gfx/thebes/src/gfxGdkNativeRenderer.cpp

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
   2  * ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
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  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is Novell code.
  16  *
  17  * The Initial Developer of the Original Code is Novell.
  18  * Portions created by the Initial Developer are Copyright (C) 2006
  19  * the Initial Developer. All Rights Reserved.
  20  *
  21  * Contributor(s):
  22  *   rocallahan@novell.com
  23  *   Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
  24  *
  25  * Alternatively, the contents of this file may be used under the terms of
  26  * either the GNU General Public License Version 2 or later (the "GPL"), or
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  37  * ***** END LICENSE BLOCK ***** */
  38
  39 #include "gfxGdkNativeRenderer.h"
  40 #include "gfxContext.h"
  41
  42 #include "cairo-gdk-utils.h"
  43
  44 #include "gfxPlatformGtk.h"
  45
  46 typedef struct {
  47     gfxGdkNativeRenderer* mRenderer;
  48     nsresult               mRV;
  49 } NativeRenderingClosure;
  50
  51
  52 static cairo_bool_t
  53 NativeRendering(void *closure,
  54                 cairo_surface_t *surface,
  55                 short offset_x, short offset_y,
  56                 GdkRectangle * rectangles, unsigned int num_rects)
  57 {
  58     NativeRenderingClosure* cl = (NativeRenderingClosure*)closure;
  59     nsRefPtr<gfxASurface> gfxSurface = gfxASurface::Wrap(surface);
  60     GdkDrawable *drawable =
  61         gfxPlatformGtk::GetPlatform()->GetGdkDrawable(gfxSurface);
  62     if (!drawable)
  63         return 0;
  64
  65     nsresult rv = cl->mRenderer->
  66         NativeDraw(drawable, offset_x, offset_y,
  67                    rectangles, num_rects);
  68     cl->mRV = rv;
  69     return NS_SUCCEEDED(rv);
  70 }
  71
  72
  73 nsresult
  74 gfxGdkNativeRenderer::Draw(gfxContext* ctx, int width, int height,
  75                             PRUint32 flags, DrawOutput* output)
  76 {
  77     NativeRenderingClosure closure = { this, NS_OK };
  78     cairo_gdk_drawing_result_t result;
  79     // Make sure result.surface is null to start with; we rely on it
  80     // being non-null meaning that a surface actually got allocated.
  81     result.surface = NULL;
  82
  83     if (output) {
  84         output->mSurface = NULL;
  85         output->mUniformAlpha = PR_FALSE;
  86         output->mUniformColor = PR_FALSE;
  87     }
  88
  89     int cairoFlags = 0;
  90     if (flags & DRAW_SUPPORTS_OFFSET) {
  91         cairoFlags |= CAIRO_GDK_DRAWING_SUPPORTS_OFFSET;
  92     }
  93     if (flags & DRAW_SUPPORTS_CLIP_RECT) {
  94         cairoFlags |= CAIRO_GDK_DRAWING_SUPPORTS_CLIP_RECT;
  95     }
  96     if (flags & DRAW_SUPPORTS_CLIP_LIST) {
  97         cairoFlags |= CAIRO_GDK_DRAWING_SUPPORTS_CLIP_LIST;
  98     }
  99     if (flags & DRAW_SUPPORTS_ALTERNATE_SCREEN) {
 100         cairoFlags |= CAIRO_GDK_DRAWING_SUPPORTS_ALTERNATE_SCREEN;
 101     }
 102     if (flags & DRAW_SUPPORTS_NONDEFAULT_VISUAL) {
 103         cairoFlags |= CAIRO_GDK_DRAWING_SUPPORTS_NONDEFAULT_VISUAL;
 104     }
 105     cairo_draw_with_gdk(ctx->GetCairo(),
 106                         NativeRendering,
 107                         &closure, width, height,
 108                         (flags & DRAW_IS_OPAQUE) ? CAIRO_GDK_DRAWING_OPAQUE : CAIRO_GDK_DRAWING_TRANSPARENT,
 109                         (cairo_gdk_drawing_support_t)cairoFlags,
 110                         output ? &result : NULL);
 111     if (NS_FAILED(closure.mRV)) {
 112         if (result.surface) {
 113             NS_ASSERTION(output, "How did that happen?");
 114             cairo_surface_destroy (result.surface);
 115         }
 116         return closure.mRV;
 117     }
 118
 119     if (output) {
 120         if (result.surface) {
 121             output->mSurface = gfxASurface::Wrap(result.surface);
 122             if (!output->mSurface) {
 123                 cairo_surface_destroy (result.surface);
 124                 return NS_ERROR_OUT_OF_MEMORY;
 125             }
 126         }
 127
 128         output->mUniformAlpha = result.uniform_alpha;
 129         output->mUniformColor = result.uniform_color;
 130         output->mColor = gfxRGBA(result.r, result.g, result.b, result.alpha);
 131     }
 132
 133     return NS_OK;
 134 }