The Tor Browser: gfx/thebes/gfxPattern.cpp@97036ab72558 (annotated)

gfx/thebes/gfxPattern.cpp@97036ab72558 (annotated)

gfx/thebes/gfxPattern.cpp

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/. */
 #include "gfxTypes.h"
 #include "gfxPattern.h"
 #include "gfxASurface.h"
 #include "gfxPlatform.h"
 #include "gfx2DGlue.h"
 #include "gfxGradientCache.h"
 #include "cairo.h"
 #include <vector>
 using namespace mozilla::gfx;
 gfxPattern::gfxPattern(cairo_pattern_t *aPattern)
   : mGfxPattern(nullptr)
 {
     mPattern = cairo_pattern_reference(aPattern);
 }
 gfxPattern::gfxPattern(const gfxRGBA& aColor)
   : mGfxPattern(nullptr)
 {
     mPattern = cairo_pattern_create_rgba(aColor.r, aColor.g, aColor.b, aColor.a);
 }
 // from another surface
 gfxPattern::gfxPattern(gfxASurface *surface)
   : mGfxPattern(nullptr)
 {
     mPattern = cairo_pattern_create_for_surface(surface->CairoSurface());
 }
 // linear
 gfxPattern::gfxPattern(gfxFloat x0, gfxFloat y0, gfxFloat x1, gfxFloat y1)
   : mGfxPattern(nullptr)
 {
     mPattern = cairo_pattern_create_linear(x0, y0, x1, y1);
 }
 // radial
 gfxPattern::gfxPattern(gfxFloat cx0, gfxFloat cy0, gfxFloat radius0,
                        gfxFloat cx1, gfxFloat cy1, gfxFloat radius1)
   : mGfxPattern(nullptr)
 {
     mPattern = cairo_pattern_create_radial(cx0, cy0, radius0,
                                            cx1, cy1, radius1);
 }
 // Azure
 gfxPattern::gfxPattern(SourceSurface *aSurface, const Matrix &aTransform)
   : mPattern(nullptr)
   , mGfxPattern(nullptr)
   , mSourceSurface(aSurface)
   , mTransform(aTransform)
   , mExtend(EXTEND_NONE)
 {
 }
 gfxPattern::~gfxPattern()
 {
     cairo_pattern_destroy(mPattern);
     if (mGfxPattern) {
       mGfxPattern->~Pattern();
     }
 }
 cairo_pattern_t *
 gfxPattern::CairoPattern()
 {
     return mPattern;
 }
 void
 gfxPattern::AddColorStop(gfxFloat offset, const gfxRGBA& c)
 {
   if (mPattern) {
     mStops = nullptr;
     if (gfxPlatform::GetCMSMode() == eCMSMode_All) {
         gfxRGBA cms;
         qcms_transform *transform = gfxPlatform::GetCMSRGBTransform();
         if (transform)
           gfxPlatform::TransformPixel(c, cms, transform);
         // Use the original alpha to avoid unnecessary float->byte->float
         // conversion errors
         cairo_pattern_add_color_stop_rgba(mPattern, offset,
                                           cms.r, cms.g, cms.b, c.a);
     }
     else
         cairo_pattern_add_color_stop_rgba(mPattern, offset, c.r, c.g, c.b, c.a);
   }
 }
 void
 gfxPattern::SetColorStops(mozilla::RefPtr<mozilla::gfx::GradientStops> aStops)
 {
   mStops = aStops;
 }
 void
 gfxPattern::CacheColorStops(mozilla::gfx::DrawTarget *aDT)
 {
   if (mPattern) {
     mStops = nullptr;
     nsTArray<GradientStop> stops;
     int count = 0;
     cairo_pattern_get_color_stop_count(mPattern, &count);
     stops.SetLength(count);
     for (int n = 0; n < count; ++n) {
       double offset, r, g, b, a;
       cairo_pattern_get_color_stop_rgba(mPattern, n, &offset, &r, &g, &b, &a);
       stops[n].color = mozilla::gfx::Color(r, g, b, a);
       stops[n].offset = offset;
     }
     mStops = gfxGradientCache::GetOrCreateGradientStops(aDT,
                                                         stops,
                                                         (cairo_pattern_get_extend(mPattern) == CAIRO_EXTEND_REPEAT)
                                                         ? mozilla::gfx::ExtendMode::REPEAT
                                                         : mozilla::gfx::ExtendMode::CLAMP);
   }
 }
 void
 gfxPattern::SetMatrix(const gfxMatrix& matrix)
 {
   if (mPattern) {
     cairo_matrix_t mat = *reinterpret_cast<const cairo_matrix_t*>(&matrix);
     cairo_pattern_set_matrix(mPattern, &mat);
   } else {
     mTransform = ToMatrix(matrix);
     // Cairo-pattern matrices specify the conversion from DrawTarget to pattern
     // space. Azure pattern matrices specify the conversion from pattern to
     // DrawTarget space.
