PlatformCanvas.cpp [plain text]
#include "config.h"
#include "PlatformCanvas.h"
#include "GraphicsContext.h"
#if USE(SKIA)
#include "NativeImageSkia.h"
#include "PlatformContextSkia.h"
#include "SkColorPriv.h"
#include "skia/ext/platform_canvas.h"
#elif USE(CG)
#include <CoreGraphics/CGBitmapContext.h>
#endif
namespace WebCore {
PlatformCanvas::PlatformCanvas()
{
}
PlatformCanvas::~PlatformCanvas()
{
}
void PlatformCanvas::resize(const IntSize& size)
{
if (m_size == size)
return;
m_size = size;
#if USE(SKIA)
m_skiaCanvas = adoptPtr(skia::CreateBitmapCanvas(size.width(), size.height(), false));
#elif USE(CG)
size_t bufferSize = size.width() * size.height() * 4;
m_pixelData = adoptArrayPtr(new uint8_t[bufferSize]);
memset(m_pixelData.get(), 0, bufferSize);
#endif
}
PlatformCanvas::AutoLocker::AutoLocker(PlatformCanvas* canvas)
: m_canvas(canvas)
, m_pixels(0)
{
#if USE(SKIA)
if (m_canvas->m_skiaCanvas) {
m_bitmap = &m_canvas->m_skiaCanvas->getDevice()->accessBitmap(false);
m_bitmap->lockPixels();
if (m_bitmap->config() == SkBitmap::kARGB_8888_Config)
m_pixels = static_cast<uint8_t*>(m_bitmap->getPixels());
} else
m_bitmap = 0;
#elif USE(CG)
if (canvas->m_pixelData)
m_pixels = &canvas->m_pixelData[0];
#endif
}
PlatformCanvas::AutoLocker::~AutoLocker()
{
#if USE(SKIA)
if (m_bitmap)
m_bitmap->unlockPixels();
#endif
}
PlatformCanvas::Painter::Painter(PlatformCanvas* canvas, PlatformCanvas::Painter::TextOption option)
{
#if USE(SKIA)
m_skiaContext = adoptPtr(new PlatformContextSkia(canvas->m_skiaCanvas.get()));
m_skiaContext->setDrawingToImageBuffer(option == GrayscaleText);
m_context = adoptPtr(new GraphicsContext(reinterpret_cast<PlatformGraphicsContext*>(m_skiaContext.get())));
#elif USE(CG)
m_colorSpace = CGColorSpaceCreateDeviceRGB();
size_t rowBytes = canvas->size().width() * 4;
m_contextCG = CGBitmapContextCreate(canvas->m_pixelData.get(),
canvas->size().width(), canvas->size().height(), 8, rowBytes,
m_colorSpace.get(),
kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host);
CGContextTranslateCTM(m_contextCG.get(), 0, canvas->size().height());
CGContextScaleCTM(m_contextCG.get(), 1, -1);
m_context = adoptPtr(new GraphicsContext(m_contextCG.get()));
#endif
context()->save();
}
PlatformCanvas::Painter::~Painter()
{
context()->restore();
}
}