The Tor Browser: gfx/2d/HelpersCairo.h@97036ab72558 (annotated)

gfx/2d/HelpersCairo.h@97036ab72558 (annotated)

gfx/2d/HelpersCairo.h

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #ifndef MOZILLA_GFX_HELPERSCAIRO_H_
 #define MOZILLA_GFX_HELPERSCAIRO_H_
 #include "2D.h"
 #include "cairo.h"
 #include "Logging.h"
 namespace mozilla {
 namespace gfx {
 static inline cairo_operator_t
 GfxOpToCairoOp(CompositionOp op)
 {
   switch (op)
   {
     case CompositionOp::OP_OVER:
       return CAIRO_OPERATOR_OVER;
     case CompositionOp::OP_ADD:
       return CAIRO_OPERATOR_ADD;
     case CompositionOp::OP_ATOP:
       return CAIRO_OPERATOR_ATOP;
     case CompositionOp::OP_OUT:
       return CAIRO_OPERATOR_OUT;
     case CompositionOp::OP_IN:
       return CAIRO_OPERATOR_IN;
     case CompositionOp::OP_SOURCE:
       return CAIRO_OPERATOR_SOURCE;
     case CompositionOp::OP_DEST_IN:
       return CAIRO_OPERATOR_DEST_IN;
     case CompositionOp::OP_DEST_OUT:
       return CAIRO_OPERATOR_DEST_OUT;
     case CompositionOp::OP_DEST_OVER:
       return CAIRO_OPERATOR_DEST_OVER;
     case CompositionOp::OP_DEST_ATOP:
       return CAIRO_OPERATOR_DEST_ATOP;
     case CompositionOp::OP_XOR:
       return CAIRO_OPERATOR_XOR;
     case CompositionOp::OP_MULTIPLY:
       return CAIRO_OPERATOR_MULTIPLY;
     case CompositionOp::OP_SCREEN:
       return CAIRO_OPERATOR_SCREEN;
     case CompositionOp::OP_OVERLAY:
       return CAIRO_OPERATOR_OVERLAY;
     case CompositionOp::OP_DARKEN:
       return CAIRO_OPERATOR_DARKEN;
     case CompositionOp::OP_LIGHTEN:
       return CAIRO_OPERATOR_LIGHTEN;
     case CompositionOp::OP_COLOR_DODGE:
       return CAIRO_OPERATOR_COLOR_DODGE;
     case CompositionOp::OP_COLOR_BURN:
       return CAIRO_OPERATOR_COLOR_BURN;
     case CompositionOp::OP_HARD_LIGHT:
       return CAIRO_OPERATOR_HARD_LIGHT;
     case CompositionOp::OP_SOFT_LIGHT:
       return CAIRO_OPERATOR_SOFT_LIGHT;
     case CompositionOp::OP_DIFFERENCE:
       return CAIRO_OPERATOR_DIFFERENCE;
     case CompositionOp::OP_EXCLUSION:
       return CAIRO_OPERATOR_EXCLUSION;
     case CompositionOp::OP_HUE:
       return CAIRO_OPERATOR_HSL_HUE;
     case CompositionOp::OP_SATURATION:
       return CAIRO_OPERATOR_HSL_SATURATION;
     case CompositionOp::OP_COLOR:
       return CAIRO_OPERATOR_HSL_COLOR;
     case CompositionOp::OP_LUMINOSITY:
       return CAIRO_OPERATOR_HSL_LUMINOSITY;
     case CompositionOp::OP_COUNT:
       break;
   }
   return CAIRO_OPERATOR_OVER;
 }
 static inline cairo_antialias_t
 GfxAntialiasToCairoAntialias(AntialiasMode antialias)
 {
   switch (antialias)
   {
     case AntialiasMode::NONE:
       return CAIRO_ANTIALIAS_NONE;
     case AntialiasMode::GRAY:
       return CAIRO_ANTIALIAS_GRAY;
     case AntialiasMode::SUBPIXEL:
       return CAIRO_ANTIALIAS_SUBPIXEL;
     case AntialiasMode::DEFAULT:
       return CAIRO_ANTIALIAS_DEFAULT;
   }
   return CAIRO_ANTIALIAS_DEFAULT;
 }
 static inline cairo_filter_t
 GfxFilterToCairoFilter(Filter filter)
 {
   switch (filter)
   {
     case Filter::GOOD:
       return CAIRO_FILTER_GOOD;
     case Filter::LINEAR:
       return CAIRO_FILTER_BILINEAR;
     case Filter::POINT:
       return CAIRO_FILTER_NEAREST;
   }
   return CAIRO_FILTER_BILINEAR;
 }
 static inline cairo_extend_t
 GfxExtendToCairoExtend(ExtendMode extend)
 {
   switch (extend)
   {
     case ExtendMode::CLAMP:
       return CAIRO_EXTEND_PAD;
     case ExtendMode::REPEAT:
       return CAIRO_EXTEND_REPEAT;
     case ExtendMode::REFLECT:
       return CAIRO_EXTEND_REFLECT;
   }
   return CAIRO_EXTEND_PAD;
 }
 static inline cairo_format_t
 GfxFormatToCairoFormat(SurfaceFormat format)
 {
   switch (format)
   {
     case SurfaceFormat::B8G8R8A8:
       return CAIRO_FORMAT_ARGB32;
     case SurfaceFormat::B8G8R8X8:
       return CAIRO_FORMAT_RGB24;
     case SurfaceFormat::A8:
