本文整理匯總了C++中CGBitmapContextCreate函數的典型用法代碼示例。如果您正苦於以下問題：C++ CGBitmapContextCreate函數的具體用法？C++ CGBitmapContextCreate怎麽用？C++ CGBitmapContextCreate使用的例子？那麽, 這裏精選的函數代碼示例或許可以為您提供幫助。
在下文中一共展示了CGBitmapContextCreate函數的15個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的C++代碼示例。
示例1: resolveColorSpace
static void resolveColorSpace(const SkBitmap& bitmap, CGColorSpaceRef colorSpace)
{
int width = bitmap.width();
int height = bitmap.height();
CGImageRef srcImage = SkCreateCGImageRefWithColorspace(bitmap, colorSpace);
SkAutoLockPixels lock(bitmap);
void* pixels = bitmap.getPixels();
RetainPtr<CGContextRef> cgBitmap(AdoptCF, CGBitmapContextCreate(pixels, width, height, 8, width * 4, deviceRGBColorSpaceRef(), kCGBitmapByteOrder32Host | kCGImageAlphaPremultipliedFirst));
if (!cgBitmap)
return;
CGContextSetBlendMode(cgBitmap.get(), kCGBlendModeCopy);
CGRect bounds = { {0, 0}, {width, height} };
CGContextDrawImage(cgBitmap.get(), bounds, srcImage);
}示例2: SkPDFDocumentToBitmap
bool SkPDFDocumentToBitmap(SkStream* stream, SkBitmap* output) {
size_t size = stream->getLength();
void* ptr = sk_malloc_throw(size);
stream->read(ptr, size);
CGDataProviderRef data = CGDataProviderCreateWithData(NULL, ptr, size,
CGDataProviderReleaseData_FromMalloc);
if (NULL == data) {
return false;
}
CGPDFDocumentRef pdf = CGPDFDocumentCreateWithProvider(data);
CGDataProviderRelease(data);
if (NULL == pdf) {
return false;
}
SkAutoPDFRelease releaseMe(pdf);
CGPDFPageRef page = CGPDFDocumentGetPage(pdf, 1);
if (NULL == page) {
return false;
}
CGRect bounds = CGPDFPageGetBoxRect(page, kCGPDFMediaBox);
int w = (int)CGRectGetWidth(bounds);
int h = (int)CGRectGetHeight(bounds);
SkBitmap bitmap;
bitmap.setConfig(SkBitmap::kARGB_8888_Config, w, h);
bitmap.allocPixels();
bitmap.eraseColor(SK_ColorWHITE);
size_t bitsPerComponent;
CGBitmapInfo info;
getBitmapInfo(bitmap, &bitsPerComponent, &info, NULL);
CGColorSpaceRef cs = CGColorSpaceCreateDeviceRGB();
CGContextRef ctx = CGBitmapContextCreate(bitmap.getPixels(), w, h,
bitsPerComponent, bitmap.rowBytes(),
cs, info);
CGColorSpaceRelease(cs);
if (ctx) {
CGContextDrawPDFPage(ctx, page);
CGContextRelease(ctx);
}
output->swap(bitmap);
return true;
}示例3: IllegalArgumentException
void CGImageLuminanceSource::init (CGImageRef cgimage, int left, int top, int width, int height) {
data_ = 0;
image_ = cgimage;
left_ = left;
top_ = top;
width_ = width;
height_ = height;
dataWidth_ = (int)CGImageGetWidth(image_);
dataHeight_ = (int)CGImageGetHeight(image_);
if (left_ + width_ > dataWidth_ ||
top_ + height_ > dataHeight_ ||
top_ < 0 ||
left_ < 0) {
throw IllegalArgumentException("Crop rectangle does not fit within image data.");
}
CGColorSpaceRef space = CGImageGetColorSpace(image_);
CGColorSpaceModel model = CGColorSpaceGetModel(space);
if (model != kCGColorSpaceModelMonochrome || CGImageGetBitsPerComponent(image_) != 8 || CGImageGetBitsPerPixel(image_) != 8) {
CGColorSpaceRef gray = CGColorSpaceCreateDeviceGray();
CGContextRef ctx = CGBitmapContextCreate(0, width, height, 8, width, gray, kCGImageAlphaNone);
CGColorSpaceRelease(gray);
if (top || left) {
CGContextClipToRect(ctx, CGRectMake(0, 0, width, height));
}
CGContextDrawImage(ctx, CGRectMake(-left, -top, width, height), image_);
image_ = CGBitmapContextCreateImage(ctx);
bytesPerRow_ = width;
top_ = 0;
left_ = 0;
dataWidth_ = width;
dataHeight_ = height;
