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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 "hb.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;
}
static CGColorSpaceRef copyColorSpaceOld(int colorPrimaries)
{
const CGFloat whitePoint[] = {0.95047, 1.0, 1.08883};
const CGFloat blackPoint[] = {0, 0, 0};
// See https://developer.apple.com/library/content/technotes/tn2257/_index.html
const CGFloat gamma[] = {1.961, 1.961, 1.961};
// RGB/XYZ Matrices (D65 white point)
switch (colorPrimaries) {
case HB_COLR_PRI_EBUTECH:
{
// Rec. 601, 625 line
const CGFloat matrix[] = {0.4305538, 0.2220043, 0.0201822,
0.3415498, 0.7066548, 0.1295534,
0.1783523, 0.0713409, 0.9393222};
return CGColorSpaceCreateCalibratedRGB(whitePoint, blackPoint, gamma, matrix);
}
case HB_COLR_PRI_SMPTEC:
{
// Rec. 601, 525 line
const CGFloat matrix[] = {0.3935209, 0.2123764, 0.0187391,
0.3652581, 0.7010599, 0.1119339,
0.1916769, 0.0865638, 0.9583847};
return CGColorSpaceCreateCalibratedRGB(whitePoint, blackPoint, gamma, matrix);
}
case HB_COLR_PRI_BT2020:
{
// Rec. 2020
const CGFloat matrix[] = {0.6369580, 0.2627002, 0.0000000,
0.1446169, 0.6779981, 0.0280727,
0.1688810, 0.0593017, 1.0609851};
return CGColorSpaceCreateCalibratedRGB(whitePoint, blackPoint, gamma, matrix);
}
case HB_COLR_PRI_BT709:
default:
{
// Rec. 709
const CGFloat matrix[] = {0.4124564, 0.2126729, 0.0193339,
0.3575761, 0.7151522, 0.1191920,
0.1804375, 0.0721750, 0.9503041};
return CGColorSpaceCreateCalibratedRGB(whitePoint, blackPoint, gamma, matrix);
}
}
}
CGColorSpaceRef copyColorSpace(int primaries, int transfer, int matrix)
{
if (NSAppKitVersionNumber < NSAppKitVersionNumber10_11)
{
return copyColorSpaceOld(primaries);
}
CFStringRef primariesKey = NULL;
switch (primaries)
{
case HB_COLR_PRI_EBUTECH:
primariesKey = kCVImageBufferColorPrimaries_EBU_3213;
break;
case HB_COLR_PRI_SMPTEC:
primariesKey = kCVImageBufferColorPrimaries_SMPTE_C;
break;
case HB_COLR_PRI_BT2020:
primariesKey = kCVImageBufferColorPrimaries_ITU_R_2020;
break;
case HB_COLR_PRI_BT709:
default:
primariesKey = kCVImageBufferColorPrimaries_ITU_R_709_2;
}
CFStringRef transferKey = NULL;
switch (transfer)
{
case HB_COLR_TRA_SMPTE240M:
transferKey = kCVImageBufferTransferFunction_SMPTE_240M_1995;
break;
case HB_COLR_TRA_BT2020_10:
case HB_COLR_TRA_BT2020_12:
transferKey = kCVImageBufferTransferFunction_ITU_R_2020;
break;
case HB_COLR_TRA_SMPTEST2084:
transferKey = CFSTR("SMPTE_ST_2084_PQ"); //kCVImageBufferTransferFunction_SMPTE_ST_2084_PQ;
break;
case HB_COLR_TRA_ARIB_STD_B67:
transferKey = CFSTR("ITU_R_2100_HLG"); //kCVImageBufferTransferFunction_ITU_R_2100_HLG;
break;
case HB_COLR_TRA_BT709:
default:
transferKey = kCVImageBufferTransferFunction_ITU_R_709_2;
}
CFStringRef matrixKey = NULL;
switch (matrix)
{
case HB_COLR_MAT_SMPTE170M:
matrixKey = kCVImageBufferYCbCrMatrix_ITU_R_601_4;
break;
case HB_COLR_MAT_SMPTE240M:
matrixKey = kCVImageBufferYCbCrMatrix_SMPTE_240M_1995;
break;
case HB_COLR_MAT_BT2020_NCL:
case HB_COLR_MAT_BT2020_CL:
matrixKey = kCVImageBufferYCbCrMatrix_ITU_R_2020;
break;
case HB_COLR_MAT_BT709:
default:
matrixKey = kCVImageBufferYCbCrMatrix_ITU_R_709_2;;
}
const void *keys[3] = { kCVImageBufferColorPrimariesKey, kCVImageBufferTransferFunctionKey, kCVImageBufferYCbCrMatrixKey };
const void *values[3] = { primariesKey, transferKey, matrixKey};
CFDictionaryRef attachments = CFDictionaryCreate(NULL, keys, values, 3, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
CGColorSpaceRef colorSpace = CVImageBufferCreateColorSpaceFromAttachments(attachments);
CFRelease(attachments);
return colorSpace;
}
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