The Tor Browser: gfx/skia/trunk/src/utils/SkCanvasStateUtils.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/utils/SkCanvasStateUtils.cpp@129ffea94266 (annotated)

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

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /*
  * 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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gfx/skia/trunk/src/utils/SkCanvasStateUtils.cpp@129ffea94266 (annotated)

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