CGContextRelease(ctx);
} else {
CGImageRetain(image_);
}
CGDataProviderRef provider = CGImageGetDataProvider(image_);
data_ = CGDataProviderCopyData(provider);
}示例4: SetupContext
CGContextRef SetupContext()
{
//UIGraphicsBeginImageContext
int w = 480, h = 640;
//CGColorSpaceRef csICC = CGColorSpaceCreateWithIndex(15);
CGColorSpaceRef colourSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, CGBitmapGetAlignedBytesPerRow(w*4), colourSpace, kCGImageAlphaPremultipliedFirst);
CGColorSpaceRelease (colourSpace);
CGContextClear(context);
CGContextTranslateCTM(context, 0.0, 640.0);
CGContextScaleCTM(context, 1.0, -1.0);
return context;
}示例5: makeCG
static CGContextRef makeCG(const SkImageInfo& info, const void* addr,
size_t rowBytes) {
if (kPMColor_SkColorType != info.colorType() || NULL == addr) {
return NULL;
}
CGColorSpaceRef space = CGColorSpaceCreateDeviceRGB();
CGContextRef cg = CGBitmapContextCreate((void*)addr, info.width(), info.height(),
8, rowBytes, space, BITMAP_INFO_RGB);
CFRelease(space);
CGContextSetAllowsFontSubpixelQuantization(cg, false);
CGContextSetShouldSubpixelQuantizeFonts(cg, false);
return cg;
}示例6: SkPDFDocumentToBitmap
bool SkPDFDocumentToBitmap(SkStream* stream, SkBitmap* output) {
CGDataProviderRef data = SkCreateDataProviderFromStream(stream);
if (NULL == data) {
return false;
}
CGPDFDocumentRef pdf = CGPDFDocumentCreateWithProvider(data);
CGDataProviderRelease(data);
if (NULL == pdf) {
return false;
}
SkAutoPDFRelease releaseMe(pdf);
CGPDFPageRef page = CGPDFDocumentGetPage(pdf, 1);
if (NULL == page) {
return false;
}
CGRect bounds = CGPDFPageGetBoxRect(page, kCGPDFMediaBox);
int w = (int)CGRectGetWidth(bounds);
int h = (int)CGRectGetHeight(bounds);
SkBitmap bitmap;
if (!bitmap.tryAllocN32Pixels(w, h)) {
return false;
}
bitmap.eraseColor(SK_ColorWHITE);
size_t bitsPerComponent;
CGBitmapInfo info;
getBitmapInfo(bitmap, &bitsPerComponent, &info, NULL);
CGColorSpaceRef cs = CGColorSpaceCreateDeviceRGB();
CGContextRef ctx = CGBitmapContextCreate(bitmap.getPixels(), w, h,
bitsPerComponent, bitmap.rowBytes(),
cs, info);
CGColorSpaceRelease(cs);
if (ctx) {
CGContextDrawPDFPage(ctx, page);
CGContextRelease(ctx);
}
output->swap(bitmap);
return true;
}示例7: CreatePDFPageImage
CGImageRef CreatePDFPageImage(CGPDFPageRef page, CGFloat scale, bool transparentBackground)
{
CGSize pageSize = PDFPageGetSize(page, kCGPDFCropBox);
size_t width = scale * floorf(pageSize.width);
size_t height = scale * floorf(pageSize.height);
size_t bytesPerLine = width * 4;
uint64_t size = (uint64_t)height * (uint64_t)bytesPerLine;
if ((size == 0) || (size > SIZE_MAX))
return NULL;
void *bitmapData = malloc(size);
if (!bitmapData)
return NULL;
#if TARGET_OS_IPHONE
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
#else
CGColorSpaceRef colorSpace = CGColorSpaceCreateWithName(&kCGColorSpaceSRGB ? kCGColorSpaceSRGB : kCGColorSpaceGenericRGB);
#endif
CGContextRef context = CGBitmapContextCreate(bitmapData, width, height, 8, bytesPerLine, colorSpace, kCGImageAlphaPremultipliedFirst);
if (transparentBackground)
{
CGContextClearRect(context, CGRectMake(0, 0, width, height));
}
else
{
CGContextSetRGBFillColor(context, 1, 1, 1, 1); // white
CGContextFillRect(context, CGRectMake(0, 0, width, height));
}
// CGPDFPageGetDrawingTransform unfortunately does not upscale, see http://lists.apple.com/archives/quartz-dev/2005/Mar/msg00112.html
