michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  *
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #if defined(MOZ_WIDGET_GTK)
michael@0: #include <gtk/gtk.h>
michael@0: #include <gdk/gdkx.h>
michael@0: #elif defined(MOZ_WIDGET_QT)
michael@0: #include <QWindow>
michael@0: #endif
michael@0: 
michael@0: #include "nsShmImage.h"
michael@0: #include "gfxPlatform.h"
michael@0: #include "gfxImageSurface.h"
michael@0: 
michael@0: #ifdef MOZ_HAVE_SHMIMAGE
michael@0: 
michael@0: using namespace mozilla::ipc;
michael@0: 
michael@0: // If XShm isn't available to our client, we'll try XShm once, fail,
michael@0: // set this to false and then never try again.
michael@0: static bool gShmAvailable = true;
michael@0: bool nsShmImage::UseShm()
michael@0: {
michael@0:     return gfxPlatform::GetPlatform()->
michael@0:         ScreenReferenceSurface()->GetType() == gfxSurfaceType::Image
michael@0:         && gShmAvailable;
michael@0: }
michael@0: 
michael@0: already_AddRefed<nsShmImage>
michael@0: nsShmImage::Create(const gfxIntSize& aSize,
michael@0:                    Visual* aVisual, unsigned int aDepth)
michael@0: {
michael@0:     Display* dpy = DISPLAY();
michael@0: 
michael@0:     nsRefPtr<nsShmImage> shm = new nsShmImage();
michael@0:     shm->mImage = XShmCreateImage(dpy, aVisual, aDepth,
michael@0:                                   ZPixmap, nullptr,
michael@0:                                   &(shm->mInfo),
michael@0:                                   aSize.width, aSize.height);
michael@0:     if (!shm->mImage) {
michael@0:         return nullptr;
michael@0:     }
michael@0: 
michael@0:     size_t size = SharedMemory::PageAlignedSize(
michael@0:         shm->mImage->bytes_per_line * shm->mImage->height);
michael@0:     shm->mSegment = new SharedMemorySysV();
michael@0:     if (!shm->mSegment->Create(size) || !shm->mSegment->Map(size)) {
michael@0:         return nullptr;
michael@0:     }
michael@0: 
michael@0:     shm->mInfo.shmid = shm->mSegment->GetHandle();
michael@0:     shm->mInfo.shmaddr =
michael@0:         shm->mImage->data = static_cast<char*>(shm->mSegment->memory());
michael@0:     shm->mInfo.readOnly = False;
michael@0: 
michael@0:     int xerror = 0;
michael@0: #if defined(MOZ_WIDGET_GTK)
michael@0:     gdk_error_trap_push();
michael@0:     Status attachOk = XShmAttach(dpy, &shm->mInfo);
michael@0:     XSync(dpy, False);
michael@0:     xerror = gdk_error_trap_pop();
michael@0: #elif defined(MOZ_WIDGET_QT)
michael@0:     Status attachOk = XShmAttach(dpy, &shm->mInfo);
michael@0: #endif
michael@0: 
michael@0:     if (!attachOk || xerror) {
michael@0:         // Assume XShm isn't available, and don't attempt to use it
michael@0:         // again.
michael@0:         gShmAvailable = false;
michael@0:         return nullptr;
michael@0:     }
michael@0: 
michael@0:     shm->mXAttached = true;
michael@0:     shm->mSize = aSize;
michael@0:     switch (shm->mImage->depth) {
michael@0:     case 32:
michael@0:         if ((shm->mImage->red_mask == 0xff0000) &&
michael@0:             (shm->mImage->green_mask == 0xff00) &&
michael@0:             (shm->mImage->blue_mask == 0xff)) {
michael@0:             shm->mFormat = gfxImageFormat::ARGB32;
michael@0:             break;
michael@0:         }
michael@0:         goto unsupported;
michael@0:     case 24:
michael@0:         // Only xRGB is supported.
