The Tor Browser: comparison gfx/skia/trunk/src/utils/SkCanvasStateUtils.cpp

--1:000000000000
+:c30e5aea2a1b
+/*
+* Copyright 2013 Google Inc.
+*
+* Use of this source code is governed by a BSD-style license that can be
+* found in the LICENSE file.
+*/
+#include "SkCanvasStateUtils.h"
+#include "SkBitmapDevice.h"
+#include "SkCanvas.h"
+#include "SkCanvasStack.h"
+#include "SkErrorInternals.h"
+#include "SkWriter32.h"
+#define CANVAS_STATE_VERSION 1
+/*
+* WARNING: The structs below are part of a stable ABI and as such we explicitly
+* use unambigious primitives (e.g. int32_t instead of an enum).
+*
+* ANY CHANGES TO THE STRUCTS BELOW THAT IMPACT THE ABI SHOULD RESULT IN AN
+* UPDATE OF THE CANVAS_STATE_VERSION. SUCH CHANGES SHOULD ONLY BE MADE IF
+* ABSOLUTELY NECESSARY!
+*/
+enum RasterConfigs {
+kUnknown_RasterConfig   = 0,
+kRGB_565_RasterConfig   = 1,
+kARGB_8888_RasterConfig = 2
+};
+typedef int32_t RasterConfig;
+enum CanvasBackends {
+kUnknown_CanvasBackend = 0,
+kRaster_CanvasBackend  = 1,
+kGPU_CanvasBackend     = 2,
+kPDF_CanvasBackend     = 3
+};
+typedef int32_t CanvasBackend;
+struct ClipRect {
+int32_t left, top, right, bottom;
+};
+struct SkMCState {
+float matrix[9];
+// NOTE: this only works for non-antialiased clips
+int32_t clipRectCount;
+ClipRect* clipRects;
+};
+// NOTE: If you add more members, bump CanvasState::version.
+struct SkCanvasLayerState {
+CanvasBackend type;
+int32_t x, y;
+int32_t width;
+int32_t height;
+SkMCState mcState;
+union {
+struct {
+RasterConfig config; // pixel format: a value from RasterConfigs.
+size_t rowBytes;     // Number of bytes from start of one line to next.
+void* pixels;        // The pixels, all (height * rowBytes) of them.
+} raster;
+struct {
+int32_t textureID;
+} gpu;
+};
+};
+class SkCanvasState {
+public:
+SkCanvasState(SkCanvas* canvas) {
+SkASSERT(canvas);
+version = CANVAS_STATE_VERSION;
+width = canvas->getDeviceSize().width();
+height = canvas->getDeviceSize().height();
+layerCount = 0;
+layers = NULL;
+originalCanvas = SkRef(canvas);
+mcState.clipRectCount = 0;
+mcState.clipRects = NULL;
+}
+~SkCanvasState() {
+// loop through the layers and free the data allocated to the clipRects
+for (int i = 0; i < layerCount; ++i) {
+sk_free(layers[i].mcState.clipRects);
+}
+sk_free(mcState.clipRects);
+sk_free(layers);
+// it is now safe to free the canvas since there should be no remaining
+// references to the content that is referenced by this canvas (e.g. pixels)
+originalCanvas->unref();
+}
+/**
+* The version this struct was built with.  This field must always appear
+* first in the struct so that when the versions don't match (and the
+* remaining contents and size are potentially different) we can still
+* compare the version numbers.