CGAffineTransform drawingTransform = PDFPageGetDrawingTransform(page, kCGPDFCropBox, scale);
CGContextConcatCTM(context, drawingTransform);
CGContextDrawPDFPage(context, page);
CGImageRef pdfImage = CGBitmapContextCreateImage(context);
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
free(bitmapData);
return pdfImage;
}示例8: createBitmapContextFromWebView
PassRefPtr<BitmapContext> createBitmapContextFromWebView(bool onscreen, bool incrementalRepaint, bool sweepHorizontally, bool drawSelectionRect)
{
RECT frame;
if (!GetWindowRect(webViewWindow, &frame))
return nullptr;
BITMAPINFO bmp = {0};
bmp.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmp.bmiHeader.biWidth = frame.right - frame.left;
bmp.bmiHeader.biHeight = -(frame.bottom - frame.top);
bmp.bmiHeader.biPlanes = 1;
bmp.bmiHeader.biBitCount = 32;
bmp.bmiHeader.biCompression = BI_RGB;
void* bits = 0;
HBITMAP bitmap = ::CreateDIBSection(0, &bmp, DIB_RGB_COLORS, &bits, 0, 0);
if (!bitmap)
return nullptr;
auto memoryDC = adoptGDIObject(::CreateCompatibleDC(0));
::SelectObject(memoryDC.get(), bitmap);
SendMessage(webViewWindow, WM_PRINT, reinterpret_cast<WPARAM>(memoryDC.get()), PRF_CLIENT | PRF_CHILDREN | PRF_OWNED);
BITMAP info = {0};
GetObject(bitmap, sizeof(info), &info);
ASSERT(info.bmBitsPixel == 32);
// We create a context that has an alpha channel below so that the PNGs we generate will also
// have an alpha channel. But WM_PRINT doesn't necessarily write anything into the alpha
// channel, so we set the alpha channel to constant full opacity to make sure the resulting image is opaque.
makeAlphaChannelOpaque(info.bmBits, info.bmWidth, info.bmHeight);
#if USE(CG)
RetainPtr<CGColorSpaceRef> colorSpace = adoptCF(CGColorSpaceCreateDeviceRGB());
CGContextRef context = CGBitmapContextCreate(info.bmBits, info.bmWidth, info.bmHeight, 8,
info.bmWidthBytes, colorSpace.get(), kCGBitmapByteOrder32Host | kCGImageAlphaPremultipliedFirst);
#elif USE(CAIRO)
cairo_surface_t* image = cairo_image_surface_create_for_data((unsigned char*)info.bmBits, CAIRO_FORMAT_ARGB32,
info.bmWidth, info.bmHeight, info.bmWidthBytes);
cairo_t* context = cairo_create(image);
cairo_surface_destroy(image);
#endif
return BitmapContext::createByAdoptingBitmapAndContext(bitmap, context);
}示例9: copyImageData_color
static void copyImageData_color( CGImageRef imageRef, cv::Mat &image )
{
size_t width = CGImageGetWidth(imageRef);
size_t height = CGImageGetHeight(imageRef);
image = cv::Mat( cv::Size( width, height ), CV_8UC3 );
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
unsigned char *rawData = image.data;
size_t bytesPerPixel = 4;
size_t bytesPerRow = bytesPerPixel * width;
size_t bitsPerComponent = 8;
CGContextRef context = CGBitmapContextCreate(rawData, width, height,
bitsPerComponent, bytesPerRow, colorSpace,
kCGImageAlphaPremultipliedLast | kCGBitmapByteOrderDefault);
CGColorSpaceRelease(colorSpace);
CGContextDrawImage(context, CGRectMake(0, 0, width, height), imageRef);
CGContextRelease(context);
}示例10: draw__new_bitmap
draw__Bitmap draw__new_bitmap(int w, int h) {
init_if_needed();
int bytes_per_row = w * 4;
draw__Bitmap bitmap = CGBitmapContextCreate(NULL, // data
w,
h,
8, // bits per component
bytes_per_row,
generic_rgb_colorspace,
(CGBitmapInfo)kCGImageAlphaPremultipliedLast);
// Make (0, 0) correspond to the lower-left corner.
