GraphicsContext3DCairo.cpp [plain text]
#include "config.h"
#include "GraphicsContext3D.h"
#if ENABLE(WEBGL)
#include "Extensions3DOpenGL.h"
#include "GraphicsContext3DPrivate.h"
#include "Image.h"
#include "OpenGLShims.h"
#include "PlatformContextCairo.h"
#include "RefPtrCairo.h"
#include "ShaderLang.h"
#include <cairo.h>
#include <wtf/NotFound.h>
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>
namespace WebCore {
PassRefPtr<GraphicsContext3D> GraphicsContext3D::create(GraphicsContext3D::Attributes attributes, HostWindow* hostWindow, GraphicsContext3D::RenderStyle renderStyle)
{
if (renderStyle == RenderDirectlyToHostWindow)
return 0;
static bool initialized = false;
static bool success = true;
if (!initialized) {
success = initializeOpenGLShims();
initialized = true;
}
if (!success)
return 0;
RefPtr<GraphicsContext3D> context = adoptRef(new GraphicsContext3D(attributes, hostWindow, false));
return context.release();
}
GraphicsContext3D::GraphicsContext3D(GraphicsContext3D::Attributes attributes, HostWindow* hostWindow, bool)
: m_currentWidth(0)
, m_currentHeight(0)
, m_attrs(attributes)
, m_texture(0)
, m_fbo(0)
, m_depthStencilBuffer(0)
, m_boundFBO(0)
, m_multisampleFBO(0)
, m_multisampleDepthStencilBuffer(0)
, m_multisampleColorBuffer(0)
, m_private(GraphicsContext3DPrivate::create(this, hostWindow))
{
makeContextCurrent();
validateAttributes();
::glGenTextures(1, &m_texture);
::glBindTexture(GL_TEXTURE_2D, m_texture);
::glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
::glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
::glBindTexture(GL_TEXTURE_2D, 0);
::glGenFramebuffersEXT(1, &m_fbo);
::glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_fbo);
m_boundFBO = m_fbo;
if (!m_attrs.antialias && (m_attrs.stencil || m_attrs.depth))
::glGenRenderbuffersEXT(1, &m_depthStencilBuffer);
if (m_attrs.antialias) {
::glGenFramebuffersEXT(1, &m_multisampleFBO);
::glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_multisampleFBO);
m_boundFBO = m_multisampleFBO;
::glGenRenderbuffersEXT(1, &m_multisampleColorBuffer);
if (m_attrs.stencil || m_attrs.depth)
::glGenRenderbuffersEXT(1, &m_multisampleDepthStencilBuffer);
}
ShBuiltInResources ANGLEResources;
ShInitBuiltInResources(&ANGLEResources);
getIntegerv(GraphicsContext3D::MAX_VERTEX_ATTRIBS, &ANGLEResources.MaxVertexAttribs);
getIntegerv(GraphicsContext3D::MAX_VERTEX_UNIFORM_VECTORS, &ANGLEResources.MaxVertexUniformVectors);
getIntegerv(GraphicsContext3D::MAX_VARYING_VECTORS, &ANGLEResources.MaxVaryingVectors);
getIntegerv(GraphicsContext3D::MAX_VERTEX_TEXTURE_IMAGE_UNITS, &ANGLEResources.MaxVertexTextureImageUnits);
getIntegerv(GraphicsContext3D::MAX_COMBINED_TEXTURE_IMAGE_UNITS, &ANGLEResources.MaxCombinedTextureImageUnits);
getIntegerv(GraphicsContext3D::MAX_TEXTURE_IMAGE_UNITS, &ANGLEResources.MaxTextureImageUnits);
getIntegerv(GraphicsContext3D::MAX_FRAGMENT_UNIFORM_VECTORS, &ANGLEResources.MaxFragmentUniformVectors);
ANGLEResources.MaxDrawBuffers = 1;
m_compiler.setResources(ANGLEResources);
::glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);
::glEnable(GL_POINT_SPRITE);
::glClearColor(0, 0, 0, 0);
}
GraphicsContext3D::~GraphicsContext3D()
{
makeContextCurrent();
::glDeleteTextures(1, &m_texture);
if (m_attrs.antialias) {
::glDeleteRenderbuffersEXT(1, &m_multisampleColorBuffer);
if (m_attrs.stencil || m_attrs.depth)
::glDeleteRenderbuffersEXT(1, &m_multisampleDepthStencilBuffer);