+*/
+int32_t version;
+int32_t width;
+int32_t height;
+SkMCState mcState;
+int32_t layerCount;
+SkCanvasLayerState* layers;
+private:
+SkCanvas* originalCanvas;
+};
+////////////////////////////////////////////////////////////////////////////////
+class ClipValidator : public SkCanvas::ClipVisitor {
+public:
+ClipValidator() : fFailed(false) {}
+bool failed() { return fFailed; }
+// ClipVisitor
+virtual void clipRect(const SkRect& rect, SkRegion::Op op, bool antialias) SK_OVERRIDE {
+fFailed |= antialias;
+}
+virtual void clipRRect(const SkRRect& rrect, SkRegion::Op op, bool antialias) SK_OVERRIDE {
+fFailed |= antialias;
+}
+virtual void clipPath(const SkPath&, SkRegion::Op, bool antialias) SK_OVERRIDE {
+fFailed |= antialias;
+}
+private:
+bool fFailed;
+};
+static void setup_MC_state(SkMCState* state, const SkMatrix& matrix, const SkRegion& clip) {
+// initialize the struct
+state->clipRectCount = 0;
+// capture the matrix
+for (int i = 0; i < 9; i++) {
+state->matrix[i] = matrix.get(i);
+}
+/*
+* capture the clip
+*
+* storage is allocated on the stack for the first 4 rects. This value was
+* chosen somewhat arbitrarily, but does allow us to represent simple clips
+* and some more common complex clips (e.g. a clipRect with a sub-rect
+* clipped out of its interior) without needing to malloc any additional memory.
+*/
+SkSWriter32<4*sizeof(ClipRect)> clipWriter;
+if (!clip.isEmpty()) {
+// only returns the b/w clip so aa clips fail
+SkRegion::Iterator clip_iterator(clip);
+for (; !clip_iterator.done(); clip_iterator.next()) {
+// this assumes the SkIRect is stored in l,t,r,b ordering which
+// matches the ordering of our ClipRect struct
+clipWriter.writeIRect(clip_iterator.rect());
+state->clipRectCount++;
+}
+}
+// allocate memory for the clip then and copy them to the struct
+state->clipRects = (ClipRect*) sk_malloc_throw(clipWriter.bytesWritten());
+clipWriter.flatten(state->clipRects);
+}
+SkCanvasState* SkCanvasStateUtils::CaptureCanvasState(SkCanvas* canvas) {
+SkASSERT(canvas);
+// Check the clip can be decomposed into rectangles (i.e. no soft clips).
+ClipValidator validator;
+canvas->replayClips(&validator);
+if (validator.failed()) {
+SkErrorInternals::SetError(kInvalidOperation_SkError,
+"CaptureCanvasState does not support canvases with antialiased clips.\n");
+return NULL;
+}
+SkAutoTDelete<SkCanvasState> canvasState(SkNEW_ARGS(SkCanvasState, (canvas)));
+// decompose the total matrix and clip
+setup_MC_state(&canvasState->mcState, canvas->getTotalMatrix(),
+canvas->internal_private_getTotalClip());
+/*
+* decompose the layers
+*
+* storage is allocated on the stack for the first 3 layers. It is common in
+* some view systems (e.g. Android) that a few non-clipped layers are present
+* and we will not need to malloc any additional memory in those cases.
+*/
+SkSWriter32<3*sizeof(SkCanvasLayerState)> layerWriter;
+int layerCount = 0;
+for (SkCanvas::LayerIter layer(canvas, true/*skipEmptyClips*/); !layer.done(); layer.next()) {
+// we currently only work for bitmap backed devices
+const SkBitmap& bitmap = layer.device()->accessBitmap(true/*changePixels*/);
+if (bitmap.empty() || bitmap.isNull() || !bitmap.lockPixelsAreWritable()) {
+return NULL;
+}
+SkCanvasLayerState* layerState =
+(SkCanvasLayerState*) layerWriter.reserve(sizeof(SkCanvasLayerState));
+layerState->type = kRaster_CanvasBackend;
+layerState->x = layer.x();
+layerState->y = layer.y();
+layerState->width = bitmap.width();
+layerState->height = bitmap.height();
+switch (bitmap.colorType()) {
+case kPMColor_SkColorType:
+layerState->raster.config = kARGB_8888_RasterConfig;
+break;
+case kRGB_565_SkColorType:
+layerState->raster.config = kRGB_565_RasterConfig;
+break;
+default:
+return NULL;
+}
+layerState->raster.rowBytes = bitmap.rowBytes();
+layerState->raster.pixels = bitmap.getPixels();
+setup_MC_state(&layerState->mcState, layer.matrix(), layer.clip());
+layerCount++;
+}
+// allocate memory for the layers and then and copy them to the struct
+SkASSERT(layerWriter.bytesWritten() == layerCount * sizeof(SkCanvasLayerState));
+canvasState->layerCount = layerCount;
+canvasState->layers = (SkCanvasLayerState*) sk_malloc_throw(layerWriter.bytesWritten());
+layerWriter.flatten(canvasState->layers);
+// for now, just ignore any client supplied DrawFilter.
