mirror of
https://github.com/classilla/tenfourfox.git
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199 lines
5.9 KiB
C++
199 lines
5.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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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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#if defined(MOZ_WIDGET_GTK)
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#include <gtk/gtk.h>
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#include <gdk/gdkx.h>
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#elif defined(MOZ_WIDGET_QT)
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#include <QWindow>
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#endif
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#include "nsShmImage.h"
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#ifdef MOZ_WIDGET_GTK
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#include "gfxPlatformGtk.h"
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#endif
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#ifdef MOZ_HAVE_SHMIMAGE
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using namespace mozilla::ipc;
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using namespace mozilla::gfx;
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// If XShm isn't available to our client, we'll try XShm once, fail,
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// set this to false and then never try again.
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static bool gShmAvailable = true;
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bool nsShmImage::UseShm()
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{
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#ifdef MOZ_WIDGET_GTK
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return (gShmAvailable && !gfxPlatformGtk::GetPlatform()->UseXRender());
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#else
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return gShmAvailable;
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#endif
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}
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#ifdef MOZ_WIDGET_GTK
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static int gShmError = 0;
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static int
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TrapShmError(Display* aDisplay, XErrorEvent* aEvent)
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{
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// store the error code and ignore the error
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gShmError = aEvent->error_code;
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return 0;
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}
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#endif
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already_AddRefed<nsShmImage>
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nsShmImage::Create(const IntSize& aSize,
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Display* aDisplay, Visual* aVisual, unsigned int aDepth)
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{
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RefPtr<nsShmImage> shm = new nsShmImage();
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shm->mDisplay = aDisplay;
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shm->mImage = XShmCreateImage(aDisplay, aVisual, aDepth,
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ZPixmap, nullptr,
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&(shm->mInfo),
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aSize.width, aSize.height);
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if (!shm->mImage) {
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return nullptr;
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}
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size_t size = SharedMemory::PageAlignedSize(
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shm->mImage->bytes_per_line * shm->mImage->height);
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shm->mSegment = new SharedMemorySysV();
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if (!shm->mSegment->Create(size) || !shm->mSegment->Map(size)) {
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return nullptr;
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}
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shm->mInfo.shmid = shm->mSegment->GetHandle();
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shm->mInfo.shmaddr =
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shm->mImage->data = static_cast<char*>(shm->mSegment->memory());
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shm->mInfo.readOnly = False;
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#if defined(MOZ_WIDGET_GTK)
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gShmError = 0;
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XErrorHandler previousHandler = XSetErrorHandler(TrapShmError);
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Status attachOk = XShmAttach(aDisplay, &shm->mInfo);
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XSync(aDisplay, False);
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XSetErrorHandler(previousHandler);
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if (gShmError) {
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attachOk = 0;
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}
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#elif defined(MOZ_WIDGET_QT)
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Status attachOk = XShmAttach(aDisplay, &shm->mInfo);
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#endif
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if (!attachOk) {
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// Assume XShm isn't available, and don't attempt to use it
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// again.
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gShmAvailable = false;
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return nullptr;
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}
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shm->mXAttached = true;
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shm->mSize = aSize;
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switch (shm->mImage->depth) {
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case 32:
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if ((shm->mImage->red_mask == 0xff0000) &&
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(shm->mImage->green_mask == 0xff00) &&
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(shm->mImage->blue_mask == 0xff)) {
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shm->mFormat = SurfaceFormat::B8G8R8A8;
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break;
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}
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goto unsupported;
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case 24:
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// Only xRGB is supported.
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if ((shm->mImage->red_mask == 0xff0000) &&
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(shm->mImage->green_mask == 0xff00) &&
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(shm->mImage->blue_mask == 0xff)) {
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shm->mFormat = SurfaceFormat::B8G8R8X8;
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break;
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}
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goto unsupported;
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case 16:
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shm->mFormat = SurfaceFormat::R5G6B5_UINT16;
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break;
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unsupported:
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default:
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NS_WARNING("Unsupported XShm Image format!");
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gShmAvailable = false;
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return nullptr;
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}
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return shm.forget();
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}
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already_AddRefed<DrawTarget>
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nsShmImage::CreateDrawTarget()
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{
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return gfxPlatform::GetPlatform()->CreateDrawTargetForData(
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static_cast<unsigned char*>(mSegment->memory()),
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mSize,
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mImage->bytes_per_line,
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mFormat);
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}
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#ifdef MOZ_WIDGET_GTK
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void
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nsShmImage::Put(Display* aDisplay, Drawable aWindow, const nsIntRegion& aRegion)
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{
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GC gc = XCreateGC(aDisplay, aWindow, 0, nullptr);
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nsIntRegion bounded;
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bounded.And(aRegion, nsIntRect(0, 0, mImage->width, mImage->height));
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nsIntRegionRectIterator iter(bounded);
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for (const nsIntRect *r = iter.Next(); r; r = iter.Next()) {
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XShmPutImage(aDisplay, aWindow, gc, mImage,
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r->x, r->y,
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r->x, r->y,
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r->width, r->height,
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False);
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}
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XFreeGC(aDisplay, gc);
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// FIXME/bug 597336: we need to ensure that the shm image isn't
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// scribbled over before all its pending XShmPutImage()s complete.
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// However, XSync() is an unnecessarily heavyweight
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// synchronization mechanism; other options are possible. If this
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// XSync is shown to hurt responsiveness, we need to explore the
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// other options.
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XSync(aDisplay, False);
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}
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#elif defined(MOZ_WIDGET_QT)
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void
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nsShmImage::Put(QWindow* aWindow, QRect& aRect)
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{
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Display* dpy = gfxQtPlatform::GetXDisplay(aWindow);
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Drawable d = aWindow->winId();
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GC gc = XCreateGC(dpy, d, 0, nullptr);
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// Avoid out of bounds painting
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QRect inter = aRect.intersected(aWindow->geometry());
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XShmPutImage(dpy, d, gc, mImage,
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inter.x(), inter.y(),
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inter.x(), inter.y(),
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inter.width(), inter.height(),
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False);
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XFreeGC(dpy, gc);
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}
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#endif
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already_AddRefed<DrawTarget>
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nsShmImage::EnsureShmImage(const IntSize& aSize,
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Display* aDisplay, Visual* aVisual, unsigned int aDepth,
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RefPtr<nsShmImage>& aImage)
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{
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if (!aImage || aImage->Size() != aSize) {
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// Because we XSync() after XShmAttach() to trap errors, we
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// know that the X server has the old image's memory mapped
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// into its address space, so it's OK to destroy the old image
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// here even if there are outstanding Puts. The Detach is
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// ordered after the Puts.
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aImage = nsShmImage::Create(aSize, aDisplay, aVisual, aDepth);
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}
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return !aImage ? nullptr : aImage->CreateDrawTarget();
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}
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#endif // defined(MOZ_X11) && defined(MOZ_HAVE_SHAREDMEMORYSYSV)
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