michael@0:         if ((shm->mImage->red_mask == 0xff0000) &&
michael@0:             (shm->mImage->green_mask == 0xff00) &&
michael@0:             (shm->mImage->blue_mask == 0xff)) {
michael@0:             shm->mFormat = gfxImageFormat::RGB24;
michael@0:             break;
michael@0:         }
michael@0:         goto unsupported;
michael@0:     case 16:
michael@0:         shm->mFormat = gfxImageFormat::RGB16_565; break;
michael@0:     unsupported:
michael@0:     default:
michael@0:         NS_WARNING("Unsupported XShm Image format!");
michael@0:         gShmAvailable = false;
michael@0:         return nullptr;
michael@0:     }
michael@0:     return shm.forget();
michael@0: }
michael@0: 
michael@0: already_AddRefed<gfxASurface>
michael@0: nsShmImage::AsSurface()
michael@0: {
michael@0:     return nsRefPtr<gfxASurface>(
michael@0:         new gfxImageSurface(static_cast<unsigned char*>(mSegment->memory()),
michael@0:                             mSize,
michael@0:                             mImage->bytes_per_line,
michael@0:                             mFormat)
michael@0:         ).forget();
michael@0: }
michael@0: 
michael@0: #if (MOZ_WIDGET_GTK == 2)
michael@0: void
michael@0: nsShmImage::Put(GdkWindow* aWindow, GdkRectangle* aRects, GdkRectangle* aEnd)
michael@0: {
michael@0:     GdkDrawable* gd;
michael@0:     gint dx, dy;
michael@0:     gdk_window_get_internal_paint_info(aWindow, &gd, &dx, &dy);
michael@0: 
michael@0:     Display* dpy = gdk_x11_get_default_xdisplay();
michael@0:     Drawable d = GDK_DRAWABLE_XID(gd);
michael@0: 
michael@0:     GC gc = XCreateGC(dpy, d, 0, nullptr);
michael@0:     for (GdkRectangle* r = aRects; r < aEnd; r++) {
michael@0:         XShmPutImage(dpy, d, gc, mImage,
michael@0:                      r->x, r->y,
michael@0:                      r->x - dx, r->y - dy,
michael@0:                      r->width, r->height,
michael@0:                      False);
michael@0:     }
michael@0:     XFreeGC(dpy, gc);
michael@0: 
michael@0:     // FIXME/bug 597336: we need to ensure that the shm image isn't
michael@0:     // scribbled over before all its pending XShmPutImage()s complete.
michael@0:     // However, XSync() is an unnecessarily heavyweight
michael@0:     // synchronization mechanism; other options are possible.  If this
michael@0:     // XSync is shown to hurt responsiveness, we need to explore the
michael@0:     // other options.
michael@0:     XSync(dpy, False);
michael@0: }
michael@0: 
michael@0: #elif (MOZ_WIDGET_GTK == 3)
michael@0: void
michael@0: nsShmImage::Put(GdkWindow* aWindow, cairo_rectangle_list_t* aRects)
michael@0: {
michael@0:     Display* dpy = gdk_x11_get_default_xdisplay();
michael@0:     Drawable d = GDK_WINDOW_XID(aWindow);
michael@0:     int dx = 0, dy = 0;
michael@0: 
michael@0:     GC gc = XCreateGC(dpy, d, 0, nullptr);
michael@0:     cairo_rectangle_t r;
michael@0:     for (int i = 0; i < aRects->num_rectangles; i++) {
michael@0:         r = aRects->rectangles[i];
michael@0:         XShmPutImage(dpy, d, gc, mImage,
michael@0:                      r.x, r.y,
michael@0:                      r.x - dx, r.y - dy,
michael@0:                      r.width, r.height,
michael@0:                      False);
michael@0:     }
michael@0: 
michael@0:     XFreeGC(dpy, gc);
michael@0: 
michael@0:     // FIXME/bug 597336: we need to ensure that the shm image isn't
michael@0:     // scribbled over before all its pending XShmPutImage()s complete.
michael@0:     // However, XSync() is an unnecessarily heavyweight
michael@0:     // synchronization mechanism; other options are possible.  If this
michael@0:     // XSync is shown to hurt responsiveness, we need to explore the
michael@0:     // other options.
michael@0:     XSync(dpy, False);
michael@0: }
michael@0: 
michael@0: #elif defined(MOZ_WIDGET_QT)
michael@0: void
michael@0: nsShmImage::Put(QWindow* aWindow, QRect& aRect)
michael@0: {
michael@0:     Display* dpy = gfxQtPlatform::GetXDisplay(aWindow);
michael@0:     Drawable d = aWindow->winId();
michael@0: 
michael@0:     GC gc = XCreateGC(dpy, d, 0, nullptr);
michael@0:     // Avoid out of bounds painting
michael@0:     QRect inter = aRect.intersected(aWindow->geometry());
michael@0:     XShmPutImage(dpy, d, gc, mImage,
michael@0:                  inter.x(), inter.y(),
michael@0:                  inter.x(), inter.y(),
michael@0:                  inter.width(), inter.height(),
michael@0:                  False);
michael@0:     XFreeGC(dpy, gc);
michael@0: }
michael@0: #endif
michael@0: 
michael@0: already_AddRefed<gfxASurface>
michael@0: nsShmImage::EnsureShmImage(const gfxIntSize& aSize, Visual* aVisual, unsigned int aDepth,
michael@0:                nsRefPtr<nsShmImage>& aImage)
michael@0: {
michael@0:     if (!aImage || aImage->Size() != aSize) {
michael@0:         // Because we XSync() after XShmAttach() to trap errors, we
michael@0:         // know that the X server has the old image's memory mapped
michael@0:         // into its address space, so it's OK to destroy the old image
michael@0:         // here even if there are outstanding Puts.  The Detach is
michael@0:         // ordered after the Puts.
michael@0:         aImage = nsShmImage::Create(aSize, aVisual, aDepth);
michael@0:     }
michael@0:     return !aImage ? nullptr : aImage->AsSurface();
michael@0: }
michael@0: 
michael@0: #endif  // defined(MOZ_X11) && defined(MOZ_HAVE_SHAREDMEMORYSYSV)