, end, x, y, paint.mBidiFlags, paint.getNativeInstance()); }public void drawTextOnPath(@NonNull char[] text, int index, int count, @NonNull Path path, float hOffset, float vOffset, @NonNull Paint paint) { if (index < 0 || index + count > text.length) { throw new ArrayIndexOutOfBoundsException(); } throwIfHasHwBitmapInSwMode(paint); nDrawTextOnPath(mNativeCanvasWrapper, text, index, count, path.readOnlyNI(), hOffset, vOffset, paint.mBidiFlags, paint.getNativeInstance()); }public void drawTextOnPath(@NonNull String text, @NonNull Path path, float hOffset, float vOffset, @NonNull Paint paint) { if (text.length() > 0) { throwIfHasHwBitmapInSwMode(paint); nDrawTextOnPath(mNativeCanvasWrapper, text, path.readOnlyNI(), hOffset, vOffset, paint.mBidiFlags, paint.getNativeInstance()); } }public void drawTextRun(@NonNull char[] text, int index, int count, int contextIndex, int contextCount, float x, float y, boolean isRtl, @NonNull Paint paint) {if (text == null) { throw new NullPointerException("text is null"); } if (paint == null) { throw new NullPointerException("paint is null"); } if ((index | count | contextIndex | contextCount | index - contextIndex | (contextIndex + contextCount) - (index + count) | text.length - (contextIndex + contextCount)) < 0) { throw new IndexOutOfBoundsException(); }throwIfHasHwBitmapInSwMode(paint); nDrawTextRun(mNativeCanvasWrapper, text, index, count, contextIndex, contextCount, x, y, isRtl, paint.getNativeInstance(), 0 /* measured text */); }public void drawTextRun(@NonNull CharSequence text, int start, int end, int contextStart, int contextEnd, float x, float y, boolean isRtl, @NonNull Paint paint) {if (text == null) { throw new NullPointerException("text is null"); } if (paint == null) { throw new NullPointerException("paint is null"); } if ((start | end | contextStart | contextEnd | start - contextStart | end - start | contextEnd - end | text.length() - contextEnd) < 0) { throw new IndexOutOfBoundsException(); }throwIfHasHwBitmapInSwMode(paint); if (text instanceof String || text instanceof SpannedString || text instanceof SpannableString) { nDrawTextRun(mNativeCanvasWrapper, text.toString(), start, end, contextStart, contextEnd, x, y, isRtl, paint.getNativeInstance()); } else if (text instanceof GraphicsOperations) { ((GraphicsOperations) text).drawTextRun(this, start, end, contextStart, contextEnd, x, y, isRtl, paint); } else { int contextLen = contextEnd - contextStart; int len = end - start; char[] buf = TemporaryBuffer.obtain(contextLen); TextUtils.getChars(text, contextStart, contextEnd, buf, 0); long measuredTextPtr = 0; if (text instanceof PrecomputedText) { PrecomputedText mt = (PrecomputedText) text; int paraIndex = mt.findParaIndex(start); if (end <= mt.getParagraphEnd(paraIndex)) { // 仅支持同一段落中的文本。 measuredTextPtr = mt.getMeasuredParagraph(paraIndex).getNativePtr(); } } nDrawTextRun(mNativeCanvasWrapper, buf, start - contextStart, len, 0, contextLen, x, y, isRtl, paint.getNativeInstance(), measuredTextPtr); TemporaryBuffer.recycle(buf); } }

