mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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347 lines
11 KiB
C++
347 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "gfxAlphaRecovery.h"
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#include "gfxImageSurface.h"
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#include "cairo.h"
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#include "mozilla/gfx/2D.h"
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#include "gfx2DGlue.h"
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using namespace mozilla::gfx;
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gfxImageSurface::gfxImageSurface()
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: mSize(0, 0),
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mOwnsData(false),
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mFormat(ImageFormatUnknown),
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mStride(0)
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{
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}
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void
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gfxImageSurface::InitFromSurface(cairo_surface_t *csurf)
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{
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mSize.width = cairo_image_surface_get_width(csurf);
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mSize.height = cairo_image_surface_get_height(csurf);
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mData = cairo_image_surface_get_data(csurf);
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mFormat = (gfxImageFormat) cairo_image_surface_get_format(csurf);
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mOwnsData = false;
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mStride = cairo_image_surface_get_stride(csurf);
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Init(csurf, true);
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}
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gfxImageSurface::gfxImageSurface(unsigned char *aData, const gfxIntSize& aSize,
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long aStride, gfxImageFormat aFormat)
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{
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InitWithData(aData, aSize, aStride, aFormat);
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}
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void
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gfxImageSurface::MakeInvalid()
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{
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mSize = gfxIntSize(-1, -1);
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mData = NULL;
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mStride = 0;
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}
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void
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gfxImageSurface::InitWithData(unsigned char *aData, const gfxIntSize& aSize,
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long aStride, gfxImageFormat aFormat)
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{
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mSize = aSize;
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mOwnsData = false;
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mData = aData;
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mFormat = aFormat;
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mStride = aStride;
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if (!CheckSurfaceSize(aSize))
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MakeInvalid();
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cairo_surface_t *surface =
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cairo_image_surface_create_for_data((unsigned char*)mData,
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(cairo_format_t)mFormat,
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mSize.width,
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mSize.height,
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mStride);
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// cairo_image_surface_create_for_data can return a 'null' surface
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// in out of memory conditions. The gfxASurface::Init call checks
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// the surface it receives to see if there is an error with the
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// surface and handles it appropriately. That is why there is
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// no check here.
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Init(surface);
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}
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static void*
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TryAllocAlignedBytes(size_t aSize)
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{
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// Use fallible allocators here
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#if defined(HAVE_POSIX_MEMALIGN)
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void* ptr;
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// Try to align for fast alpha recovery. This should only help
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// cairo too, can't hurt.
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return moz_posix_memalign(&ptr,
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1 << gfxAlphaRecovery::GoodAlignmentLog2(),
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aSize) ?
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nullptr : ptr;
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#else
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// Oh well, hope that luck is with us in the allocator
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return moz_malloc(aSize);
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#endif
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}
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gfxImageSurface::gfxImageSurface(const gfxIntSize& size, gfxImageFormat format, bool aClear) :
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mSize(size), mOwnsData(false), mData(nullptr), mFormat(format)
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{
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mStride = ComputeStride();
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if (!CheckSurfaceSize(size))
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MakeInvalid();
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// if we have a zero-sized surface, just leave mData nullptr
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if (mSize.height * mStride > 0) {
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// This can fail to allocate memory aligned as we requested,
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// or it can fail to allocate any memory at all.
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mData = (unsigned char *) TryAllocAlignedBytes(mSize.height * mStride);
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if (!mData)
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return;
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if (aClear)
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memset(mData, 0, mSize.height * mStride);
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}
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mOwnsData = true;
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cairo_surface_t *surface =
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cairo_image_surface_create_for_data((unsigned char*)mData,
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(cairo_format_t)format,
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mSize.width,
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mSize.height,
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mStride);
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Init(surface);
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if (mSurfaceValid) {
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RecordMemoryUsed(mSize.height * ComputeStride() +
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sizeof(gfxImageSurface));
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}
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}
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gfxImageSurface::gfxImageSurface(cairo_surface_t *csurf)
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{
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mSize.width = cairo_image_surface_get_width(csurf);
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mSize.height = cairo_image_surface_get_height(csurf);
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mData = cairo_image_surface_get_data(csurf);
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mFormat = (gfxImageFormat) cairo_image_surface_get_format(csurf);
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mOwnsData = false;
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mStride = cairo_image_surface_get_stride(csurf);
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Init(csurf, true);
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}
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gfxImageSurface::~gfxImageSurface()
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{
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if (mOwnsData)
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free(mData);
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}
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/*static*/ long
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gfxImageSurface::ComputeStride(const gfxIntSize& aSize, gfxImageFormat aFormat)
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{
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long stride;
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if (aFormat == ImageFormatARGB32)
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stride = aSize.width * 4;
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else if (aFormat == ImageFormatRGB24)
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stride = aSize.width * 4;
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else if (aFormat == ImageFormatRGB16_565)
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stride = aSize.width * 2;
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else if (aFormat == ImageFormatA8)
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stride = aSize.width;
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else if (aFormat == ImageFormatA1) {
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stride = (aSize.width + 7) / 8;
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} else {
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NS_WARNING("Unknown format specified to gfxImageSurface!");
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stride = aSize.width * 4;
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}
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stride = ((stride + 3) / 4) * 4;
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return stride;
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}
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// helper function for the CopyFrom methods
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static void
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CopyForStride(unsigned char* aDest, unsigned char* aSrc, const gfxIntSize& aSize, long aDestStride, long aSrcStride)
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{
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if (aDestStride == aSrcStride) {
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memcpy (aDest, aSrc, aSrcStride * aSize.height);
