DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (72ee4800d415)

VCS Links

DrawingCallbackFromDrawable

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * 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 "gfxDrawable.h"
#include "gfxASurface.h"
#include "gfxContext.h"
#include "gfxPlatform.h"
#include "gfx2DGlue.h"
#ifdef MOZ_X11
#include "cairo.h"
#include "gfxXlibSurface.h"
#endif
#include "mozilla/gfx/Logging.h"

using namespace mozilla;
using namespace mozilla::gfx;

gfxSurfaceDrawable::gfxSurfaceDrawable(SourceSurface* aSurface,
                                       const IntSize aSize,
                                       const gfxMatrix aTransform)
 : gfxDrawable(aSize)
 , mSourceSurface(aSurface)
 , mTransform(aTransform)
{
  if (!mSourceSurface) {
    gfxWarning() << "Creating gfxSurfaceDrawable with null SourceSurface";
  }
}

bool
gfxSurfaceDrawable::DrawWithSamplingRect(DrawTarget* aDrawTarget,
                                         CompositionOp aOp,
                                         AntialiasMode aAntialiasMode,
                                         const gfxRect& aFillRect,
                                         const gfxRect& aSamplingRect,
                                         ExtendMode aExtendMode,
                                         const SamplingFilter aSamplingFilter,
                                         gfxFloat aOpacity)
{
  if (!mSourceSurface) {
    return true;
  }

  // When drawing with CLAMP we can expand the sampling rect to the nearest pixel
  // without changing the result.
  IntRect intRect = IntRect::RoundOut(aSamplingRect.x, aSamplingRect.y,
                                      aSamplingRect.width, aSamplingRect.height);

  IntSize size = mSourceSurface->GetSize();
  if (!IntRect(IntPoint(), size).Contains(intRect)) {
    return false;
  }

  DrawInternal(aDrawTarget, aOp, aAntialiasMode, aFillRect, intRect,
               ExtendMode::CLAMP, aSamplingFilter, aOpacity, gfxMatrix());
  return true;
}

bool
gfxSurfaceDrawable::Draw(gfxContext* aContext,
                         const gfxRect& aFillRect,
                         ExtendMode aExtendMode,
                         const SamplingFilter aSamplingFilter,
                         gfxFloat aOpacity,
                         const gfxMatrix& aTransform)

{
  if (!mSourceSurface) {
    return true;
  }

  DrawInternal(aContext->GetDrawTarget(), aContext->CurrentOp(),
               aContext->CurrentAntialiasMode(), aFillRect, IntRect(),
               aExtendMode, aSamplingFilter, aOpacity, aTransform);
  return true;
}

void
gfxSurfaceDrawable::DrawInternal(DrawTarget* aDrawTarget,
                                 CompositionOp aOp,
                                 AntialiasMode aAntialiasMode,
                                 const gfxRect& aFillRect,
                                 const IntRect& aSamplingRect,
                                 ExtendMode aExtendMode,
                                 const SamplingFilter aSamplingFilter,
                                 gfxFloat aOpacity,
                                 const gfxMatrix& aTransform)
{
    Matrix patternTransform = ToMatrix(aTransform * mTransform);
    patternTransform.Invert();

    SurfacePattern pattern(mSourceSurface, aExtendMode,
                           patternTransform, aSamplingFilter, aSamplingRect);

    Rect fillRect = ToRect(aFillRect);

    if (aOp == CompositionOp::OP_SOURCE && aOpacity == 1.0) {
        // Emulate cairo operator source which is bound by mask!
        aDrawTarget->ClearRect(fillRect);
        aDrawTarget->FillRect(fillRect, pattern);
    } else {
        aDrawTarget->FillRect(fillRect, pattern,
                              DrawOptions(aOpacity, aOp, aAntialiasMode));
    }
}

gfxCallbackDrawable::gfxCallbackDrawable(gfxDrawingCallback* aCallback,
                                         const IntSize aSize)
 : gfxDrawable(aSize)
 , mCallback(aCallback)
{
}

already_AddRefed<gfxSurfaceDrawable>
gfxCallbackDrawable::MakeSurfaceDrawable(gfxContext *aContext, const SamplingFilter aSamplingFilter)
{
    SurfaceFormat format =
        gfxPlatform::GetPlatform()->Optimal2DFormatForContent(gfxContentType::COLOR_ALPHA);
    RefPtr<DrawTarget> dt =
        aContext->GetDrawTarget()->CreateSimilarDrawTarget(mSize, format);

    if (!dt || !dt->IsValid())
        return nullptr;

