#import "GPUImageCropFilter.h"
|
|
#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
|
NSString *const kGPUImageCropFragmentShaderString = SHADER_STRING
|
(
|
varying highp vec2 textureCoordinate;
|
|
uniform sampler2D inputImageTexture;
|
|
void main()
|
{
|
gl_FragColor = texture2D(inputImageTexture, textureCoordinate);
|
}
|
);
|
#else
|
NSString *const kGPUImageCropFragmentShaderString = SHADER_STRING
|
(
|
varying vec2 textureCoordinate;
|
|
uniform sampler2D inputImageTexture;
|
|
void main()
|
{
|
gl_FragColor = texture2D(inputImageTexture, textureCoordinate);
|
}
|
);
|
#endif
|
|
@interface GPUImageCropFilter ()
|
|
- (void)calculateCropTextureCoordinates;
|
|
@end
|
|
@interface GPUImageCropFilter()
|
{
|
CGSize originallySuppliedInputSize;
|
}
|
|
@end
|
|
@implementation GPUImageCropFilter
|
|
@synthesize cropRegion = _cropRegion;
|
|
#pragma mark -
|
#pragma mark Initialization and teardown
|
|
- (id)initWithCropRegion:(CGRect)newCropRegion;
|
{
|
if (!(self = [super initWithFragmentShaderFromString:kGPUImageCropFragmentShaderString]))
|
{
|
return nil;
|
}
|
|
self.cropRegion = newCropRegion;
|
|
return self;
|
}
|
|
- (id)init;
|
{
|
if (!(self = [self initWithCropRegion:CGRectMake(0.0, 0.0, 1.0, 1.0)]))
|
{
|
return nil;
|
}
|
|
return self;
|
}
|
|
#pragma mark -
|
#pragma mark Rendering
|
|
- (void)setInputSize:(CGSize)newSize atIndex:(NSInteger)textureIndex;
|
{
|
if (self.preventRendering)
|
{
|
return;
|
}
|
|
// if (overrideInputSize)
|
// {
|
// if (CGSizeEqualToSize(forcedMaximumSize, CGSizeZero))
|
// {
|
// return;
|
// }
|
// else
|
// {
|
// CGRect insetRect = AVMakeRectWithAspectRatioInsideRect(newSize, CGRectMake(0.0, 0.0, forcedMaximumSize.width, forcedMaximumSize.height));
|
// inputTextureSize = insetRect.size;
|
// return;
|
// }
|
// }
|
|
CGSize rotatedSize = [self rotatedSize:newSize forIndex:textureIndex];
|
originallySuppliedInputSize = rotatedSize;
|
|
CGSize scaledSize;
|
scaledSize.width = rotatedSize.width * _cropRegion.size.width;
|
scaledSize.height = rotatedSize.height * _cropRegion.size.height;
|
|
|
if (CGSizeEqualToSize(scaledSize, CGSizeZero))
|
{
|
inputTextureSize = scaledSize;
|
}
|
else if (!CGSizeEqualToSize(inputTextureSize, scaledSize))
|
{
|
inputTextureSize = scaledSize;
|
}
|
}
|
|
#pragma mark -
|
#pragma mark GPUImageInput
|
|
- (void)calculateCropTextureCoordinates;
|
{
|
CGFloat minX = _cropRegion.origin.x;
|
CGFloat minY = _cropRegion.origin.y;
|
CGFloat maxX = CGRectGetMaxX(_cropRegion);
|
CGFloat maxY = CGRectGetMaxY(_cropRegion);
|
|
switch(inputRotation)
|
{
|
case kGPUImageNoRotation: // Works
|
{
|
cropTextureCoordinates[0] = minX; // 0,0
|
cropTextureCoordinates[1] = minY;
|
|
cropTextureCoordinates[2] = maxX; // 1,0
|
cropTextureCoordinates[3] = minY;
|
|
cropTextureCoordinates[4] = minX; // 0,1
|
cropTextureCoordinates[5] = maxY;
|
|
cropTextureCoordinates[6] = maxX; // 1,1
|
cropTextureCoordinates[7] = maxY;
|
}; break;
|
case kGPUImageRotateLeft: // Fixed
|
{
|
cropTextureCoordinates[0] = maxY; // 1,0
|
cropTextureCoordinates[1] = 1.0 - maxX;
|
|
cropTextureCoordinates[2] = maxY; // 1,1
|
cropTextureCoordinates[3] = 1.0 - minX;
|
|
cropTextureCoordinates[4] = minY; // 0,0
|
cropTextureCoordinates[5] = 1.0 - maxX;
|
|
cropTextureCoordinates[6] = minY; // 0,1
|
cropTextureCoordinates[7] = 1.0 - minX;
|
}; break;
|
