bool CCVideoLayerImpl::allocatePlaneData(CCRenderer* layerRenderer) { int maxTextureSize = layerRenderer->capabilities().maxTextureSize; for (unsigned planeIndex = 0; planeIndex < m_frame->planes(); ++planeIndex) { CCVideoLayerImpl::FramePlane& plane = m_framePlanes[planeIndex]; IntSize requiredTextureSize(m_frame->stride(planeIndex), videoFrameDimension(m_frame->height(), planeIndex, m_frame->format())); // FIXME: Remove the test against maxTextureSize when tiled layers are implemented. if (requiredTextureSize.isZero() || requiredTextureSize.width() > maxTextureSize || requiredTextureSize.height() > maxTextureSize) return false; if (plane.size != requiredTextureSize || plane.format != m_format) { plane.freeData(layerRenderer); plane.size = requiredTextureSize; plane.format = m_format; } if (!plane.textureId) { if (!plane.allocateData(layerRenderer)) return false; plane.visibleSize = computeVisibleSize(*m_frame, planeIndex); } } return true; }
bool CCVideoLayerImpl::reserveTextures(const WebKit::WebVideoFrame& frame, GC3Denum format, LayerRendererChromium* layerRenderer) { if (frame.planes() > MaxPlanes) return false; int maxTextureSize = layerRenderer->capabilities().maxTextureSize; for (unsigned plane = 0; plane < frame.planes(); ++plane) { IntSize requiredTextureSize(frame.stride(plane), videoFrameDimension(frame.height(), plane, frame.format())); // If the renderer cannot handle this large of a texture, return false. // FIXME: Remove this test when tiled layers are implemented. if (requiredTextureSize.isZero() || requiredTextureSize.width() > maxTextureSize || requiredTextureSize.height() > maxTextureSize) return false; if (!m_textures[plane].m_texture) { m_textures[plane].m_texture = ManagedTexture::create(layerRenderer->renderSurfaceTextureManager()); if (!m_textures[plane].m_texture) return false; m_textures[plane].m_visibleSize = IntSize(); } else { // The renderSurfaceTextureManager may have been destroyed and recreated since the last frame, so pass the new one. // This is a no-op if the TextureManager is still around. m_textures[plane].m_texture->setTextureManager(layerRenderer->renderSurfaceTextureManager()); } if (m_textures[plane].m_texture->size() != requiredTextureSize) m_textures[plane].m_visibleSize = computeVisibleSize(frame, plane); if (!m_textures[plane].m_texture->reserve(requiredTextureSize, format)) return false; } return true; }
IntSize CCVideoLayerImpl::computeVisibleSize(const WebKit::WebVideoFrame& frame, unsigned plane) { int visibleWidth = videoFrameDimension(frame.width(), plane, frame.format()); int originalWidth = visibleWidth; int visibleHeight = videoFrameDimension(frame.height(), plane, frame.format()); // When there are dead pixels at the edge of the texture, decrease // the frame width by 1 to prevent the rightmost pixels from // interpolating with the dead pixels. if (hasPaddingBytes(frame, plane)) --visibleWidth; // In YV12, every 2x2 square of Y values corresponds to one U and // one V value. If we decrease the width of the UV plane, we must decrease the // width of the Y texture by 2 for proper alignment. This must happen // always, even if Y's texture does not have padding bytes. if (plane == WebKit::WebVideoFrame::yPlane && frame.format() == WebKit::WebVideoFrame::FormatYV12) { if (hasPaddingBytes(frame, WebKit::WebVideoFrame::uPlane)) visibleWidth = originalWidth - 2; } return IntSize(visibleWidth, visibleHeight); }
static bool hasPaddingBytes(const WebKit::WebVideoFrame& frame, unsigned plane) { return frame.stride(plane) > videoFrameDimension(frame.width(), plane, frame.format()); }