    RefPtr<gfxContext> ctx = gfxContext::CreateOrNull(dt);
    MOZ_ASSERT(ctx); // already checked for target above
    Draw(ctx, gfxRect(0, 0, mSize.width, mSize.height), ExtendMode::CLAMP,
         aSamplingFilter);

    RefPtr<SourceSurface> surface = dt->Snapshot();
    if (surface) {
        RefPtr<gfxSurfaceDrawable> drawable = new gfxSurfaceDrawable(surface, mSize);
        return drawable.forget();
    }
    return nullptr;
}

static bool
IsRepeatingExtendMode(ExtendMode aExtendMode)
{
  switch (aExtendMode) {
  case ExtendMode::REPEAT:
  case ExtendMode::REPEAT_X:
  case ExtendMode::REPEAT_Y:
    return true;
  default:
    return false;
  }
}

bool
gfxCallbackDrawable::Draw(gfxContext* aContext,
                          const gfxRect& aFillRect,
                          ExtendMode aExtendMode,
                          const SamplingFilter aSamplingFilter,
                          gfxFloat aOpacity,
                          const gfxMatrix& aTransform)
{
    if ((IsRepeatingExtendMode(aExtendMode) || aOpacity != 1.0 || aContext->CurrentOp() != CompositionOp::OP_OVER) &&
        !mSurfaceDrawable) {
        mSurfaceDrawable = MakeSurfaceDrawable(aContext, aSamplingFilter);
    }

    if (mSurfaceDrawable)
        return mSurfaceDrawable->Draw(aContext, aFillRect, aExtendMode,
                                      aSamplingFilter,
                                      aOpacity, aTransform);

    if (mCallback)
        return (*mCallback)(aContext, aFillRect, aSamplingFilter, aTransform);

    return false;
}

gfxPatternDrawable::gfxPatternDrawable(gfxPattern* aPattern,
                                       const IntSize aSize)
 : gfxDrawable(aSize)
 , mPattern(aPattern)
{
}

gfxPatternDrawable::~gfxPatternDrawable() = default;

class DrawingCallbackFromDrawable : public gfxDrawingCallback {
public:
    explicit DrawingCallbackFromDrawable(gfxDrawable* aDrawable)
     : mDrawable(aDrawable) {
        NS_ASSERTION(aDrawable, "aDrawable is null!");
    }

    ~DrawingCallbackFromDrawable() override = default;

    bool operator()(gfxContext* aContext,
                    const gfxRect& aFillRect,
                    const SamplingFilter aSamplingFilter,
                    const gfxMatrix& aTransform = gfxMatrix()) override
    {
        return mDrawable->Draw(aContext, aFillRect, ExtendMode::CLAMP,
                               aSamplingFilter, 1.0,
                               aTransform);
    }
private:
    RefPtr<gfxDrawable> mDrawable;
};

already_AddRefed<gfxCallbackDrawable>
gfxPatternDrawable::MakeCallbackDrawable()
{
    RefPtr<gfxDrawingCallback> callback =
        new DrawingCallbackFromDrawable(this);
    RefPtr<gfxCallbackDrawable> callbackDrawable =
        new gfxCallbackDrawable(callback, mSize);
    return callbackDrawable.forget();
}

bool
gfxPatternDrawable::Draw(gfxContext* aContext,
                         const gfxRect& aFillRect,
                         ExtendMode aExtendMode,
                         const SamplingFilter aSamplingFilter,
                         gfxFloat aOpacity,
                         const gfxMatrix& aTransform)
{
    DrawTarget& aDrawTarget = *aContext->GetDrawTarget();

    if (!mPattern)
        return false;

    if (IsRepeatingExtendMode(aExtendMode)) {
        // We can't use mPattern directly: We want our repeated tiles to have
        // the size mSize, which might not be the case in mPattern.
        // So we need to draw mPattern into a surface of size mSize, create
        // a pattern from the surface and draw that pattern.
        // gfxCallbackDrawable and gfxSurfaceDrawable already know how to do
        // those things, so we use them here. Drawing mPattern into the surface
        // will happen through this Draw() method with aRepeat = false.
        RefPtr<gfxCallbackDrawable> callbackDrawable = MakeCallbackDrawable();
        return callbackDrawable->Draw(aContext, aFillRect, aExtendMode,
                                      aSamplingFilter,
                                      aOpacity, aTransform);
    }

    gfxMatrix oldMatrix = mPattern->GetMatrix();
    mPattern->SetMatrix(aTransform * oldMatrix);
    DrawOptions drawOptions(aOpacity);
    aDrawTarget.FillRect(ToRect(aFillRect),
                         *mPattern->GetPattern(&aDrawTarget), drawOptions);
    mPattern->SetMatrix(oldMatrix);
    return true;
}