diff options
Diffstat (limited to 'widget/gtk/WindowSurfaceX11Image.cpp')
| -rw-r--r-- | widget/gtk/WindowSurfaceX11Image.cpp | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/widget/gtk/WindowSurfaceX11Image.cpp b/widget/gtk/WindowSurfaceX11Image.cpp new file mode 100644 index 0000000000..f83b64336c --- /dev/null +++ b/widget/gtk/WindowSurfaceX11Image.cpp @@ -0,0 +1,254 @@ +/* -*- 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; + } +} + +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 |