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/* -*- Mode: C++; tab-width: 4; 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 "WindowSurfaceX11Image.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/Tools.h"
#include "mozilla/gfx/gfxVars.h"
#include "gfxPlatform.h"
#include "gfx2DGlue.h"
#include <X11/extensions/shape.h>
namespace mozilla {
namespace widget {
using namespace mozilla::gfx;
// gfxImageSurface pixel format configuration.
#define SHAPED_IMAGE_SURFACE_BPP 4
#ifdef IS_BIG_ENDIAN
# define SHAPED_IMAGE_SURFACE_ALPHA_INDEX 0
#else
# define SHAPED_IMAGE_SURFACE_ALPHA_INDEX 3
#endif
WindowSurfaceX11Image::WindowSurfaceX11Image(Display* aDisplay, Window aWindow,
Visual* aVisual,
unsigned int aDepth,
bool aIsShaped)
: WindowSurfaceX11(aDisplay, aWindow, aVisual, aDepth),
mTransparencyBitmap(nullptr),
mTransparencyBitmapWidth(0),
mTransparencyBitmapHeight(0),
mIsShaped(aIsShaped) {}
WindowSurfaceX11Image::~WindowSurfaceX11Image() {
if (mTransparencyBitmap) {
delete[] mTransparencyBitmap;
Display* xDisplay = mWindowSurface->XDisplay();
Window xDrawable = mWindowSurface->XDrawable();
XShapeCombineMask(xDisplay, xDrawable, ShapeBounding, 0, 0, X11None,
ShapeSet);
}
}
already_AddRefed<gfx::DrawTarget> WindowSurfaceX11Image::Lock(
const LayoutDeviceIntRegion& aRegion) {
gfx::IntRect bounds = aRegion.GetBounds().ToUnknownRect();
gfx::IntSize size(bounds.XMost(), bounds.YMost());
if (!mWindowSurface || mWindowSurface->CairoStatus() ||
!(size <= mWindowSurface->GetSize())) {
mWindowSurface = new gfxXlibSurface(mDisplay, mWindow, mVisual, size);
}
if (mWindowSurface->CairoStatus()) {
return nullptr;
}
if (!mImageSurface || mImageSurface->CairoStatus() ||
!(size <= mImageSurface->GetSize())) {
gfxImageFormat format = SurfaceFormatToImageFormat(mFormat);
if (format == gfx::SurfaceFormat::UNKNOWN) {
format = mDepth == 32 ? gfx::SurfaceFormat::A8R8G8B8_UINT32
: gfx::SurfaceFormat::X8R8G8B8_UINT32;
}
// Use alpha image format for shaped window as we derive
// the shape bitmap from alpha channel. Must match SHAPED_IMAGE_SURFACE_BPP
// and SHAPED_IMAGE_SURFACE_ALPHA_INDEX.
if (mIsShaped) {
format = gfx::SurfaceFormat::A8R8G8B8_UINT32;
}
mImageSurface = new gfxImageSurface(size, format);
if (mImageSurface->CairoStatus()) {
return nullptr;
}
}
gfxImageFormat format = mImageSurface->Format();
// Cairo prefers compositing to BGRX instead of BGRA where possible.
// Cairo/pixman lacks some fast paths for compositing BGRX onto BGRA, so
// just report it as BGRX directly in that case.
// Otherwise, for Skia, report it as BGRA to the compositor. The alpha
// channel will be discarded when we put the image.
if (format == gfx::SurfaceFormat::X8R8G8B8_UINT32) {
gfx::BackendType backend = gfxVars::ContentBackend();
if (!gfx::Factory::DoesBackendSupportDataDrawtarget(backend)) {
backend = gfx::BackendType::SKIA;
}
if (backend != gfx::BackendType::CAIRO) {
format = gfx::SurfaceFormat::A8R8G8B8_UINT32;
}
}
return gfxPlatform::CreateDrawTargetForData(
mImageSurface->Data(), mImageSurface->GetSize(), mImageSurface->Stride(),
ImageFormatToSurfaceFormat(format));
}
// The transparency bitmap routines are derived form the ones at nsWindow.cpp.
// The difference here is that we compose to RGBA image and then create
// the shape mask from final image alpha channel.