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} else {
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int lineSize = NS_MIN(aDestStride, aSrcStride);
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for (int i = 0; i < aSize.height; i++) {
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unsigned char* src = aSrc + aSrcStride * i;
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unsigned char* dst = aDest + aDestStride * i;
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memcpy (dst, src, lineSize);
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}
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}
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}
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// helper function for the CopyFrom methods
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static bool
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FormatsAreCompatible(gfxASurface::gfxImageFormat a1, gfxASurface::gfxImageFormat a2)
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{
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if (a1 != a2 &&
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!(a1 == gfxASurface::ImageFormatARGB32 &&
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a2 == gfxASurface::ImageFormatRGB24) &&
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!(a1 == gfxASurface::ImageFormatRGB24 &&
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a2 == gfxASurface::ImageFormatARGB32)) {
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return false;
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}
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return true;
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}
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bool
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gfxImageSurface::CopyFrom (SourceSurface *aSurface)
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{
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mozilla::RefPtr<DataSourceSurface> data = aSurface->GetDataSurface();
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if (!data) {
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return false;
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}
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gfxIntSize size(data->GetSize().width, data->GetSize().height);
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if (size != mSize) {
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return false;
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}
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if (!FormatsAreCompatible(SurfaceFormatToImageFormat(aSurface->GetFormat()),
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mFormat)) {
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return false;
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}
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CopyForStride(mData, data->GetData(), size, mStride, data->Stride());
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return true;
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}
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bool
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gfxImageSurface::CopyFrom(gfxImageSurface *other)
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{
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if (other->mSize != mSize) {
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return false;
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}
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if (!FormatsAreCompatible(other->mFormat, mFormat)) {
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return false;
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}
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CopyForStride(mData, other->mData, mSize, mStride, other->mStride);
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return true;
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}
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already_AddRefed<gfxSubimageSurface>
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gfxImageSurface::GetSubimage(const gfxRect& aRect)
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{
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gfxRect r(aRect);
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r.Round();
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unsigned char* subData = Data() +
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(Stride() * (int)r.Y()) +
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(int)r.X() * gfxASurface::BytePerPixelFromFormat(Format());
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nsRefPtr<gfxSubimageSurface> image =
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new gfxSubimageSurface(this, subData,
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gfxIntSize((int)r.Width(), (int)r.Height()));
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return image.forget().get();
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}
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gfxSubimageSurface::gfxSubimageSurface(gfxImageSurface* aParent,
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unsigned char* aData,
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const gfxIntSize& aSize)
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: gfxImageSurface(aData, aSize, aParent->Stride(), aParent->Format())
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, mParent(aParent)
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{
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}
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already_AddRefed<gfxImageSurface>
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gfxImageSurface::GetAsImageSurface()
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{
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nsRefPtr<gfxImageSurface> surface = this;
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return surface.forget();
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}
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void
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gfxImageSurface::MovePixels(const nsIntRect& aSourceRect,
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const nsIntPoint& aDestTopLeft)
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{
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const nsIntRect bounds(0, 0, mSize.width, mSize.height);
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nsIntPoint offset = aDestTopLeft - aSourceRect.TopLeft();
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nsIntRect clippedSource = aSourceRect;
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clippedSource.IntersectRect(clippedSource, bounds);
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nsIntRect clippedDest = clippedSource + offset;
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clippedDest.IntersectRect(clippedDest, bounds);
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const nsIntRect dest = clippedDest;
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const nsIntRect source = dest - offset;
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// NB: this relies on IntersectRect() and operator+/- preserving
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// x/y for empty rectangles
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NS_ABORT_IF_FALSE(bounds.Contains(dest) && bounds.Contains(source) &&
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aSourceRect.Contains(source) &&
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nsIntRect(aDestTopLeft, aSourceRect.Size()).Contains(dest) &&
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source.Size() == dest.Size() &&
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offset == (dest.TopLeft() - source.TopLeft()),
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"Messed up clipping, crash or corruption will follow");
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if (source.IsEmpty() || source.IsEqualInterior(dest)) {
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return;
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}
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long naturalStride = ComputeStride(mSize, mFormat);
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if (mStride == naturalStride && dest.width == bounds.width) {
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// Fast path: this is a vertical shift of some rows in a
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// "normal" image surface. We can directly memmove and
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// hopefully stay in SIMD land.
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unsigned char* dst = mData + dest.y * mStride;
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const unsigned char* src = mData + source.y * mStride;
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size_t nBytes = dest.height * mStride;
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memmove(dst, src, nBytes);
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return;
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}
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// Slow(er) path: have to move row-by-row.
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const int32_t bpp = BytePerPixelFromFormat(mFormat);
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const size_t nRowBytes = dest.width * bpp;
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// dstRow points at the first pixel within the current destination
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// row, and similarly for srcRow. endSrcRow is one row beyond the
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// last row we need to copy. stride is either +mStride or
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// -mStride, depending on which direction we're copying.
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unsigned char* dstRow;
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unsigned char* srcRow;
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unsigned char* endSrcRow; // NB: this may point outside the image
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long stride;
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if (dest.y > source.y) {
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// We're copying down from source to dest, so walk backwards
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// starting from the last rows to avoid stomping pixels we
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// need.
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stride = -mStride;
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dstRow = mData + dest.x * bpp + (dest.YMost() - 1) * mStride;
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srcRow = mData + source.x * bpp + (source.YMost() - 1) * mStride;
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endSrcRow = mData + source.x * bpp + (source.y - 1) * mStride;
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} else {
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stride = mStride;
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dstRow = mData + dest.x * bpp + dest.y * mStride;
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srcRow = mData + source.x * bpp + source.y * mStride;
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endSrcRow = mData + source.x * bpp + source.YMost() * mStride;
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}
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for (; srcRow != endSrcRow; dstRow += stride, srcRow += stride) {
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memmove(dstRow, srcRow, nRowBytes);
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}
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}
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