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      1 /*
      2  * Copyright (C) 2010 Google 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 
     33 #if USE(ACCELERATED_COMPOSITING)
     34 
     35 #include "Canvas2DLayerChromium.h"
     36 
     37 #include "DrawingBuffer.h"
     38 #include "GraphicsContext3D.h"
     39 #include "LayerRendererChromium.h"
     40 
     41 namespace WebCore {
     42 
     43 PassRefPtr<Canvas2DLayerChromium> Canvas2DLayerChromium::create(DrawingBuffer* drawingBuffer, GraphicsLayerChromium* owner)
     44 {
     45     return adoptRef(new Canvas2DLayerChromium(drawingBuffer, owner));
     46 }
     47 
     48 Canvas2DLayerChromium::Canvas2DLayerChromium(DrawingBuffer* drawingBuffer, GraphicsLayerChromium* owner)
     49     : CanvasLayerChromium(owner)
     50     , m_drawingBuffer(drawingBuffer)
     51 {
     52 }
     53 
     54 Canvas2DLayerChromium::~Canvas2DLayerChromium()
     55 {
     56     if (m_textureId)
     57         layerRendererContext()->deleteTexture(m_textureId);
     58     if (m_drawingBuffer && layerRenderer())
     59         layerRenderer()->removeChildContext(m_drawingBuffer->graphicsContext3D().get());
     60 }
     61 
     62 void Canvas2DLayerChromium::updateCompositorResources()
     63 {
     64     if (!m_contentsDirty || !m_drawingBuffer)
     65         return;
     66     if (m_textureChanged) { // We have to generate a new backing texture.
     67         GraphicsContext3D* context = layerRendererContext();
     68         if (m_textureId)
     69             context->deleteTexture(m_textureId);
     70         m_textureId = context->createTexture();
     71         context->activeTexture(GraphicsContext3D::TEXTURE0);
     72         context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_textureId);
     73         IntSize size = m_drawingBuffer->size();
     74         context->texImage2DResourceSafe(GraphicsContext3D::TEXTURE_2D, 0, GraphicsContext3D::RGBA, size.width(), size.height(), 0, GraphicsContext3D::RGBA, GraphicsContext3D::UNSIGNED_BYTE);
     75         // Set the min-mag filters to linear and wrap modes to GraphicsContext3D::CLAMP_TO_EDGE
     76         // to get around NPOT texture limitations of GLES.
     77         context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR);
     78         context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR);
     79         context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE);
     80         context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE);
     81         m_textureChanged = false;
     82         // FIXME: The finish() here is required because we have to make sure that the texture created in this
     83         // context (the compositor context) is actually created by the service side before the child context
     84         // attempts to use it (in publishToPlatformLayer).  finish() is currently the only call with strong
     85         // enough semantics to promise this, but is actually much stronger.  Ideally we'd do something like
     86         // inserting a fence here and waiting for it before trying to publish.
     87         context->finish();
     88     }
     89     // Update the contents of the texture used by the compositor.
     90     if (m_contentsDirty) {
     91         m_drawingBuffer->publishToPlatformLayer();
     92         m_contentsDirty = false;
     93     }
     94 }
     95 
     96 void Canvas2DLayerChromium::setTextureChanged()
     97 {
     98     m_textureChanged = true;
     99 }
    100 
    101 unsigned Canvas2DLayerChromium::textureId() const
    102 {
    103     return m_textureId;
    104 }
    105 
    106 void Canvas2DLayerChromium::setDrawingBuffer(DrawingBuffer* drawingBuffer)
    107 {
    108     if (drawingBuffer != m_drawingBuffer) {
    109         if (m_drawingBuffer && layerRenderer())
    110             layerRenderer()->removeChildContext(m_drawingBuffer->graphicsContext3D().get());
    111 
    112         m_drawingBuffer = drawingBuffer;
    113         m_textureChanged = true;
    114 
    115         if (drawingBuffer && layerRenderer())
    116             layerRenderer()->addChildContext(m_drawingBuffer->graphicsContext3D().get());
    117     }
    118 }
    119 
    120 void Canvas2DLayerChromium::setLayerRenderer(LayerRendererChromium* newLayerRenderer)
    121 {
    122     if (layerRenderer() != newLayerRenderer) {
    123         if (m_drawingBuffer->graphicsContext3D()) {
    124             if (layerRenderer())
    125                 layerRenderer()->removeChildContext(m_drawingBuffer->graphicsContext3D().get());
    126             if (newLayerRenderer)
    127                 newLayerRenderer->addChildContext(m_drawingBuffer->graphicsContext3D().get());
    128         }
    129 
    130         LayerChromium::setLayerRenderer(newLayerRenderer);
    131     }
    132 }
    133 
    134 }
    135 #endif // USE(ACCELERATED_COMPOSITING)
    136