CGContextTranslateCTM(bitmap, 0, h);
CGContextScaleCTM(bitmap, 1.0, -1.0);
return bitmap;
}示例11: MCTileCacheCoreGraphicsCompositor_AllocateTile
bool MCTileCacheCoreGraphicsCompositor_AllocateTile(void *p_context, int32_t p_size, const void *p_bits, uint32_t p_stride, void*& r_tile)
{
MCTileCacheCoreGraphicsCompositorContext *self;
self = (MCTileCacheCoreGraphicsCompositorContext *)p_context;
// If the stride is exactly one tile wide, we don't need a copy.
void *t_data;
t_data = nil;
if (p_stride == p_size * sizeof(uint32_t))
t_data = (void *)p_bits;
else if (MCMemoryAllocate(p_size * p_size * sizeof(uint32_t), t_data))
{
// Copy across each scanline of the tile into the buffer.
for(int32_t y = 0; y < p_size; y++)
memcpy((uint8_t *)t_data + y * p_size * sizeof(uint32_t), (uint8_t *)p_bits + p_stride * y, p_size * sizeof(uint32_t));
}
CGImageRef t_tile;
t_tile = nil;
if (t_data != nil)
{
// IM-2013-08-21: [[ RefactorGraphics ]] Refactor CGImage creation code to be pixel-format independent
CGBitmapInfo t_bm_info;
t_bm_info = MCGPixelFormatToCGBitmapInfo(kMCGPixelFormatNative, true);
CGContextRef t_cgcontext;
t_cgcontext = CGBitmapContextCreate((void *)t_data, p_size, p_size, 8, p_size * sizeof(uint32_t), self -> colorspace, t_bm_info);
if (t_cgcontext != nil)
{
t_tile = CGBitmapContextCreateImage(t_cgcontext);
CGContextRelease(t_cgcontext);
}
}
if (t_data != p_bits)
MCMemoryDeallocate(t_data);
if (t_tile == nil)
return false;
r_tile = t_tile;
return true;
}示例12: allocImage
GDIObject<HBITMAP> allocImage(HDC dc, IntSize size, CGContextRef *targetRef)
{
BitmapInfo bmpInfo = BitmapInfo::create(size);
LPVOID bits;
auto hbmp = adoptGDIObject(::CreateDIBSection(dc, &bmpInfo, DIB_RGB_COLORS, &bits, 0, 0));
if (!targetRef)
return hbmp;
CGContextRef bitmapContext = CGBitmapContextCreate(bits, bmpInfo.bmiHeader.biWidth, bmpInfo.bmiHeader.biHeight, 8,
bmpInfo.bmiHeader.biWidth * 4, deviceRGBColorSpaceRef(),
kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipFirst);
if (!bitmapContext)
return GDIObject<HBITMAP>();
*targetRef = bitmapContext;
return hbmp;
}示例13: CFDataGetMutableBytePtr
CGImageRef Image::createAbstraction(float stylization, uint quantization)
{
pixel4b *rgbPixels = (pixel4b *) CFDataGetMutableBytePtr(_data);
// Convert from RGB to Lab colorspace to perform operations on lightness channel.
RGBtoLab(rgbPixels, _pixels);
// Initial bilateral filter.
bilateral();
// Extract edges.
pixel3f *edges = createEdges(stylization);
// Additional bilateral filtering.
bilateral();
bilateral();
// Quantize lightness channel.
quantize(quantization);
// Overlay edges.
overlayEdges(edges);
// Convert back to RGB colorspace.
LabtoRGB(_pixels, rgbPixels);
// Create an image from the modified data.
