void GraphicsContext3D::readPixelsAndConvertToBGRAIfNecessary(int x, int y, int width, int height, unsigned char* pixels)
{
ASSERT(m_private);
bool readBGRA = !isGLES2Compliant() || platformGraphicsContext3D()->hasExtension("GL_EXT_read_format_bgra");
if (readBGRA)
m_functions->glReadPixels(x, y, width, height, GL_BGRA, GL_UNSIGNED_BYTE, pixels);
else
m_functions->glReadPixels(x, y, width, height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
int totalBytes = width * height * 4;
if (!readBGRA) {
for (int i = 0; i < totalBytes; i += 4)
std::swap(pixels[i], pixels[i + 2]); // Convert to BGRA.
}
}
void GraphicsContext3D::reshape(int width, int height)
{
if (!platformGraphicsContext3D())
return;
if (width == m_currentWidth && height == m_currentHeight)
return;
#if PLATFORM(QT) && USE(GRAPHICS_SURFACE)
::glFlush(); // Make sure all GL calls have been committed before resizing.
createGraphicsSurfaces(IntSize(width, height));
#endif
m_currentWidth = width;
m_currentHeight = height;
makeContextCurrent();
validateAttributes();
bool mustRestoreFBO = reshapeFBOs(IntSize(width, height));
// Initialize renderbuffers to 0.
GLfloat clearColor[] = {0, 0, 0, 0}, clearDepth = 0;
GLint clearStencil = 0;
GLboolean colorMask[] = {GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE}, depthMask = GL_TRUE;
GLuint stencilMask = 0xffffffff;
GLboolean isScissorEnabled = GL_FALSE;
GLboolean isDitherEnabled = GL_FALSE;
GLbitfield clearMask = GL_COLOR_BUFFER_BIT;
::glGetFloatv(GL_COLOR_CLEAR_VALUE, clearColor);
::glClearColor(0, 0, 0, 0);
::glGetBooleanv(GL_COLOR_WRITEMASK, colorMask);
::glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
if (m_attrs.depth) {
::glGetFloatv(GL_DEPTH_CLEAR_VALUE, &clearDepth);
GraphicsContext3D::clearDepth(1);
::glGetBooleanv(GL_DEPTH_WRITEMASK, &depthMask);
::glDepthMask(GL_TRUE);
clearMask |= GL_DEPTH_BUFFER_BIT;
}
if (m_attrs.stencil) {
::glGetIntegerv(GL_STENCIL_CLEAR_VALUE, &clearStencil);
::glClearStencil(0);
::glGetIntegerv(GL_STENCIL_WRITEMASK, reinterpret_cast<GLint*>(&stencilMask));
::glStencilMaskSeparate(GL_FRONT, 0xffffffff);
clearMask |= GL_STENCIL_BUFFER_BIT;
}
isScissorEnabled = ::glIsEnabled(GL_SCISSOR_TEST);
::glDisable(GL_SCISSOR_TEST);
isDitherEnabled = ::glIsEnabled(GL_DITHER);
::glDisable(GL_DITHER);
::glClear(clearMask);
::glClearColor(clearColor[0], clearColor[1], clearColor[2], clearColor[3]);
::glColorMask(colorMask[0], colorMask[1], colorMask[2], colorMask[3]);
if (m_attrs.depth) {
GraphicsContext3D::clearDepth(clearDepth);
::glDepthMask(depthMask);
}
if (m_attrs.stencil) {
::glClearStencil(clearStencil);
::glStencilMaskSeparate(GL_FRONT, stencilMask);
}
if (isScissorEnabled)
::glEnable(GL_SCISSOR_TEST);
else
::glDisable(GL_SCISSOR_TEST);
if (isDitherEnabled)
::glEnable(GL_DITHER);
else
::glDisable(GL_DITHER);
if (mustRestoreFBO)
::glBindFramebufferEXT(GraphicsContext3D::FRAMEBUFFER, m_boundFBO);
::glFlush();
}