drawBitmap

public void drawBitmap(@NonNull Bitmap bitmap, float left, float top, @Nullable Paint paint) { throwIfCannotDraw(bitmap); throwIfHasHwBitmapInSwMode(paint); nDrawBitmap(mNativeCanvasWrapper, bitmap, left, top, paint != null ? paint.getNativeInstance() : 0, mDensity, mScreenDensity, bitmap.mDensity); }public void drawBitmap(@NonNull Bitmap bitmap, @NonNull Matrix matrix, @Nullable Paint paint) { throwIfHasHwBitmapInSwMode(paint); nDrawBitmapMatrix(mNativeCanvasWrapper, bitmap, matrix.ni(), paint != null ? paint.getNativeInstance() : 0); }public void drawBitmap(@NonNull Bitmap bitmap, @Nullable Rect src, @NonNull Rect dst, @Nullable Paint paint) { if (dst == null) { throw new NullPointerException(); } throwIfCannotDraw(bitmap); throwIfHasHwBitmapInSwMode(paint); final long nativePaint = paint == null ? 0 : paint.getNativeInstance(); int left, top, right, bottom; if (src =https://www.it610.com/article/= null) { left = top = 0; right = bitmap.getWidth(); bottom = bitmap.getHeight(); } else { left = src.left; right = src.right; top = src.top; bottom = src.bottom; }nDrawBitmap(mNativeCanvasWrapper, bitmap, left, top, right, bottom, dst.left, dst.top, dst.right, dst.bottom, nativePaint, mScreenDensity, bitmap.mDensity); }public void drawBitmap(@NonNull Bitmap bitmap, @Nullable Rect src, @NonNull RectF dst, @Nullable Paint paint) { if (dst == null) { throw new NullPointerException(); } throwIfCannotDraw(bitmap); throwIfHasHwBitmapInSwMode(paint); final long nativePaint = paint == null ? 0 : paint.getNativeInstance(); float left, top, right, bottom; if (src == null) { left = top = 0; right = bitmap.getWidth(); bottom = bitmap.getHeight(); } else { left = src.left; right = src.right; top = src.top; bottom = src.bottom; }nDrawBitmap(mNativeCanvasWrapper, bitmap, left, top, right, bottom, dst.left, dst.top, dst.right, dst.bottom, nativePaint, mScreenDensity, bitmap.mDensity); }@Deprecated public void drawBitmap(@NonNull int[] colors, int offset, int stride, float x, float y, int width, int height, boolean hasAlpha, @Nullable 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(); } throwIfHasHwBitmapInSwMode(paint); // 如果没什么可画的，就赶快避开 if (width == 0 || height == 0) { return; } // 打卡到本地进行实际绘图 nDrawBitmap(mNativeCanvasWrapper, colors, offset, stride, x, y, width, height, hasAlpha, paint != null ? paint.getNativeInstance() : 0); }@Deprecated public void drawBitmap(@NonNull int[] colors, int offset, int stride, int x, int y, int width, int height, boolean hasAlpha, @Nullable Paint paint) { // 调用通用float版本 drawBitmap(colors, offset, stride, (float) x, (float) y, width, height, hasAlpha, paint); }public void drawBitmapMesh(@NonNull Bitmap bitmap, int meshWidth, int meshHeight, @NonNull float[] verts, int vertOffset, @Nullable int[] colors, int colorOffset, @Nullable Paint paint) { if ((meshWidth | meshHeight | vertOffset | colorOffset) < 0) { throw new ArrayIndexOutOfBoundsException(); } throwIfHasHwBitmapInSwMode(paint); if (meshWidth == 0 || meshHeight == 0) { return; } int count = (meshWidth + 1) * (meshHeight + 1); // 因为每个顶点需要两个浮点数，所以要乘以2 checkRange(verts.length, vertOffset, count * 2); if (colors != null) { // 因为每个顶点只需要一种颜色，没有乘以2 checkRange(colors.length, colorOffset, count); } nDrawBitmapMesh(mNativeCanvasWrapper, bitmap, meshWidth, meshHeight, verts, vertOffset, colors, colorOffset, paint != null ? paint.getNativeInstance() : 0); }

draw颜色

public void drawARGB(int a, int r, int g, int b) { drawColor(Color.argb(a, r, g, b)); }public void drawRGB(int r, int g, int b) { drawColor(Color.rgb(r, g, b)); }public void drawColor(@ColorInt int color) { nDrawColor(mNativeCanvasWrapper, color, PorterDuff.Mode.SRC_OVER.nativeInt); }public void drawColor(@ColorInt int color, @NonNull PorterDuff.Mode mode) { nDrawColor(mNativeCanvasWrapper, color, mode.nativeInt); }public void drawPaint(@NonNull Paint paint) { nDrawPaint(mNativeCanvasWrapper, paint.getNativeInstance()); }public void drawPatch(@NonNull NinePatch patch, @NonNull Rect dst, @Nullable Paint paint) { Bitmap bitmap = patch.getBitmap(); throwIfCannotDraw(bitmap); throwIfHasHwBitmapInSwMode(paint); final long nativePaint = paint == null ? 0 : paint.getNativeInstance(); nDrawNinePatch(mNativeCanvasWrapper, bitmap.getNativeInstance(), patch.mNativeChunk, dst.left, dst.top, dst.right, dst.bottom, nativePaint, mDensity, patch.getDensity()); }public void drawPatch(@NonNull NinePatch patch, @NonNull RectF dst, @Nullable Paint paint) { Bitmap bitmap = patch.getBitmap(); throwIfCannotDraw(bitmap); throwIfHasHwBitmapInSwMode(paint); final long nativePaint = paint == null ? 0 : paint.getNativeInstance(); nDrawNinePatch(mNativeCanvasWrapper, bitmap.getNativeInstance(), patch.mNativeChunk, dst.left, dst.top, dst.right, dst.bottom, nativePaint, mDensity, patch.getDensity()); }public void drawVertices(@NonNull VertexMode mode, int vertexCount, @NonNull float[] verts, int vertOffset, @Nullable float[] texs, int texOffset, @Nullable int[] colors, int colorOffset, @Nullable short[] indices, int indexOffset, int indexCount, @NonNull Paint paint) { checkRange(verts.length, vertOffset, vertexCount); if (isHardwareAccelerated()) { return; } if (texs != null) { checkRange(texs.length, texOffset, vertexCount); } if (colors != null) { checkRange(colors.length, colorOffset, vertexCount / 2); } if (indices != null) { checkRange(indices.length, indexOffset, indexCount); } throwIfHasHwBitmapInSwMode(paint); nDrawVertices(mNativeCanvasWrapper, mode.nativeInt, vertexCount, verts, vertOffset, texs, texOffset, colors, colorOffset, indices, indexOffset, indexCount, paint.getNativeInstance()); }