       return CAIRO_FORMAT_A8;
     case SurfaceFormat::R5G6B5:
       return CAIRO_FORMAT_RGB16_565;
     default:
       gfxWarning() << "Unknown image format";
       return CAIRO_FORMAT_ARGB32;
   }
 }
 static inline cairo_content_t
 GfxFormatToCairoContent(SurfaceFormat format)
 {
   switch (format)
   {
     case SurfaceFormat::B8G8R8A8:
       return CAIRO_CONTENT_COLOR_ALPHA;
     case SurfaceFormat::B8G8R8X8:
     case SurfaceFormat::R5G6B5:  //fall through
       return CAIRO_CONTENT_COLOR;
     case SurfaceFormat::A8:
       return CAIRO_CONTENT_ALPHA;
     default:
       gfxWarning() << "Unknown image format";
       return CAIRO_CONTENT_COLOR_ALPHA;
   }
 }
 static inline cairo_line_join_t
 GfxLineJoinToCairoLineJoin(JoinStyle style)
 {
   switch (style)
   {
     case JoinStyle::BEVEL:
       return CAIRO_LINE_JOIN_BEVEL;
     case JoinStyle::ROUND:
       return CAIRO_LINE_JOIN_ROUND;
     case JoinStyle::MITER:
       return CAIRO_LINE_JOIN_MITER;
     case JoinStyle::MITER_OR_BEVEL:
       return CAIRO_LINE_JOIN_MITER;
   }
   return CAIRO_LINE_JOIN_MITER;
 }
 static inline cairo_line_cap_t
 GfxLineCapToCairoLineCap(CapStyle style)
 {
   switch (style)
   {
     case CapStyle::BUTT:
       return CAIRO_LINE_CAP_BUTT;
     case CapStyle::ROUND:
       return CAIRO_LINE_CAP_ROUND;
     case CapStyle::SQUARE:
       return CAIRO_LINE_CAP_SQUARE;
   }
   return CAIRO_LINE_CAP_BUTT;
 }
 static inline SurfaceFormat
 CairoContentToGfxFormat(cairo_content_t content)
 {
   switch (content)
   {
     case CAIRO_CONTENT_COLOR_ALPHA:
       return SurfaceFormat::B8G8R8A8;
     case CAIRO_CONTENT_COLOR:
       // BEWARE! format may be 565
       return SurfaceFormat::B8G8R8X8;
     case CAIRO_CONTENT_ALPHA:
       return SurfaceFormat::A8;
   }
   return SurfaceFormat::B8G8R8A8;
 }
 static inline void
 GfxMatrixToCairoMatrix(const Matrix& mat, cairo_matrix_t& retval)
 {
   cairo_matrix_init(&retval, mat._11, mat._12, mat._21, mat._22, mat._31, mat._32);
 }
 static inline void
 SetCairoStrokeOptions(cairo_t* aCtx, const StrokeOptions& aStrokeOptions)
 {
   cairo_set_line_width(aCtx, aStrokeOptions.mLineWidth);
   cairo_set_miter_limit(aCtx, aStrokeOptions.mMiterLimit);
   if (aStrokeOptions.mDashPattern) {
     // Convert array of floats to array of doubles
     std::vector<double> dashes(aStrokeOptions.mDashLength);
     for (size_t i = 0; i < aStrokeOptions.mDashLength; ++i) {
       dashes[i] = aStrokeOptions.mDashPattern[i];
     }
     cairo_set_dash(aCtx, &dashes[0], aStrokeOptions.mDashLength,
                    aStrokeOptions.mDashOffset);
   }
   cairo_set_line_join(aCtx, GfxLineJoinToCairoLineJoin(aStrokeOptions.mLineJoin));
   cairo_set_line_cap(aCtx, GfxLineCapToCairoLineCap(aStrokeOptions.mLineCap));
 }
 static inline cairo_fill_rule_t
 GfxFillRuleToCairoFillRule(FillRule rule)
 {
   switch (rule)
   {
     case FillRule::FILL_WINDING:
       return CAIRO_FILL_RULE_WINDING;
     case FillRule::FILL_EVEN_ODD:
       return CAIRO_FILL_RULE_EVEN_ODD;
   }
   return CAIRO_FILL_RULE_WINDING;
 }
 // RAII class for temporarily changing the cairo matrix transform. It will use
 // the given matrix transform while it is in scope. When it goes out of scope
 // it will put the cairo context back the way it was.
 class CairoTempMatrix
 {
 public:
   CairoTempMatrix(cairo_t* aCtx, const Matrix& aMatrix)
     : mCtx(aCtx)
   {
     cairo_get_matrix(aCtx, &mSaveMatrix);
     cairo_matrix_t matrix;
     GfxMatrixToCairoMatrix(aMatrix, matrix);
     cairo_set_matrix(aCtx, &matrix);
   }
   ~CairoTempMatrix()
   {
     cairo_set_matrix(mCtx, &mSaveMatrix);
   }
 private:
   cairo_t* mCtx;
   cairo_matrix_t mSaveMatrix;
 };
 }
 }
 #endif /* MOZILLA_GFX_HELPERSCAIRO_H_ */

The Tor Browser / annotate

gfx/2d/HelpersCairo.h@97036ab72558 (annotated)

gfx/2d/HelpersCairo.h