gfx/2d/DrawTargetOffset.cpp
author Matt Woodrow <mwoodrow@mozilla.com>
Tue, 06 Nov 2018 00:39:59 +0000
changeset 444510 4261b7dc70f79703570b1e38fcea17669299f476
parent 430443 89a67ef04c61a3f01146f082676259e2ac585fbf
child 444519 1a5817b175deca1b4e2500eb74f3e3d602c8def7
permissions -rw-r--r--
Bug 1456555 - Fix bugs in DrawTargetOffset. r=mstange MozReview-Commit-ID: I4XFoTp1szZ Depends on D10033 Differential Revision: https://phabricator.services.mozilla.com/D10036

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "DrawTargetOffset.h"
#include "Logging.h"
#include "PathHelpers.h"

using namespace std;

namespace mozilla {
namespace gfx {

DrawTargetOffset::DrawTargetOffset()
{
}

bool
DrawTargetOffset::Init(DrawTarget *aDrawTarget, IntPoint aOrigin)
{
  mDrawTarget = aDrawTarget;
  mOrigin = aOrigin;
  mDrawTarget->SetTransform(Matrix::Translation(-mOrigin.x,
                                                -mOrigin.y));
  mFormat = mDrawTarget->GetFormat();
  SetPermitSubpixelAA(IsOpaque(mFormat));
  return true;
}

already_AddRefed<SourceSurface>
DrawTargetOffset::Snapshot()
{
  return mDrawTarget->Snapshot();
}

void
DrawTargetOffset::DetachAllSnapshots()
{}

// Skip the mClippedOut check since this is only used for Flush() which
// should happen even if we're clipped.
#define OFFSET_COMMAND(command) \
  void \
  DrawTargetOffset::command() \
  { \
    mDrawTarget->command(); \
  }
#define OFFSET_COMMAND1(command, type1) \
  void \
  DrawTargetOffset::command(type1 arg1) \
  { \
    mDrawTarget->command(arg1); \
  }
#define OFFSET_COMMAND3(command, type1, type2, type3) \
  void \
  DrawTargetOffset::command(type1 arg1, type2 arg2, type3 arg3) \
  { \
    mDrawTarget->command(arg1, arg2, arg3); \
  }
#define OFFSET_COMMAND4(command, type1, type2, type3, type4) \
  void \
  DrawTargetOffset::command(type1 arg1, type2 arg2, type3 arg3, type4 arg4) \
  { \
    mDrawTarget->command(arg1, arg2, arg3, arg4); \
  }
#define OFFSET_COMMAND5(command, type1, type2, type3, type4, type5) \
  void \
  DrawTargetOffset::command(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5) \
  { \
    mDrawTarget->command(arg1, arg2, arg3, arg4, arg5); \
  }

OFFSET_COMMAND(Flush)
OFFSET_COMMAND1(ClearRect, const Rect&)
OFFSET_COMMAND4(MaskSurface, const Pattern&, SourceSurface*, Point, const DrawOptions&)
OFFSET_COMMAND4(FillGlyphs, ScaledFont*, const GlyphBuffer&, const Pattern&, const DrawOptions&)
OFFSET_COMMAND3(Mask, const Pattern&, const Pattern&, const DrawOptions&)

void
DrawTargetOffset::DrawFilter(FilterNode* aNode, const Rect& aSourceRect, const Point& aDestPoint, const DrawOptions& aOptions)
{
  auto clone = mTransform;
  bool invertible = clone.Invert();
  // aSourceRect is in filter space. The filter outputs from aSourceRect need
  // to be drawn at aDestPoint in user space.
  Rect userSpaceSource = Rect(aDestPoint, aSourceRect.Size());
  if (invertible) {
    // Try to reduce the source rect so that it's not much bigger
    // than the draw target. The result is not minimal. Examples
    // are left as an exercise for the reader.
    auto destRect = Rect(mOrigin.x,
                         mOrigin.y,
                         mDrawTarget->GetSize().width,
                         mDrawTarget->GetSize().height);
    Rect userSpaceBounds = clone.TransformBounds(destRect);
    userSpaceSource = userSpaceSource.Intersect(userSpaceBounds);
  }