     mTransform.Invert();
   }
 }
 gfxMatrix
 gfxPattern::GetMatrix() const
 {
   if (mPattern) {
     cairo_matrix_t mat;
     cairo_pattern_get_matrix(mPattern, &mat);
     return gfxMatrix(*reinterpret_cast<gfxMatrix*>(&mat));
   } else {
     // invert at the higher precision of gfxMatrix
     // cause we need to convert at some point anyways
     gfxMatrix mat = ThebesMatrix(mTransform);
     mat.Invert();
     return mat;
   }
 }
 gfxMatrix
 gfxPattern::GetInverseMatrix() const
 {
   if (mPattern) {
     cairo_matrix_t mat;
     cairo_pattern_get_matrix(mPattern, &mat);
     cairo_matrix_invert(&mat);
     return gfxMatrix(*reinterpret_cast<gfxMatrix*>(&mat));
   } else {
     return ThebesMatrix(mTransform);
   }
 }
 Pattern*
 gfxPattern::GetPattern(DrawTarget *aTarget, Matrix *aPatternTransform)
 {
   if (mGfxPattern) {
     mGfxPattern->~Pattern();
     mGfxPattern = nullptr;
   }
   if (!mPattern) {
     Matrix adjustedMatrix = mTransform;
     if (aPatternTransform)
       AdjustTransformForPattern(adjustedMatrix, aTarget->GetTransform(), aPatternTransform);
     mGfxPattern = new (mSurfacePattern.addr())
       SurfacePattern(mSourceSurface, ToExtendMode(mExtend), adjustedMatrix, mFilter);
     return mGfxPattern;
   }
   GraphicsExtend extend = (GraphicsExtend)cairo_pattern_get_extend(mPattern);
   switch (cairo_pattern_get_type(mPattern)) {
   case CAIRO_PATTERN_TYPE_SOLID:
     {
       double r, g, b, a;
       cairo_pattern_get_rgba(mPattern, &r, &g, &b, &a);
       new (mColorPattern.addr()) ColorPattern(Color(r, g, b, a));
       return mColorPattern.addr();
     }
   case CAIRO_PATTERN_TYPE_SURFACE:
     {
       GraphicsFilter filter = (GraphicsFilter)cairo_pattern_get_filter(mPattern);
       cairo_matrix_t mat;
       cairo_pattern_get_matrix(mPattern, &mat);
       gfxMatrix matrix(*reinterpret_cast<gfxMatrix*>(&mat));
       cairo_surface_t *surf = nullptr;
       cairo_pattern_get_surface(mPattern, &surf);
       if (!mSourceSurface) {
         nsRefPtr<gfxASurface> gfxSurf = gfxASurface::Wrap(surf);
         // The underlying surface here will be kept around by the gfxPattern.
