/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- * ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is Novell code. * * The Initial Developer of the Original Code is Novell. * Portions created by the Initial Developer are Copyright (C) 2006 * the Initial Developer. All Rights Reserved. * * Contributor(s): * rocallahan@novell.com * * Alternatively, the contents of this file may be used under the terms of * either the GNU General Public License Version 2 or later (the "GPL"), or * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #include "gfxXlibNativeRenderer.h" #include "gfxContext.h" #include "cairo-xlib-utils.h" #ifdef MOZ_WIDGET_GTK2 #include #include #endif // Look for an existing Colormap that known to be associated with visual. static Colormap LookupColormapForVisual(const Screen* screen, const Visual* visual) { // common case if (visual == DefaultVisualOfScreen(screen)) return DefaultColormapOfScreen(screen); #ifdef MOZ_WIDGET_GTK2 // I wish there were a gdk_x11_display_lookup_screen. Display* dpy = DisplayOfScreen(screen); GdkDisplay* gdkDpy = gdk_x11_lookup_xdisplay(dpy); if (gdkDpy) { gint screen_num = 0; for (int s = 0; s < ScreenCount(dpy); ++s) { if (ScreenOfDisplay(dpy, s) == screen) { screen_num = s; break; } } GdkScreen* gdkScreen = gdk_display_get_screen(gdkDpy, screen_num); GdkColormap* gdkColormap = NULL; if (visual == GDK_VISUAL_XVISUAL(gdk_screen_get_rgb_visual(gdkScreen))) { // widget/src/gtk2/mozcontainer.c uses gdk_rgb_get_colormap() // which is inherited by child widgets, so this is the visual // expected when drawing directly to widget surfaces or surfaces // created using cairo_surface_create_similar with // CAIRO_CONTENT_COLOR. // gdk_screen_get_rgb_colormap is the generalization of // gdk_rgb_get_colormap for any screen. gdkColormap = gdk_screen_get_rgb_colormap(gdkScreen); } else if (visual == GDK_VISUAL_XVISUAL(gdk_screen_get_rgba_visual(gdkScreen))) { // This is the visual expected on displays with the Composite // extension enabled when the surface has been created using // cairo_surface_create_similar with CAIRO_CONTENT_COLOR_ALPHA, // as happens with non-unit opacity. gdkColormap = gdk_screen_get_rgba_colormap(gdkScreen); } if (gdkColormap != NULL) return GDK_COLORMAP_XCOLORMAP(gdkColormap); } #endif return None; } typedef struct { gfxXlibNativeRenderer* mRenderer; nsresult mRV; } NativeRenderingClosure; static cairo_bool_t NativeRendering(void *closure, Screen *screen, Drawable drawable, Visual *visual, short offset_x, short offset_y, XRectangle* rectangles, unsigned int num_rects) { // Cairo doesn't provide a Colormap. // See if a suitable existing Colormap is known. Colormap colormap = LookupColormapForVisual(screen, visual); PRBool allocColormap = colormap == None; if (allocColormap) { // No existing colormap found. // This case is not expected with MOZ_WIDGET_GTK2. // Create a Colormap for the Visual. // This is only really useful for Visual classes with predefined // Colormap entries, but cairo would be all confused with // non-default non-TrueColor colormaps anyway. NS_ASSERTION(visual->c_class == TrueColor || visual->c_class == StaticColor || visual->c_class == StaticGray, "Creating empty colormap"); // If this case were expected then it might be worth considering // using a service that maintains a set of Colormaps for associated // Visuals so as to avoid repeating the LockDisplay required in // XCreateColormap, but then it's no worse than the XCreatePixmap // that produced the Drawable here. colormap = XCreateColormap(DisplayOfScreen(screen), RootWindowOfScreen(screen), visual, AllocNone); } NativeRenderingClosure* cl = (NativeRenderingClosure*)closure; nsresult rv = cl->mRenderer-> NativeDraw(screen, drawable, visual, colormap, offset_x, offset_y, rectangles, num_rects); cl->mRV = rv; if (allocColormap) { XFreeColormap(DisplayOfScreen(screen), colormap); } return NS_SUCCEEDED(rv); } nsresult gfxXlibNativeRenderer::Draw(Display* dpy, gfxContext* ctx, int width, int height, PRUint32 flags, DrawOutput* output) { NativeRenderingClosure closure = { this, NS_OK }; cairo_xlib_drawing_result_t result; // Make sure result.surface is null to start with; we rely on it // being non-null meaning that a surface actually got allocated. result.surface = NULL; if (output) { output->mSurface = NULL; output->mUniformAlpha = PR_FALSE; output->mUniformColor = PR_FALSE; } int cairoFlags = 0; if (flags & DRAW_SUPPORTS_OFFSET) { cairoFlags |= CAIRO_XLIB_DRAWING_SUPPORTS_OFFSET; } if (flags & DRAW_SUPPORTS_CLIP_RECT) { cairoFlags |= CAIRO_XLIB_DRAWING_SUPPORTS_CLIP_RECT; } if (flags & DRAW_SUPPORTS_CLIP_LIST) { cairoFlags |= CAIRO_XLIB_DRAWING_SUPPORTS_CLIP_LIST; } if (flags & DRAW_SUPPORTS_ALTERNATE_SCREEN) { cairoFlags |= CAIRO_XLIB_DRAWING_SUPPORTS_ALTERNATE_SCREEN; } if (flags & DRAW_SUPPORTS_NONDEFAULT_VISUAL) { cairoFlags |= CAIRO_XLIB_DRAWING_SUPPORTS_NONDEFAULT_VISUAL; } cairo_draw_with_xlib(ctx->GetCairo(), NativeRendering, &closure, dpy, width, height, (flags & DRAW_IS_OPAQUE) ? CAIRO_XLIB_DRAWING_OPAQUE : CAIRO_XLIB_DRAWING_TRANSPARENT, (cairo_xlib_drawing_support_t)cairoFlags, output ? &result : NULL); if (NS_FAILED(closure.mRV)) { if (result.surface) { NS_ASSERTION(output, "How did that happen?"); cairo_surface_destroy (result.surface); } return closure.mRV; } if (output) { if (result.surface) { output->mSurface = gfxASurface::Wrap(result.surface); if (!output->mSurface) { cairo_surface_destroy (result.surface); return NS_ERROR_OUT_OF_MEMORY; } } output->mUniformAlpha = result.uniform_alpha; output->mUniformColor = result.uniform_color; output->mColor = gfxRGBA(result.r, result.g, result.b, result.alpha); } return NS_OK; }