+if (canvas->getDrawFilter()) {
+//        SkDEBUGF(("CaptureCanvasState will ignore the canvases draw filter.\n"));
+}
+return canvasState.detach();
+}
+////////////////////////////////////////////////////////////////////////////////
+static void setup_canvas_from_MC_state(const SkMCState& state, SkCanvas* canvas) {
+// reconstruct the matrix
+SkMatrix matrix;
+for (int i = 0; i < 9; i++) {
+matrix.set(i, state.matrix[i]);
+}
+// reconstruct the clip
+SkRegion clip;
+for (int i = 0; i < state.clipRectCount; ++i) {
+clip.op(SkIRect::MakeLTRB(state.clipRects[i].left,
+state.clipRects[i].top,
+state.clipRects[i].right,
+state.clipRects[i].bottom),
+SkRegion::kUnion_Op);
+}
+canvas->setMatrix(matrix);
+canvas->setClipRegion(clip);
+}
+static SkCanvas* create_canvas_from_canvas_layer(const SkCanvasLayerState& layerState) {
+SkASSERT(kRaster_CanvasBackend == layerState.type);
+SkBitmap bitmap;
+SkColorType colorType =
+layerState.raster.config == kARGB_8888_RasterConfig ? kPMColor_SkColorType :
+layerState.raster.config == kRGB_565_RasterConfig ? kRGB_565_SkColorType :
+kUnknown_SkColorType;
+if (colorType == kUnknown_SkColorType) {
+return NULL;
+}
+bitmap.installPixels(SkImageInfo::Make(layerState.width, layerState.height,
+colorType, kPremul_SkAlphaType),
+layerState.raster.pixels, layerState.raster.rowBytes,
+NULL, NULL);
+SkASSERT(!bitmap.empty());
+SkASSERT(!bitmap.isNull());
+SkAutoTUnref<SkCanvas> canvas(SkNEW_ARGS(SkCanvas, (bitmap)));
+// setup the matrix and clip
+setup_canvas_from_MC_state(layerState.mcState, canvas.get());
+return canvas.detach();
+}
+SkCanvas* SkCanvasStateUtils::CreateFromCanvasState(const SkCanvasState* state) {
+SkASSERT(state);
+// check that the versions match
+if (CANVAS_STATE_VERSION != state->version) {
+SkDebugf("CreateFromCanvasState version does not match the one use to create the input");
+return NULL;
+}
+if (state->layerCount < 1) {
+return NULL;
+}
+SkAutoTUnref<SkCanvasStack> canvas(SkNEW_ARGS(SkCanvasStack, (state->width, state->height)));
+// setup the matrix and clip on the n-way canvas
+setup_canvas_from_MC_state(state->mcState, canvas);
+// Iterate over the layers and add them to the n-way canvas
+for (int i = state->layerCount - 1; i >= 0; --i) {
+SkAutoTUnref<SkCanvas> canvasLayer(create_canvas_from_canvas_layer(state->layers[i]));
+if (!canvasLayer.get()) {
+return NULL;
+}
+canvas->pushCanvas(canvasLayer.get(), SkIPoint::Make(state->layers[i].x,
+state->layers[i].y));
+}
+return canvas.detach();
+}
+////////////////////////////////////////////////////////////////////////////////
+void SkCanvasStateUtils::ReleaseCanvasState(SkCanvasState* state) {
+SkDELETE(state);
+}

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comparison: gfx/skia/trunk/src/utils/SkCanvasStateUtils.cpp

gfx/skia/trunk/src/utils/SkCanvasStateUtils.cpp