         // This function is intended to be used right away.
         mSourceSurface =
           gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(aTarget, gfxSurf);
       }
       if (mSourceSurface) {
         Matrix newMat = ToMatrix(matrix);
         AdjustTransformForPattern(newMat, aTarget->GetTransform(), aPatternTransform);
         double x, y;
         cairo_surface_get_device_offset(surf, &x, &y);
         newMat.Translate(-x, -y);
         mGfxPattern = new (mSurfacePattern.addr())
           SurfacePattern(mSourceSurface, ToExtendMode(extend), newMat, ToFilter(filter));
         return mGfxPattern;
       }
       break;
     }
   case CAIRO_PATTERN_TYPE_LINEAR:
     {
       double x1, y1, x2, y2;
       cairo_pattern_get_linear_points(mPattern, &x1, &y1, &x2, &y2);
       if (!mStops) {
         int count = 0;
         cairo_pattern_get_color_stop_count(mPattern, &count);
         std::vector<GradientStop> stops;
         for (int i = 0; i < count; i++) {
           GradientStop stop;
           double r, g, b, a, offset;
           cairo_pattern_get_color_stop_rgba(mPattern, i, &offset, &r, &g, &b, &a);
           stop.offset = offset;
           stop.color = Color(Float(r), Float(g), Float(b), Float(a));
           stops.push_back(stop);
         }
         mStops = aTarget->CreateGradientStops(&stops.front(), count, ToExtendMode(extend));
       }
       if (mStops) {
         cairo_matrix_t mat;
         cairo_pattern_get_matrix(mPattern, &mat);
         gfxMatrix matrix(*reinterpret_cast<gfxMatrix*>(&mat));
         Matrix newMat = ToMatrix(matrix);
         AdjustTransformForPattern(newMat, aTarget->GetTransform(), aPatternTransform);
         mGfxPattern = new (mLinearGradientPattern.addr())
           LinearGradientPattern(Point(x1, y1), Point(x2, y2), mStops, newMat);
         return mGfxPattern;
       }
       break;
     }
   case CAIRO_PATTERN_TYPE_RADIAL:
     {
       if (!mStops) {
         int count = 0;
         cairo_pattern_get_color_stop_count(mPattern, &count);
         std::vector<GradientStop> stops;
         for (int i = 0; i < count; i++) {
           GradientStop stop;
           double r, g, b, a, offset;
           cairo_pattern_get_color_stop_rgba(mPattern, i, &offset, &r, &g, &b, &a);
           stop.offset = offset;
           stop.color = Color(Float(r), Float(g), Float(b), Float(a));
           stops.push_back(stop);
         }
         mStops = aTarget->CreateGradientStops(&stops.front(), count, ToExtendMode(extend));
       }
       if (mStops) {
         cairo_matrix_t mat;
         cairo_pattern_get_matrix(mPattern, &mat);
         gfxMatrix matrix(*reinterpret_cast<gfxMatrix*>(&mat));
         Matrix newMat = ToMatrix(matrix);
         AdjustTransformForPattern(newMat, aTarget->GetTransform(), aPatternTransform);
         double x1, y1, x2, y2, r1, r2;
         cairo_pattern_get_radial_circles(mPattern, &x1, &y1, &r1, &x2, &y2, &r2);
         mGfxPattern = new (mRadialGradientPattern.addr())
           RadialGradientPattern(Point(x1, y1), Point(x2, y2), r1, r2, mStops, newMat);
         return mGfxPattern;
       }
       break;
     }
   default:
     /* Reassure the compiler we are handling all the enum values.  */
     break;
   }
   new (mColorPattern.addr()) ColorPattern(Color(0, 0, 0, 0));
   return mColorPattern.addr();
 }
 void
 gfxPattern::SetExtend(GraphicsExtend extend)
 {
   if (mPattern) {
     mStops = nullptr;
     if (extend == EXTEND_PAD_EDGE) {
         if (cairo_pattern_get_type(mPattern) == CAIRO_PATTERN_TYPE_SURFACE) {
             cairo_surface_t *surf = nullptr;
             cairo_pattern_get_surface (mPattern, &surf);
             if (surf) {
                 switch (cairo_surface_get_type(surf)) {
                     case CAIRO_SURFACE_TYPE_WIN32_PRINTING:
                     case CAIRO_SURFACE_TYPE_QUARTZ:
                         extend = EXTEND_NONE;
                         break;
                     case CAIRO_SURFACE_TYPE_WIN32:
                     case CAIRO_SURFACE_TYPE_XLIB:
                     default:
                         extend = EXTEND_PAD;
                         break;
                 }
             }
         }
         // if something went wrong, or not a surface pattern, use PAD
         if (extend == EXTEND_PAD_EDGE)
             extend = EXTEND_PAD;
     }
     cairo_pattern_set_extend(mPattern, (cairo_extend_t)extend);
   } else {
     // This is always a surface pattern and will default to EXTEND_PAD
     // for EXTEND_PAD_EDGE.
