1 files changed, 326 insertions, 0 deletions
diff --git a/gfx/thebes/gfxImageSurface.cpp b/gfx/thebes/gfxImageSurface.cpp
new file mode 100644
index 0000000000..3cd285dac7
--- /dev/null
+++ b/gfx/thebes/gfxImageSurface.cpp
@@ -0,0 +1,326 @@
+/* -*- 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 "mozilla/MemoryReporting.h"
+#if defined(HAVE_POSIX_MEMALIGN)
+#  include "gfxAlphaRecovery.h"
+#endif
+#include "gfxImageSurface.h"
+
+#include "cairo.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/gfx/HelpersCairo.h"
+#include "gfx2DGlue.h"
+#include <algorithm>
+
+using namespace mozilla;
+using namespace mozilla::gfx;
+
+gfxImageSurface::gfxImageSurface()
+    : mSize(0, 0),
+      mOwnsData(false),
+      mData(nullptr),
+      mFormat(SurfaceFormat::UNKNOWN),
+      mStride(0) {}
+
+void gfxImageSurface::InitFromSurface(cairo_surface_t* csurf) {
+  if (!csurf || cairo_surface_status(csurf)) {
+    MakeInvalid();
+    return;
+  }
+
+  mSize.width = cairo_image_surface_get_width(csurf);
+  mSize.height = cairo_image_surface_get_height(csurf);
+  mData = cairo_image_surface_get_data(csurf);
+  mFormat = CairoFormatToGfxFormat(cairo_image_surface_get_format(csurf));
+  mOwnsData = false;
+  mStride = cairo_image_surface_get_stride(csurf);
+
+  Init(csurf, true);
+}
+
+gfxImageSurface::gfxImageSurface(unsigned char* aData, const IntSize& aSize,
+                                 long aStride, gfxImageFormat aFormat) {
+  InitWithData(aData, aSize, aStride, aFormat);
+}
+
+void gfxImageSurface::MakeInvalid() {
+  mSize = IntSize(-1, -1);
+  mData = nullptr;
+  mStride = 0;
+}
+
+void gfxImageSurface::InitWithData(unsigned char* aData, const IntSize& aSize,
+                                   long aStride, gfxImageFormat aFormat) {
+  mSize = aSize;
+  mOwnsData = false;
+  mData = aData;
+  mFormat = aFormat;
+  mStride = aStride;
+
+  if (!Factory::CheckSurfaceSize(aSize)) MakeInvalid();
+
+  cairo_format_t cformat = GfxFormatToCairoFormat(mFormat);
+  cairo_surface_t* surface = cairo_image_surface_create_for_data(
+      (unsigned char*)mData, cformat, mSize.width, mSize.height, mStride);
+
+  // cairo_image_surface_create_for_data can return a 'null' surface
+  // in out of memory conditions. The gfxASurface::Init call checks
+  // the surface it receives to see if there is an error with the
+  // surface and handles it appropriately. That is why there is
+  // no check here.
+  Init(surface);
+}
+
+static void* TryAllocAlignedBytes(size_t aSize) {
+  // Use fallible allocators here
+#if defined(HAVE_POSIX_MEMALIGN)
+  void* ptr;
+  // Try to align for fast alpha recovery.  This should only help
+  // cairo too, can't hurt.
+  return posix_memalign(&ptr, 1 << gfxAlphaRecovery::GoodAlignmentLog2(), aSize)
+             ? nullptr
+             : ptr;
+#else
+  // Oh well, hope that luck is with us in the allocator
+  return malloc(aSize);
+#endif
+}
+
+gfxImageSurface::gfxImageSurface(const IntSize& size, gfxImageFormat format,
+                                 bool aClear)
+    : mSize(size), mData(nullptr), mFormat(format) {
+  AllocateAndInit(0, 0, aClear);
+}
+
+void gfxImageSurface::AllocateAndInit(long aStride, int32_t aMinimalAllocation,
+                                      bool aClear) {
+  // The callers should set mSize and mFormat.
