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