1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/widget/shared/nsShmImage.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,212 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
1.5 + *
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#if defined(MOZ_WIDGET_GTK)
1.11 +#include <gtk/gtk.h>
1.12 +#include <gdk/gdkx.h>
1.13 +#elif defined(MOZ_WIDGET_QT)
1.14 +#include <QWindow>
1.15 +#endif
1.16 +
1.17 +#include "nsShmImage.h"
1.18 +#include "gfxPlatform.h"
1.19 +#include "gfxImageSurface.h"
1.20 +
1.21 +#ifdef MOZ_HAVE_SHMIMAGE
1.22 +
1.23 +using namespace mozilla::ipc;
1.24 +
1.25 +// If XShm isn't available to our client, we'll try XShm once, fail,
1.26 +// set this to false and then never try again.
1.27 +static bool gShmAvailable = true;
1.28 +bool nsShmImage::UseShm()
1.29 +{
1.30 + return gfxPlatform::GetPlatform()->
1.31 + ScreenReferenceSurface()->GetType() == gfxSurfaceType::Image
1.32 + && gShmAvailable;
1.33 +}
1.34 +
1.35 +already_AddRefed<nsShmImage>
1.36 +nsShmImage::Create(const gfxIntSize& aSize,
1.37 + Visual* aVisual, unsigned int aDepth)
1.38 +{
1.39 + Display* dpy = DISPLAY();
1.40 +
1.41 + nsRefPtr<nsShmImage> shm = new nsShmImage();
1.42 + shm->mImage = XShmCreateImage(dpy, aVisual, aDepth,
1.43 + ZPixmap, nullptr,
1.44 + &(shm->mInfo),
1.45 + aSize.width, aSize.height);
1.46 + if (!shm->mImage) {
1.47 + return nullptr;
1.48 + }
1.49 +
1.50 + size_t size = SharedMemory::PageAlignedSize(
1.51 + shm->mImage->bytes_per_line * shm->mImage->height);
1.52 + shm->mSegment = new SharedMemorySysV();
1.53 + if (!shm->mSegment->Create(size) || !shm->mSegment->Map(size)) {
1.54 + return nullptr;
1.55 + }
1.56 +
1.57 + shm->mInfo.shmid = shm->mSegment->GetHandle();
1.58 + shm->mInfo.shmaddr =
1.59 + shm->mImage->data = static_cast<char*>(shm->mSegment->memory());
1.60 + shm->mInfo.readOnly = False;
1.61 +
1.62 + int xerror = 0;
1.63 +#if defined(MOZ_WIDGET_GTK)
1.64 + gdk_error_trap_push();
1.65 + Status attachOk = XShmAttach(dpy, &shm->mInfo);
1.66 + XSync(dpy, False);
1.67 + xerror = gdk_error_trap_pop();
1.68 +#elif defined(MOZ_WIDGET_QT)
1.69 + Status attachOk = XShmAttach(dpy, &shm->mInfo);
1.70 +#endif
1.71 +
1.72 + if (!attachOk || xerror) {
1.73 + // Assume XShm isn't available, and don't attempt to use it
1.74 + // again.
1.75 + gShmAvailable = false;
1.76 + return nullptr;
1.77 + }
1.78 +
1.79 + shm->mXAttached = true;
1.80 + shm->mSize = aSize;
1.81 + switch (shm->mImage->depth) {
1.82 + case 32:
1.83 + if ((shm->mImage->red_mask == 0xff0000) &&
1.84 + (shm->mImage->green_mask == 0xff00) &&
1.85 + (shm->mImage->blue_mask == 0xff)) {
1.86 + shm->mFormat = gfxImageFormat::ARGB32;
1.87 + break;
1.88 + }
1.89 + goto unsupported;
1.90 + case 24:
1.91 + // Only xRGB is supported.