  // Compute how much we moved the top-left of the source rect by, and use that
  // to compute the new dest point, and move our intersected source rect back
  // into the (new) filter space.
  Point shift = userSpaceSource.TopLeft() - aDestPoint;
  Rect filterSpaceSource = Rect(aSourceRect.TopLeft() + shift, userSpaceSource.Size());
  mDrawTarget->DrawFilter(aNode, filterSpaceSource, aDestPoint + shift, aOptions);
}

void
DrawTargetOffset::PushClip(const Path* aPath)
{
  mDrawTarget->PushClip(aPath);
}

void
DrawTargetOffset::PushClipRect(const Rect& aRect)
{
  mDrawTarget->PushClipRect(aRect);
}

void
DrawTargetOffset::PopClip()
{
  mDrawTarget->PopClip();
}

void
DrawTargetOffset::CopySurface(SourceSurface *aSurface,
                             const IntRect &aSourceRect,
                             const IntPoint &aDestination)
{
  IntPoint tileOrigin = mOrigin;
  // CopySurface ignores the transform, account for that here.
  mDrawTarget->CopySurface(aSurface, aSourceRect, aDestination - tileOrigin);
}

void
DrawTargetOffset::SetTransform(const Matrix& aTransform)
{
  Matrix mat = aTransform;
  mat.PostTranslate(Float(-mOrigin.x), Float(-mOrigin.y));
  mDrawTarget->SetTransform(mat);

  DrawTarget::SetTransform(aTransform);
}

void
DrawTargetOffset::SetPermitSubpixelAA(bool aPermitSubpixelAA)
{
  mDrawTarget->SetPermitSubpixelAA(aPermitSubpixelAA);
}

void
DrawTargetOffset::DrawSurface(SourceSurface* aSurface, const Rect& aDest, const Rect& aSource, const DrawSurfaceOptions& aSurfaceOptions, const DrawOptions& aDrawOptions)
{
  mDrawTarget->DrawSurface(aSurface, aDest, aSource, aSurfaceOptions, aDrawOptions);
}

void
DrawTargetOffset::FillRect(const Rect& aRect, const Pattern& aPattern, const DrawOptions& aDrawOptions)
{
  mDrawTarget->FillRect(aRect, aPattern, aDrawOptions);
}

void
DrawTargetOffset::Stroke(const Path* aPath, const Pattern& aPattern, const StrokeOptions& aStrokeOptions, const DrawOptions& aDrawOptions)
{
  mDrawTarget->Stroke(aPath, aPattern, aStrokeOptions, aDrawOptions);
}

void
DrawTargetOffset::StrokeRect(const Rect& aRect, const Pattern& aPattern, const StrokeOptions &aStrokeOptions, const DrawOptions& aDrawOptions)
{
  mDrawTarget->StrokeRect(aRect, aPattern, aStrokeOptions, aDrawOptions);
}

void
DrawTargetOffset::StrokeLine(const Point& aStart, const Point& aEnd, const Pattern& aPattern, const StrokeOptions &aStrokeOptions, const DrawOptions& aDrawOptions)
{
  mDrawTarget->StrokeLine(aStart, aEnd, aPattern, aStrokeOptions, aDrawOptions);
}

void
DrawTargetOffset::Fill(const Path* aPath, const Pattern& aPattern, const DrawOptions& aDrawOptions)
{
  mDrawTarget->Fill(aPath, aPattern, aDrawOptions);
}

void
DrawTargetOffset::PushLayer(bool aOpaque, Float aOpacity, SourceSurface* aMask,
                           const Matrix& aMaskTransform, const IntRect& aBounds,
                           bool aCopyBackground)
{
  IntRect bounds = aBounds - mOrigin;

  mDrawTarget->PushLayer(aOpaque, aOpacity, aMask, aMaskTransform, bounds, aCopyBackground);
  SetPermitSubpixelAA(mDrawTarget->GetPermitSubpixelAA());
}

void
DrawTargetOffset::PushLayerWithBlend(bool aOpaque, Float aOpacity,
                                    SourceSurface* aMask,
                                    const Matrix& aMaskTransform,
                                    const IntRect& aBounds,
                                    bool aCopyBackground,
                                    CompositionOp aOp)
{
  IntRect bounds = aBounds - mOrigin;

  mDrawTarget->PushLayerWithBlend(aOpaque, aOpacity, aMask, aMaskTransform, bounds, aCopyBackground, aOp);
  SetPermitSubpixelAA(mDrawTarget->GetPermitSubpixelAA());
}

void
DrawTargetOffset::PopLayer()
{
  mDrawTarget->PopLayer();
  SetPermitSubpixelAA(mDrawTarget->GetPermitSubpixelAA());
}

} // namespace gfx
} // namespace mozilla