static inline int32_t GetBitmapStride(int32_t width) { return (width + 7) / 8; }
static bool ChangedMaskBits(gchar* aMaskBits, int32_t aMaskWidth,
int32_t aMaskHeight, const nsIntRect& aRect,
uint8_t* aImageData) {
int32_t stride = aMaskWidth * SHAPED_IMAGE_SURFACE_BPP;
int32_t x, y, xMax = aRect.XMost(), yMax = aRect.YMost();
int32_t maskBytesPerRow = GetBitmapStride(aMaskWidth);
for (y = aRect.y; y < yMax; y++) {
gchar* maskBytes = aMaskBits + y * maskBytesPerRow;
uint8_t* alphas = aImageData;
for (x = aRect.x; x < xMax; x++) {
bool newBit = *(alphas + SHAPED_IMAGE_SURFACE_ALPHA_INDEX) > 0x7f;
alphas += SHAPED_IMAGE_SURFACE_BPP;
gchar maskByte = maskBytes[x >> 3];
bool maskBit = (maskByte & (1 << (x & 7))) != 0;
if (maskBit != newBit) {
return true;
}
}
aImageData += stride;
}
return false;
}
static void UpdateMaskBits(gchar* aMaskBits, int32_t aMaskWidth,
int32_t aMaskHeight, const nsIntRect& aRect,
uint8_t* aImageData) {
int32_t stride = aMaskWidth * SHAPED_IMAGE_SURFACE_BPP;
int32_t x, y, xMax = aRect.XMost(), yMax = aRect.YMost();
int32_t maskBytesPerRow = GetBitmapStride(aMaskWidth);
for (y = aRect.y; y < yMax; y++) {
gchar* maskBytes = aMaskBits + y * maskBytesPerRow;
uint8_t* alphas = aImageData;
for (x = aRect.x; x < xMax; x++) {
bool newBit = *(alphas + SHAPED_IMAGE_SURFACE_ALPHA_INDEX) > 0x7f;
alphas += SHAPED_IMAGE_SURFACE_BPP;
gchar mask = 1 << (x & 7);
gchar maskByte = maskBytes[x >> 3];
// Note: '-newBit' turns 0 into 00...00 and 1 into 11...11
maskBytes[x >> 3] = (maskByte & ~mask) | (-newBit & mask);
}
aImageData += stride;
}
}
void WindowSurfaceX11Image::ResizeTransparencyBitmap(int aWidth, int aHeight) {
int32_t actualSize =
GetBitmapStride(mTransparencyBitmapWidth) * mTransparencyBitmapHeight;
int32_t newSize = GetBitmapStride(aWidth) * aHeight;
if (actualSize < newSize) {
delete[] mTransparencyBitmap;
mTransparencyBitmap = new gchar[newSize];
}
mTransparencyBitmapWidth = aWidth;
mTransparencyBitmapHeight = aHeight;
}
void WindowSurfaceX11Image::ApplyTransparencyBitmap() {
gfx::IntSize size = mWindowSurface->GetSize();
bool maskChanged = true;
if (!mTransparencyBitmap) {
mTransparencyBitmapWidth = size.width;
mTransparencyBitmapHeight = size.height;
int32_t byteSize =
GetBitmapStride(mTransparencyBitmapWidth) * mTransparencyBitmapHeight;
mTransparencyBitmap = new gchar[byteSize];
} else {
bool sizeChanged = (size.width != mTransparencyBitmapWidth ||
size.height != mTransparencyBitmapHeight);
if (sizeChanged) {
ResizeTransparencyBitmap(size.width, size.height);
} else {
maskChanged = ChangedMaskBits(
mTransparencyBitmap, mTransparencyBitmapWidth,
mTransparencyBitmapHeight, nsIntRect(0, 0, size.width, size.height),
(uint8_t*)mImageSurface->Data());
}
}
if (maskChanged) {
UpdateMaskBits(mTransparencyBitmap, mTransparencyBitmapWidth,
mTransparencyBitmapHeight,
nsIntRect(0, 0, size.width, size.height),
(uint8_t*)mImageSurface->Data());
// We use X11 calls where possible, because GDK handles expose events
// for shaped windows in a way that's incompatible with us (Bug 635903).
// It doesn't occur when the shapes are set through X.
Display* xDisplay = mWindowSurface->XDisplay();
Window xDrawable = mWindowSurface->XDrawable();
Pixmap maskPixmap = XCreateBitmapFromData(
xDisplay, xDrawable, mTransparencyBitmap, mTransparencyBitmapWidth,
mTransparencyBitmapHeight);
XShapeCombineMask(xDisplay, xDrawable, ShapeBounding, 0, 0, maskPixmap,
ShapeSet);
XFreePixmap(xDisplay, maskPixmap);
}
}
void WindowSurfaceX11Image::Commit(
const LayoutDeviceIntRegion& aInvalidRegion) {
RefPtr<gfx::DrawTarget> dt = gfx::Factory::CreateDrawTargetForCairoSurface(
mWindowSurface->CairoSurface(), mWindowSurface->GetSize());
RefPtr<gfx::SourceSurface> surf =
gfx::Factory::CreateSourceSurfaceForCairoSurface(
mImageSurface->CairoSurface(), mImageSurface->GetSize(),
mImageSurface->Format());
if (!dt || !surf) {
return;
}
gfx::IntRect bounds = aInvalidRegion.GetBounds().ToUnknownRect();
if (bounds.IsEmpty()) {
return;
}
if (mIsShaped) {
ApplyTransparencyBitmap();
}
uint32_t numRects = aInvalidRegion.GetNumRects();
if (numRects == 1) {
dt->CopySurface(surf, bounds, bounds.TopLeft());
} else {
AutoTArray<IntRect, 32> rects;
rects.SetCapacity(numRects);
for (auto iter = aInvalidRegion.RectIter(); !iter.Done(); iter.Next()) {
rects.AppendElement(iter.Get().ToUnknownRect());
}
dt->PushDeviceSpaceClipRects(rects.Elements(), rects.Length());
dt->DrawSurface(surf, gfx::Rect(bounds), gfx::Rect(bounds),
DrawSurfaceOptions(),
DrawOptions(1.0f, CompositionOp::OP_SOURCE));
dt->PopClip();
}
}
} // namespace widget
} // namespace mozilla