1.92 + if ((shm->mImage->red_mask == 0xff0000) &&
1.93 + (shm->mImage->green_mask == 0xff00) &&
1.94 + (shm->mImage->blue_mask == 0xff)) {
1.95 + shm->mFormat = gfxImageFormat::RGB24;
1.96 + break;
1.97 + }
1.98 + goto unsupported;
1.99 + case 16:
1.100 + shm->mFormat = gfxImageFormat::RGB16_565; break;
1.101 + unsupported:
1.102 + default:
1.103 + NS_WARNING("Unsupported XShm Image format!");
1.104 + gShmAvailable = false;
1.105 + return nullptr;
1.106 + }
1.107 + return shm.forget();
1.108 +}
1.109 +
1.110 +already_AddRefed<gfxASurface>
1.111 +nsShmImage::AsSurface()
1.112 +{
1.113 + return nsRefPtr<gfxASurface>(
1.114 + new gfxImageSurface(static_cast<unsigned char*>(mSegment->memory()),
1.115 + mSize,
1.116 + mImage->bytes_per_line,
1.117 + mFormat)
1.118 + ).forget();
1.119 +}
1.120 +
1.121 +#if (MOZ_WIDGET_GTK == 2)
1.122 +void
1.123 +nsShmImage::Put(GdkWindow* aWindow, GdkRectangle* aRects, GdkRectangle* aEnd)
1.124 +{
1.125 + GdkDrawable* gd;
1.126 + gint dx, dy;
1.127 + gdk_window_get_internal_paint_info(aWindow, &gd, &dx, &dy);
1.128 +
1.129 + Display* dpy = gdk_x11_get_default_xdisplay();
1.130 + Drawable d = GDK_DRAWABLE_XID(gd);
1.131 +
1.132 + GC gc = XCreateGC(dpy, d, 0, nullptr);
1.133 + for (GdkRectangle* r = aRects; r < aEnd; r++) {
1.134 + XShmPutImage(dpy, d, gc, mImage,
1.135 + r->x, r->y,
1.136 + r->x - dx, r->y - dy,
1.137 + r->width, r->height,
1.138 + False);
1.139 + }
1.140 + XFreeGC(dpy, gc);
1.141 +
1.142 + // FIXME/bug 597336: we need to ensure that the shm image isn't
1.143 + // scribbled over before all its pending XShmPutImage()s complete.
1.144 + // However, XSync() is an unnecessarily heavyweight
1.145 + // synchronization mechanism; other options are possible. If this
1.146 + // XSync is shown to hurt responsiveness, we need to explore the
1.147 + // other options.
1.148 + XSync(dpy, False);
1.149 +}
1.150 +
1.151 +#elif (MOZ_WIDGET_GTK == 3)
1.152 +void
1.153 +nsShmImage::Put(GdkWindow* aWindow, cairo_rectangle_list_t* aRects)
1.154 +{
1.155 + Display* dpy = gdk_x11_get_default_xdisplay();
1.156 + Drawable d = GDK_WINDOW_XID(aWindow);
1.157 + int dx = 0, dy = 0;
1.158 +
1.159 + GC gc = XCreateGC(dpy, d, 0, nullptr);
1.160 + cairo_rectangle_t r;
1.161 + for (int i = 0; i < aRects->num_rectangles; i++) {
1.162 + r = aRects->rectangles[i];
1.163 + XShmPutImage(dpy, d, gc, mImage,
1.164 + r.x, r.y,
1.165 + r.x - dx, r.y - dy,
1.166 + r.width, r.height,
1.167 + False);
1.168 + }
1.169 +
1.170 + XFreeGC(dpy, gc);
1.171 +
1.172 + // FIXME/bug 597336: we need to ensure that the shm image isn't
1.173 + // scribbled over before all its pending XShmPutImage()s complete.
1.174 + // However, XSync() is an unnecessarily heavyweight
1.175 + // synchronization mechanism; other options are possible. If this
1.176 + // XSync is shown to hurt responsiveness, we need to explore the
1.177 + // other options.
1.178 + XSync(dpy, False);
1.179 +}
1.180 +
1.181 +#elif defined(MOZ_WIDGET_QT)
1.182 +void
1.183 +nsShmImage::Put(QWindow* aWindow, QRect& aRect)
1.184 +{
1.185 + Display* dpy = gfxQtPlatform::GetXDisplay(aWindow);
1.186 + Drawable d = aWindow->winId();
1.187 +
1.188 + GC gc = XCreateGC(dpy, d, 0, nullptr);
1.189 + // Avoid out of bounds painting
1.190 + QRect inter = aRect.intersected(aWindow->geometry());
1.191 + XShmPutImage(dpy, d, gc, mImage,
1.192 + inter.x(), inter.y(),
1.193 + inter.x(), inter.y(),
1.194 + inter.width(), inter.height(),
1.195 + False);
1.196 + XFreeGC(dpy, gc);
1.197 +}
1.198 +#endif
1.199 +
1.200 +already_AddRefed<gfxASurface>
1.201 +nsShmImage::EnsureShmImage(const gfxIntSize& aSize, Visual* aVisual, unsigned int aDepth,
1.202 + nsRefPtr<nsShmImage>& aImage)
1.203 +{
1.204 + if (!aImage || aImage->Size() != aSize) {
1.205 + // Because we XSync() after XShmAttach() to trap errors, we
1.206 + // know that the X server has the old image's memory mapped
1.207 + // into its address space, so it's OK to destroy the old image
1.208 + // here even if there are outstanding Puts. The Detach is
1.209 + // ordered after the Puts.
1.210 + aImage = nsShmImage::Create(aSize, aVisual, aDepth);
1.211 + }
1.212 + return !aImage ? nullptr : aImage->AsSurface();
1.213 +}
1.214 +
1.215 +#endif // defined(MOZ_X11) && defined(MOZ_HAVE_SHAREDMEMORYSYSV)
