Unreviewed, rolling out r114929.
[WebKit-https.git] / Source / WebCore / platform / graphics / cairo / DrawingBufferCairo.cpp
1 /*
2  * Copyright (C) 2010 Apple Inc. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  * 1. Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
24  */
25
26 #include "config.h"
27
28 #if ENABLE(ACCELERATED_2D_CANVAS) || ENABLE(WEBGL)
29
30 #include "DrawingBuffer.h"
31
32 #include "Extensions3D.h"
33
34 namespace WebCore {
35
36 DrawingBuffer::DrawingBuffer(GraphicsContext3D* context,
37                              const IntSize& size,
38                              bool multisampleExtensionSupported,
39                              bool packedDepthStencilExtensionSupported,
40                              PreserveDrawingBuffer preserveDrawingBuffer,
41                              AlphaRequirement alpha)
42     : m_preserveDrawingBuffer(preserveDrawingBuffer)
43     , m_alpha(alpha)
44     , m_scissorEnabled(false)
45     , m_texture2DBinding(0)
46     , m_activeTextureUnit(GraphicsContext3D::TEXTURE0)
47     , m_context(context)
48     , m_size(-1, -1)
49     , m_multisampleExtensionSupported(multisampleExtensionSupported)
50     , m_packedDepthStencilExtensionSupported(packedDepthStencilExtensionSupported)
51     , m_fbo(context->createFramebuffer())
52     , m_colorBuffer(0)
53     , m_frontColorBuffer(0)
54     , m_separateFrontTexture(false)
55     , m_depthStencilBuffer(0)
56     , m_depthBuffer(0)
57     , m_stencilBuffer(0)
58     , m_multisampleFBO(0)
59     , m_multisampleColorBuffer(0)
60 {
61     ASSERT(m_fbo);
62     if (!m_fbo) {
63         clear();
64         return;
65     }
66         
67     // create a texture to render into
68     m_colorBuffer = context->createTexture();
69     context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_colorBuffer);
70     context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR);
71     context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR);
72     context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE);
73     context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE);
74     context->bindTexture(GraphicsContext3D::TEXTURE_2D, 0);
75     
76     createSecondaryBuffers();
77     reset(size);
78 }
79
80 DrawingBuffer::~DrawingBuffer()
81 {
82     clear();
83 }
84
85 #if USE(ACCELERATED_COMPOSITING)
86 void DrawingBuffer::prepareBackBuffer()
87 {
88 }
89
90 bool DrawingBuffer::requiresCopyFromBackToFrontBuffer() const
91 {
92     return false;
93 }
94
95 unsigned DrawingBuffer::frontColorBuffer() const
96 {
97     return colorBuffer();
98 }
99
100 void DrawingBuffer::paintCompositedResultsToCanvas(CanvasRenderingContext* context)
101 {
102 }
103 #endif
104
105 }
106
107 #endif