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/* HBColorUtilities.m $
This file is part of the HandBrake source code.
Homepage: <http://handbrake.fr/>.
It may be used under the terms of the GNU General Public License. */
#import "HBImageUtilities.h"
#import <Cocoa/Cocoa.h>
#include "handbrake/handbrake.h"
CGImageRef CreateScaledCGImageFromCGImage(CGImageRef image, CGFloat thumbnailHeight)
{
// Create the bitmap context
CGContextRef context = NULL;
void * bitmapData;
int bitmapByteCount;
int bitmapBytesPerRow;
// Get image width, height. We'll use the entire image.
int width = (CGFloat)CGImageGetWidth(image) / (CGFloat)CGImageGetHeight(image) * thumbnailHeight;
int height = thumbnailHeight;
// Declare the number of bytes per row. Each pixel in the bitmap in this
// example is represented by 4 bytes; 8 bits each of red, green, blue, and
// alpha.
bitmapBytesPerRow = (width * 4);
bitmapByteCount = (bitmapBytesPerRow * height);
// Allocate memory for image data. This is the destination in memory
// where any drawing to the bitmap context will be rendered.
bitmapData = malloc(bitmapByteCount);
if (bitmapData == NULL)
{
return nil;
}
// Create the bitmap context. We want pre-multiplied ARGB, 8-bits
// per component. Regardless of what the source image format is
// (CMYK, Grayscale, and so on) it will be converted over to the format
// specified here by CGBitmapContextCreate.
CGColorSpaceRef colorspace = CGImageGetColorSpace(image);
context = CGBitmapContextCreate (bitmapData,width,height,8,bitmapBytesPerRow,
colorspace,kCGImageAlphaNoneSkipFirst);
if (context == NULL)
{
// error creating context
return nil;
}
// Draw the image to the bitmap context. Once we draw, the memory
// allocated for the context for rendering will then contain the
// raw image data in the specified color space.
CGContextDrawImage(context, CGRectMake(0,0,width, height), image);
CGImageRef imgRef = CGBitmapContextCreateImage(context);
CGContextRelease(context);
free(bitmapData);
return imgRef;
}
CGImageRef CGImageRotated(CGImageRef imgRef, CGFloat angle, BOOL flipped) CF_RETURNS_RETAINED
{
CGFloat angleInRadians = angle * (M_PI / 180);
CGFloat width = CGImageGetWidth(imgRef);
CGFloat height = CGImageGetHeight(imgRef);
CGRect imgRect = CGRectMake(0, 0, width, height);
CGAffineTransform transform = CGAffineTransformMakeRotation(angleInRadians);
CGRect rotatedRect = CGRectApplyAffineTransform(imgRect, transform);
CGColorSpaceRef colorSpace = CGImageGetColorSpace(imgRef);
CGContextRef bmContext = CGBitmapContextCreate(NULL,
(size_t)rotatedRect.size.width,
(size_t)rotatedRect.size.height,
8,
0,
colorSpace,
kCGImageAlphaPremultipliedFirst);
CGContextSetAllowsAntialiasing(bmContext, FALSE);
CGContextSetInterpolationQuality(bmContext, kCGInterpolationNone);
// Rotate
CGContextTranslateCTM(bmContext,
+ (rotatedRect.size.width / 2),
+ (rotatedRect.size.height / 2));
CGContextRotateCTM(bmContext, -angleInRadians);
CGContextTranslateCTM(bmContext,
- (rotatedRect.size.width / 2),
- (rotatedRect.size.height / 2));
// Flip
if (flipped)
{
CGAffineTransform flipHorizontal = CGAffineTransformMake(-1, 0, 0, 1, floor(rotatedRect.size.width), 0);