     mExtend = extend;
   }
 }
 bool
 gfxPattern::IsOpaque()
 {
   if (mPattern) {
     switch (cairo_pattern_get_type(mPattern)) {
     case CAIRO_PATTERN_TYPE_SURFACE:
       {
         cairo_surface_t *surf = nullptr;
         cairo_pattern_get_surface(mPattern, &surf);
         if (cairo_surface_get_content(surf) == CAIRO_CONTENT_COLOR) {
           return true;
         }
       }
     default:
       return false;
     }
   }
   if (mSourceSurface->GetFormat() == SurfaceFormat::B8G8R8X8) {
     return true;
   }
   return false;
 }
 gfxPattern::GraphicsExtend
 gfxPattern::Extend() const
 {
   if (mPattern) {
     return (GraphicsExtend)cairo_pattern_get_extend(mPattern);
   } else {
     return mExtend;
   }
 }
 void
 gfxPattern::SetFilter(GraphicsFilter filter)
 {
   if (mPattern) {
     cairo_pattern_set_filter(mPattern, (cairo_filter_t)(int)filter);
   } else {
     mFilter = ToFilter(filter);
   }
 }
 GraphicsFilter
 gfxPattern::Filter() const
 {
   if (mPattern) {
     return (GraphicsFilter)cairo_pattern_get_filter(mPattern);
   } else {
     return ThebesFilter(mFilter);
   }
 }
 bool
 gfxPattern::GetSolidColor(gfxRGBA& aColor)
 {
     return cairo_pattern_get_rgba(mPattern,
                                   &aColor.r,
                                   &aColor.g,
                                   &aColor.b,
                                   &aColor.a) == CAIRO_STATUS_SUCCESS;
 }
 already_AddRefed<gfxASurface>
 gfxPattern::GetSurface()
 {
   if (mPattern) {
     cairo_surface_t *surf = nullptr;
     if (cairo_pattern_get_surface (mPattern, &surf) != CAIRO_STATUS_SUCCESS)
         return nullptr;
     return gfxASurface::Wrap(surf);
   } else {
     // We should never be trying to get the surface off an Azure gfx Pattern.
     NS_ERROR("Attempt to get surface off an Azure gfxPattern!");
     return nullptr;
   }
 }
 gfxPattern::GraphicsPatternType
 gfxPattern::GetType() const
 {
   if (mPattern) {
     return (GraphicsPatternType) cairo_pattern_get_type(mPattern);
   } else {
     // We should never be trying to get the type off an Azure gfx Pattern.
     MOZ_ASSERT(0);
     return PATTERN_SURFACE;
   }
 }
 int
 gfxPattern::CairoStatus()
 {
   if (mPattern) {
     return cairo_pattern_status(mPattern);
   } else {
     // An Azure pattern as this point is never in error status.
     return CAIRO_STATUS_SUCCESS;
   }
 }
 void
 gfxPattern::AdjustTransformForPattern(Matrix &aPatternTransform,
                                       const Matrix &aCurrentTransform,
                                       const Matrix *aOriginalTransform)
 {
   aPatternTransform.Invert();
   if (!aOriginalTransform) {
     // User space is unchanged, so to get from pattern space to user space,
     // just invert the cairo matrix.
     aPatternTransform.NudgeToIntegers();
     return;
   }
   // aPatternTransform now maps from pattern space to the user space defined
   // by *aOriginalTransform.
   Matrix mat = aCurrentTransform;
   mat.Invert();
   // mat maps from device space to current user space
   // First, transform from pattern space to original user space. Then transform
   // from original user space to device space. Then transform from
   // device space to current user space.
   aPatternTransform = aPatternTransform * *aOriginalTransform * mat;
   aPatternTransform.NudgeToIntegers();
 }

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gfx/thebes/gfxPattern.cpp@97036ab72558 (annotated)

gfx/thebes/gfxPattern.cpp