Source/WebCore/platform/graphics/gpu/qt/DrawingBufferQt.cpp

   1 /*
   2  * Copyright (C) 2011 Andrew Wason (rectalogic@rectalogic.com)
   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 namespace WebCore {
  33
  34 DrawingBuffer::DrawingBuffer(GraphicsContext3D* context,
  35                              const IntSize& size,
  36                              bool multisampleExtensionSupported,
  37                              bool packedDepthStencilExtensionSupported,
  38                              PreserveDrawingBuffer preserveDrawingBuffer,
  39                              AlphaRequirement alpha)
  40     : m_preserveDrawingBuffer(preserveDrawingBuffer)
  41     , m_alpha(alpha)
  42     , m_scissorEnabled(false)
  43     , m_texture2DBinding(0)
  44     , m_framebufferBinding(0)
  45     , m_activeTextureUnit(GraphicsContext3D::TEXTURE0)
  46     , m_context(context)
  47     , m_size(-1, -1)
  48     , m_multisampleExtensionSupported(multisampleExtensionSupported)
  49     , m_packedDepthStencilExtensionSupported(packedDepthStencilExtensionSupported)
  50     , m_fbo(context->createFramebuffer())
  51     , m_colorBuffer(0)
  52     , m_frontColorBuffer(0)
  53     , m_separateFrontTexture(false)
  54     , m_depthStencilBuffer(0)
  55     , m_depthBuffer(0)
  56     , m_stencilBuffer(0)
  57     , m_multisampleFBO(0)
  58     , m_multisampleColorBuffer(0)
  59 {
  60     ASSERT(m_fbo);
  61     if (!m_fbo) {
  62         clear();
  63         return;
  64     }
  65
  66     // create a texture to render into
  67     m_colorBuffer = context->createTexture();
  68     context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_colorBuffer);
  69     context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR);
  70     context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR);
  71     context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE);
  72     context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE);
  73     context->bindTexture(GraphicsContext3D::TEXTURE_2D, 0);
  74
  75     createSecondaryBuffers();
  76     reset(size);
  77 }
  78
  79 DrawingBuffer::~DrawingBuffer()
  80 {
  81     clear();
  82 }
  83
  84 #if USE(ACCELERATED_COMPOSITING)
  85 PlatformLayer* DrawingBuffer::platformLayer()
  86 {
  87     return 0;
  88 }
  89
  90 void DrawingBuffer::prepareBackBuffer()
  91 {
  92 }
  93
  94 bool DrawingBuffer::requiresCopyFromBackToFrontBuffer() const
  95 {
  96     return false;
  97 }
  98
  99 unsigned DrawingBuffer::frontColorBuffer() const
 100 {
 101     return colorBuffer();
 102 }
 103
 104 void DrawingBuffer::paintCompositedResultsToCanvas(CanvasRenderingContext* context)
 105 {
 106 }
 107 #endif
 108
 109 }
 110
 111 #endif