CGContextConcatCTM(bmContext, flipHorizontal);
}
CGContextDrawImage(bmContext,
CGRectMake((rotatedRect.size.width - width)/2.0f,
(rotatedRect.size.height - height)/2.0f,
width,
height),
imgRef);
CGImageRef rotatedImage = CGBitmapContextCreateImage(bmContext);
CFRelease(bmContext);
return rotatedImage;
}
CGColorSpaceRef copyColorSpace(int primaries, int transfer, int matrix)
{
CFStringRef primariesValue = NULL;
switch (primaries)
{
case HB_COLR_PRI_EBUTECH:
primariesValue = kCVImageBufferColorPrimaries_EBU_3213;
break;
case HB_COLR_PRI_SMPTEC:
primariesValue = kCVImageBufferColorPrimaries_SMPTE_C;
break;
case HB_COLR_PRI_BT2020:
primariesValue = kCVImageBufferColorPrimaries_ITU_R_2020;
break;
case HB_COLR_PRI_BT709:
default:
primariesValue = kCVImageBufferColorPrimaries_ITU_R_709_2;
}
CFStringRef transferValue = NULL;
CFNumberRef gammaValue = NULL;
switch (transfer)
{
case HB_COLR_TRA_GAMMA22:
{
transferValue = kCVImageBufferTransferFunction_UseGamma;
Float32 gamma = 2.2;
gammaValue = CFNumberCreate(NULL, kCFNumberFloat32Type, &gamma);
break;
}
case HB_COLR_TRA_GAMMA28:
{
transferValue = kCVImageBufferTransferFunction_UseGamma;
Float32 gamma = 2.8;
gammaValue = CFNumberCreate(NULL, kCFNumberFloat32Type, &gamma);
break;
}
case HB_COLR_TRA_SMPTE240M:
transferValue = kCVImageBufferTransferFunction_SMPTE_240M_1995;
break;
case HB_COLR_TRA_LINEAR:
if (@available(macOS 10.14, *)) {
transferValue = kCVImageBufferTransferFunction_Linear;
break;
}
case HB_COLR_TRA_BT2020_10:
case HB_COLR_TRA_BT2020_12:
transferValue = kCVImageBufferTransferFunction_ITU_R_2020;
break;
case HB_COLR_TRA_SMPTEST2084:
if (@available(macOS 10.13, *)) {
transferValue = kCVImageBufferTransferFunction_SMPTE_ST_2084_PQ;
break;
}
case HB_COLR_TRA_ARIB_STD_B67:
if (@available(macOS 10.13, *)) {
transferValue = kCVImageBufferTransferFunction_ITU_R_2100_HLG;
break;
}
case HB_COLR_TRA_SMPTE428:
if (@available(macOS 10.12, *)) {
transferValue = kCVImageBufferTransferFunction_SMPTE_ST_428_1;
break;
}
case HB_COLR_TRA_BT709:
default:
transferValue = kCVImageBufferTransferFunction_ITU_R_709_2;
}
CFStringRef matrixValue = NULL;
switch (matrix)
{
case HB_COLR_MAT_SMPTE170M:
matrixValue = kCVImageBufferYCbCrMatrix_ITU_R_601_4;
break;
case HB_COLR_MAT_SMPTE240M:
matrixValue = kCVImageBufferYCbCrMatrix_SMPTE_240M_1995;
break;
case HB_COLR_MAT_BT2020_NCL:
case HB_COLR_MAT_BT2020_CL:
matrixValue = kCVImageBufferYCbCrMatrix_ITU_R_2020;
break;
case HB_COLR_MAT_BT709:
default:
matrixValue = kCVImageBufferYCbCrMatrix_ITU_R_709_2;
}
const void *keys[4] = { kCVImageBufferColorPrimariesKey, kCVImageBufferTransferFunctionKey, kCVImageBufferYCbCrMatrixKey, kCVImageBufferGammaLevelKey };
const void *values[4] = { primariesValue, transferValue, matrixValue, gammaValue};
CFDictionaryRef attachments = CFDictionaryCreate(NULL, keys, values, 4, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
CGColorSpaceRef colorSpace = CVImageBufferCreateColorSpaceFromAttachments(attachments);
CFRelease(attachments);
return colorSpace;
}
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