CGContextRef context = CGBitmapContextCreate(
rgbPixels,
_width,
_height,
_bitsPerComponent,
_bytesPerRow,
_colorSpaceRef,
_bitmapInfo
);
CGImageRef image = CGBitmapContextCreateImage(context);
delete[] edges;
return image;
}示例14: ASSERT
String ImageBuffer::toDataURL(const String& mimeType, const double* quality, CoordinateSystem) const
{
ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
if (context().isAcceleratedContext())
flushContext();
RetainPtr<CFStringRef> uti = utiFromMIMEType(mimeType);
ASSERT(uti);
RefPtr<Uint8ClampedArray> premultipliedData;
RetainPtr<CGImageRef> image;
if (CFEqual(uti.get(), jpegUTI())) {
// JPEGs don't have an alpha channel, so we have to manually composite on top of black.
premultipliedData = getPremultipliedImageData(IntRect(IntPoint(0, 0), logicalSize()));
if (!premultipliedData)
return "data:,";
RetainPtr<CGDataProviderRef> dataProvider;
dataProvider = adoptCF(CGDataProviderCreateWithData(0, premultipliedData->data(), 4 * logicalSize().width() * logicalSize().height(), 0));
if (!dataProvider)
return "data:,";
image = adoptCF(CGImageCreate(logicalSize().width(), logicalSize().height(), 8, 32, 4 * logicalSize().width(),
deviceRGBColorSpaceRef(), kCGBitmapByteOrderDefault | kCGImageAlphaNoneSkipLast,
dataProvider.get(), 0, false, kCGRenderingIntentDefault));
} else if (m_resolutionScale == 1) {
image = copyNativeImage(CopyBackingStore);
image = createCroppedImageIfNecessary(image.get(), internalSize());
} else {
image = copyNativeImage(DontCopyBackingStore);
RetainPtr<CGContextRef> context = adoptCF(CGBitmapContextCreate(0, logicalSize().width(), logicalSize().height(), 8, 4 * logicalSize().width(), deviceRGBColorSpaceRef(), kCGImageAlphaPremultipliedLast));
CGContextSetBlendMode(context.get(), kCGBlendModeCopy);
CGContextClipToRect(context.get(), CGRectMake(0, 0, logicalSize().width(), logicalSize().height()));
FloatSize imageSizeInUserSpace = scaleSizeToUserSpace(logicalSize(), m_data.backingStoreSize, internalSize());
CGContextDrawImage(context.get(), CGRectMake(0, 0, imageSizeInUserSpace.width(), imageSizeInUserSpace.height()), image.get());
image = adoptCF(CGBitmapContextCreateImage(context.get()));
}
return CGImageToDataURL(image.get(), mimeType, quality);
}示例15: adoptCF
void BitmapImage::checkForSolidColor()
{
m_checkedForSolidColor = true;
m_isSolidColor = false;
if (frameCount() > 1)
return;
if (!haveFrameAtIndex(0)) {
IntSize size = m_source.frameSizeAtIndex(0, 0);
if (size.width() != 1 || size.height() != 1)
return;
if (!ensureFrameIsCached(0))
return;
}
CGImageRef image = nullptr;
if (m_frames.size())
image = m_frames[0].m_frame;
if (!image)
return;
// Currently we only check for solid color in the important special case of a 1x1 image.
if (CGImageGetWidth(image) == 1 && CGImageGetHeight(image) == 1) {
unsigned char pixel[4]; // RGBA
RetainPtr<CGContextRef> bitmapContext = adoptCF(CGBitmapContextCreate(pixel, 1, 1, 8, sizeof(pixel), deviceRGBColorSpaceRef(),
kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big));
if (!bitmapContext)
return;
GraphicsContext(bitmapContext.get()).setCompositeOperation(CompositeCopy);
CGRect destinationRect = CGRectMake(0, 0, 1, 1);
CGContextDrawImage(bitmapContext.get(), destinationRect, image);
if (!pixel[3])
m_solidColor = Color(0, 0, 0, 0);
else
m_solidColor = Color(pixel[0] * 255 / pixel[3], pixel[1] * 255 / pixel[3], pixel[2] * 255 / pixel[3], pixel[3]);
m_isSolidColor = true;
}
}