+  MOZ_ASSERT(!mData);
+  mData = nullptr;
+  mOwnsData = false;
+
+  mStride = aStride > 0 ? aStride : ComputeStride();
+  if (aMinimalAllocation < mSize.height * mStride)
+    aMinimalAllocation = mSize.height * mStride;
+
+  if (!Factory::CheckSurfaceSize(mSize)) MakeInvalid();
+
+  // if we have a zero-sized surface, just leave mData nullptr
+  if (mSize.height * mStride > 0) {
+    // This can fail to allocate memory aligned as we requested,
+    // or it can fail to allocate any memory at all.
+    mData = (unsigned char*)TryAllocAlignedBytes(aMinimalAllocation);
+    if (!mData) return;
+    if (aClear) memset(mData, 0, aMinimalAllocation);
+  }
+
+  mOwnsData = true;
+
+  cairo_format_t cformat = GfxFormatToCairoFormat(mFormat);
+  cairo_surface_t* surface = cairo_image_surface_create_for_data(
+      (unsigned char*)mData, cformat, mSize.width, mSize.height, mStride);
+
+  Init(surface);
+
+  if (mSurfaceValid) {
+    RecordMemoryUsed(mSize.height * ComputeStride() + sizeof(gfxImageSurface));
+  }
+}
+
+gfxImageSurface::gfxImageSurface(const IntSize& size, gfxImageFormat format,
+                                 long aStride, int32_t aExtraBytes, bool aClear)
+    : mSize(size), mData(nullptr), mFormat(format) {
+  AllocateAndInit(aStride, aExtraBytes, aClear);
+}
+
+gfxImageSurface::gfxImageSurface(cairo_surface_t* csurf) {
+  mSize.width = cairo_image_surface_get_width(csurf);
+  mSize.height = cairo_image_surface_get_height(csurf);
+  mData = cairo_image_surface_get_data(csurf);
+  mFormat = CairoFormatToGfxFormat(cairo_image_surface_get_format(csurf));
+  mOwnsData = false;
+  mStride = cairo_image_surface_get_stride(csurf);
+
+  Init(csurf, true);
+}
+
+gfxImageSurface::~gfxImageSurface() {
+  if (mOwnsData) free(mData);
+}
+
+/*static*/
+long gfxImageSurface::ComputeStride(const IntSize& aSize,
+                                    gfxImageFormat aFormat) {
+  long stride;
+
+  if (aFormat == SurfaceFormat::A8R8G8B8_UINT32)
+    stride = aSize.width * 4;
+  else if (aFormat == SurfaceFormat::X8R8G8B8_UINT32)
+    stride = aSize.width * 4;
+  else if (aFormat == SurfaceFormat::R5G6B5_UINT16)
+    stride = aSize.width * 2;
+  else if (aFormat == SurfaceFormat::A8)
+    stride = aSize.width;
+  else {
+    NS_WARNING("Unknown format specified to gfxImageSurface!");
+    stride = aSize.width * 4;
+  }
+
+  stride = ((stride + 3) / 4) * 4;
+
+  return stride;
+}
+
+size_t gfxImageSurface::SizeOfExcludingThis(
+    mozilla::MallocSizeOf aMallocSizeOf) const {
+  size_t n = gfxASurface::SizeOfExcludingThis(aMallocSizeOf);
+  if (mOwnsData) {
+    n += aMallocSizeOf(mData);
+  }
+  return n;
+}
+
+size_t gfxImageSurface::SizeOfIncludingThis(
+    mozilla::MallocSizeOf aMallocSizeOf) const {
+  return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
+}
+
+bool gfxImageSurface::SizeOfIsMeasured() const { return true; }
+
+// helper function for the CopyFrom methods
+static void CopyForStride(unsigned char* aDest, unsigned char* aSrc,
+                          const IntSize& aSize, long aDestStride,
+                          long aSrcStride) {
+  if (aDestStride == aSrcStride) {
+    memcpy(aDest, aSrc, aSrcStride * aSize.height);
+  } else {
+    int lineSize = std::min(aDestStride, aSrcStride);
+    for (int i = 0; i < aSize.height; i++) {
+      unsigned char* src = aSrc + aSrcStride * i;
+      unsigned char* dst = aDest + aDestStride * i;
+