native drawXXX()
【Android|BaseCanvas】JNI注册由android_view_Canvas.cpp处理

private static native void nDrawBitmap(long nativeCanvas, Bitmap bitmap, float left, float top, long nativePaintOrZero, int canvasDensity, int screenDensity, int bitmapDensity); private static native void nDrawBitmap(long nativeCanvas, Bitmap bitmap, float srcLeft, float srcTop, float srcRight, float srcBottom, float dstLeft, float dstTop, float dstRight, float dstBottom, long nativePaintOrZero, int screenDensity, int bitmapDensity); private static native void nDrawBitmap(long nativeCanvas, int[] colors, int offset, int stride, float x, float y, int width, int height, boolean hasAlpha, long nativePaintOrZero); private static native void nDrawColor(long nativeCanvas, int color, int mode); private static native void nDrawPaint(long nativeCanvas, long nativePaint); private static native void nDrawPoint(long canvasHandle, float x, float y, long paintHandle); private static native void nDrawPoints(long canvasHandle, float[] pts, int offset, int count, long paintHandle); private static native void nDrawLine(long nativeCanvas, float startX, float startY, float stopX, float stopY, long nativePaint); private static native void nDrawLines(long canvasHandle, float[] pts, int offset, int count, long paintHandle); private static native void nDrawRect(long nativeCanvas, float left, float top, float right, float bottom, long nativePaint); private static native void nDrawOval(long nativeCanvas, float left, float top, float right, float bottom, long nativePaint); private static native void nDrawCircle(long nativeCanvas, float cx, float cy, float radius, long nativePaint); private static native void nDrawArc(long nativeCanvas, float left, float top, float right, float bottom, float startAngle, float sweep, boolean useCenter, long nativePaint); private static native void nDrawRoundRect(long nativeCanvas, float left, float top, float right, float bottom, float rx, float ry, long nativePaint); private static native void nDrawPath(long nativeCanvas, long nativePath, long nativePaint); private static native void nDrawRegion(long nativeCanvas, long nativeRegion, long nativePaint); private static native void nDrawNinePatch(long nativeCanvas, long nativeBitmap, long ninePatch, float dstLeft, float dstTop, float dstRight, float dstBottom, long nativePaintOrZero, int screenDensity, int bitmapDensity); private static native void nDrawBitmapMatrix(long nativeCanvas, Bitmap bitmap, long nativeMatrix, long nativePaint); private static native void nDrawBitmapMesh(long nativeCanvas, Bitmap bitmap, int meshWidth, int meshHeight, float[] verts, int vertOffset, int[] colors, int colorOffset, long nativePaint); private static native void nDrawVertices(long nativeCanvas, int mode, int n, float[] verts, int vertOffset, float[] texs, int texOffset, int[] colors, int colorOffset, short[] indices, int indexOffset, int indexCount, long nativePaint); private static native void nDrawText(long nativeCanvas, char[] text, int index, int count, float x, float y, int flags, long nativePaint); private static native void nDrawText(long nativeCanvas, String text, int start, int end, float x, float y, int flags, long nativePaint); private static native void nDrawTextRun(long nativeCanvas, String text, int start, int end, int contextStart, int contextEnd, float x, float y, boolean isRtl, long nativePaint); private static native void nDrawTextRun(long nativeCanvas, char[] text, int start, int count, int contextStart, int contextCount, float x, float y, boolean isRtl, long nativePaint, long nativePrecomputedText); private static native void nDrawTextOnPath(long nativeCanvas, char[] text, int index, int count, long nativePath, float hOffset, float vOffset, int bidiFlags, long nativePaint); private static native void nDrawTextOnPath(long nativeCanvas, String text, long nativePath, float hOffset, float vOffset, int flags, long nativePaint);

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