::glDeleteFramebuffersEXT(1, &m_multisampleFBO);
} else {
if (m_attrs.stencil || m_attrs.depth)
::glDeleteRenderbuffersEXT(1, &m_depthStencilBuffer);
}
::glDeleteFramebuffersEXT(1, &m_fbo);
}
bool GraphicsContext3D::getImageData(Image* image, unsigned int format, unsigned int type, bool premultiplyAlpha, bool ignoreGammaAndColorProfile, Vector<uint8_t>& outputVector)
{
if (!image)
return false;
ImageSource decoder(premultiplyAlpha ? ImageSource::AlphaPremultiplied : ImageSource::AlphaNotPremultiplied,
ignoreGammaAndColorProfile ? ImageSource::GammaAndColorProfileIgnored : ImageSource::GammaAndColorProfileApplied);
AlphaOp alphaOp = AlphaDoNothing;
RefPtr<cairo_surface_t> imageSurface;
if (image->data()) {
decoder.setData(image->data(), true);
if (!decoder.frameCount() || !decoder.frameIsCompleteAtIndex(0))
return false;
imageSurface = decoder.createFrameAtIndex(0)->surface();
} else {
imageSurface = image->nativeImageForCurrentFrame()->surface();
if (!premultiplyAlpha)
alphaOp = AlphaDoUnmultiply;
}
if (!imageSurface)
return false;
int width = cairo_image_surface_get_width(imageSurface.get());
int height = cairo_image_surface_get_height(imageSurface.get());
if (!width || !height)
return false;
if (cairo_image_surface_get_format(imageSurface.get()) != CAIRO_FORMAT_ARGB32)
return false;
unsigned int srcUnpackAlignment = 1;
size_t bytesPerRow = cairo_image_surface_get_stride(imageSurface.get());
size_t bitsPerPixel = 32;
unsigned int padding = bytesPerRow - bitsPerPixel / 8 * width;
if (padding) {
srcUnpackAlignment = padding + 1;
while (bytesPerRow % srcUnpackAlignment)
++srcUnpackAlignment;
}
outputVector.resize(width * height * 4);
return packPixels(cairo_image_surface_get_data(imageSurface.get()), SourceFormatBGRA8,
width, height, srcUnpackAlignment, format, type, alphaOp, outputVector.data());
}
void GraphicsContext3D::paintToCanvas(const unsigned char* imagePixels, int imageWidth, int imageHeight, int canvasWidth, int canvasHeight, PlatformContextCairo* context)
{
if (!imagePixels || imageWidth <= 0 || imageHeight <= 0 || canvasWidth <= 0 || canvasHeight <= 0 || !context)
return;
cairo_t *cr = context->cr();
context->save();
cairo_rectangle(cr, 0, 0, canvasWidth, canvasHeight);
cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
cairo_paint(cr);
RefPtr<cairo_surface_t> imageSurface = adoptRef(cairo_image_surface_create_for_data(
const_cast<unsigned char*>(imagePixels), CAIRO_FORMAT_ARGB32, imageWidth, imageHeight, imageWidth * 4));
cairo_translate(cr, 0, imageHeight);
cairo_scale(cr, 1, -1);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
cairo_set_source_surface(cr, imageSurface.get(), 0, 0);
cairo_rectangle(cr, 0, 0, canvasWidth, -canvasHeight);
cairo_fill(cr);
context->restore();
}
void GraphicsContext3D::setContextLostCallback(PassOwnPtr<ContextLostCallback>)
{
}
void GraphicsContext3D::setErrorMessageCallback(PassOwnPtr<ErrorMessageCallback>)
{
}
bool GraphicsContext3D::makeContextCurrent()
{
if (!m_private)
return false;
return m_private->makeContextCurrent();
}
PlatformGraphicsContext3D GraphicsContext3D::platformGraphicsContext3D()
{
return m_private->platformContext();
}
bool GraphicsContext3D::isGLES2Compliant() const
{
return false;
}
#if USE(ACCELERATED_COMPOSITING)
PlatformLayer* GraphicsContext3D::platformLayer() const
{
return m_private.get();
}
#endif
}
#endif // ENABLE(WEBGL)