case kGPUImageRotateRight: // Fixed
|
{
|
cropTextureCoordinates[0] = minY; // 0,1
|
cropTextureCoordinates[1] = 1.0 - minX;
|
|
cropTextureCoordinates[2] = minY; // 0,0
|
cropTextureCoordinates[3] = 1.0 - maxX;
|
|
cropTextureCoordinates[4] = maxY; // 1,1
|
cropTextureCoordinates[5] = 1.0 - minX;
|
|
cropTextureCoordinates[6] = maxY; // 1,0
|
cropTextureCoordinates[7] = 1.0 - maxX;
|
}; break;
|
case kGPUImageFlipVertical: // Works for me
|
{
|
cropTextureCoordinates[0] = minX; // 0,1
|
cropTextureCoordinates[1] = maxY;
|
|
cropTextureCoordinates[2] = maxX; // 1,1
|
cropTextureCoordinates[3] = maxY;
|
|
cropTextureCoordinates[4] = minX; // 0,0
|
cropTextureCoordinates[5] = minY;
|
|
cropTextureCoordinates[6] = maxX; // 1,0
|
cropTextureCoordinates[7] = minY;
|
}; break;
|
case kGPUImageFlipHorizonal: // Works for me
|
{
|
cropTextureCoordinates[0] = maxX; // 1,0
|
cropTextureCoordinates[1] = minY;
|
|
cropTextureCoordinates[2] = minX; // 0,0
|
cropTextureCoordinates[3] = minY;
|
|
cropTextureCoordinates[4] = maxX; // 1,1
|
cropTextureCoordinates[5] = maxY;
|
|
cropTextureCoordinates[6] = minX; // 0,1
|
cropTextureCoordinates[7] = maxY;
|
}; break;
|
case kGPUImageRotate180: // Fixed
|
{
|
cropTextureCoordinates[0] = maxX; // 1,1
|
cropTextureCoordinates[1] = maxY;
|
|
cropTextureCoordinates[2] = minX; // 0,1
|
cropTextureCoordinates[3] = maxY;
|
|
cropTextureCoordinates[4] = maxX; // 1,0
|
cropTextureCoordinates[5] = minY;
|
|
cropTextureCoordinates[6] = minX; // 0,0
|
cropTextureCoordinates[7] = minY;
|
}; break;
|
case kGPUImageRotateRightFlipVertical: // Fixed
|
{
|
cropTextureCoordinates[0] = minY; // 0,0
|
cropTextureCoordinates[1] = 1.0 - maxX;
|
|
cropTextureCoordinates[2] = minY; // 0,1
|
cropTextureCoordinates[3] = 1.0 - minX;
|
|
cropTextureCoordinates[4] = maxY; // 1,0
|
cropTextureCoordinates[5] = 1.0 - maxX;
|
|
cropTextureCoordinates[6] = maxY; // 1,1
|
cropTextureCoordinates[7] = 1.0 - minX;
|
}; break;
|
case kGPUImageRotateRightFlipHorizontal: // Fixed
|
{
|
cropTextureCoordinates[0] = maxY; // 1,1
|
cropTextureCoordinates[1] = 1.0 - minX;
|
|
cropTextureCoordinates[2] = maxY; // 1,0
|
cropTextureCoordinates[3] = 1.0 - maxX;
|
|
cropTextureCoordinates[4] = minY; // 0,1
|
cropTextureCoordinates[5] = 1.0 - minX;
|
|
cropTextureCoordinates[6] = minY; // 0,0
|
cropTextureCoordinates[7] = 1.0 - maxX;
|
}; break;
|
}
|
}
|
|
- (void)newFrameReadyAtTime:(CMTime)frameTime atIndex:(NSInteger)textureIndex;
|
{
|
static const GLfloat cropSquareVertices[] = {
|
-1.0f, -1.0f,
|
1.0f, -1.0f,
|
-1.0f, 1.0f,
|
1.0f, 1.0f,
|
};
|
|
[self renderToTextureWithVertices:cropSquareVertices textureCoordinates:cropTextureCoordinates];
|
|
[self informTargetsAboutNewFrameAtTime:frameTime];
|
}
|
|
#pragma mark -
|
#pragma mark Accessors
|
|
- (void)setCropRegion:(CGRect)newValue;
|
{
|
NSParameterAssert(newValue.origin.x >= 0 && newValue.origin.x <= 1 &&
|
newValue.origin.y >= 0 && newValue.origin.y <= 1 &&
|
newValue.size.width >= 0 && newValue.size.width <= 1 &&
|
newValue.size.height >= 0 && newValue.size.height <= 1);
|
|
_cropRegion = newValue;
|
[self calculateCropTextureCoordinates];
|
}
|
|
- (void)setInputRotation:(GPUImageRotationMode)newInputRotation atIndex:(NSInteger)textureIndex;
|
{
|
[super setInputRotation:newInputRotation atIndex:textureIndex];
|
[self calculateCropTextureCoordinates];
|
}
|
|
@end
|