+      memcpy(dst, src, lineSize);
+    }
+  }
+}
+
+// helper function for the CopyFrom methods
+static bool FormatsAreCompatible(gfxImageFormat a1, gfxImageFormat a2) {
+  if (a1 != a2 &&
+      !(a1 == SurfaceFormat::A8R8G8B8_UINT32 &&
+        a2 == SurfaceFormat::X8R8G8B8_UINT32) &&
+      !(a1 == SurfaceFormat::X8R8G8B8_UINT32 &&
+        a2 == SurfaceFormat::A8R8G8B8_UINT32)) {
+    return false;
+  }
+
+  return true;
+}
+
+bool gfxImageSurface::CopyFrom(SourceSurface* aSurface) {
+  RefPtr<DataSourceSurface> data = aSurface->GetDataSurface();
+
+  if (!data) {
+    return false;
+  }
+
+  IntSize size(data->GetSize().width, data->GetSize().height);
+  if (size != mSize) {
+    return false;
+  }
+
+  if (!FormatsAreCompatible(SurfaceFormatToImageFormat(aSurface->GetFormat()),
+                            mFormat)) {
+    return false;
+  }
+
+  DataSourceSurface::ScopedMap map(data, DataSourceSurface::READ);
+  CopyForStride(mData, map.GetData(), size, mStride, map.GetStride());
+
+  return true;
+}
+
+bool gfxImageSurface::CopyFrom(gfxImageSurface* other) {
+  if (other->mSize != mSize) {
+    return false;
+  }
+
+  if (!FormatsAreCompatible(other->mFormat, mFormat)) {
+    return false;
+  }
+
+  CopyForStride(mData, other->mData, mSize, mStride, other->mStride);
+
+  return true;
+}
+
+bool gfxImageSurface::CopyTo(SourceSurface* aSurface) {
+  RefPtr<DataSourceSurface> data = aSurface->GetDataSurface();
+
+  if (!data) {
+    return false;
+  }
+
+  IntSize size(data->GetSize().width, data->GetSize().height);
+  if (size != mSize) {
+    return false;
+  }
+
+  if (!FormatsAreCompatible(SurfaceFormatToImageFormat(aSurface->GetFormat()),
+                            mFormat)) {
+    return false;
+  }
+
+  DataSourceSurface::ScopedMap map(data, DataSourceSurface::READ_WRITE);
+  CopyForStride(map.GetData(), mData, size, map.GetStride(), mStride);
+
+  return true;
+}
+
+already_AddRefed<DataSourceSurface>
+gfxImageSurface::CopyToB8G8R8A8DataSourceSurface() {
+  RefPtr<DataSourceSurface> dataSurface = Factory::CreateDataSourceSurface(
+      IntSize(GetSize().width, GetSize().height), SurfaceFormat::B8G8R8A8);
+  if (dataSurface) {
+    CopyTo(dataSurface);
+  }
+  return dataSurface.forget();
+}
+
+already_AddRefed<gfxSubimageSurface> gfxImageSurface::GetSubimage(
+    const gfxRect& aRect) {
+  gfxRect r(aRect);
+  r.Round();
+  MOZ_ASSERT(gfxRect(0, 0, mSize.width, mSize.height).Contains(r));
+
+  gfxImageFormat format = Format();
+
+  unsigned char* subData =
+      Data() + (Stride() * (int)r.Y()) +
+      (int)r.X() * gfxASurface::BytePerPixelFromFormat(Format());
+
+  if (format == SurfaceFormat::A8R8G8B8_UINT32 &&
+      GetOpaqueRect().Contains(aRect)) {
+    format = SurfaceFormat::X8R8G8B8_UINT32;
+  }
+
+  RefPtr<gfxSubimageSurface> image = new gfxSubimageSurface(
+      this, subData, IntSize((int)r.Width(), (int)r.Height()), format);
+
+  return image.forget();
+}
+
+gfxSubimageSurface::gfxSubimageSurface(gfxImageSurface* aParent,
+                                       unsigned char* aData,
+                                       const IntSize& aSize,
+                                       gfxImageFormat aFormat)
+    : gfxImageSurface(aData, aSize, aParent->Stride(), aFormat),
+      mParent(aParent) {}
+
+already_AddRefed<gfxImageSurface> gfxImageSurface::GetAsImageSurface() {
+  RefPtr<gfxImageSurface> surface = this;
+  return surface.forget();
+}