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examples/FilterShowcase/FilterShowcase/ShowcaseFilterViewController.h
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| #import "GPUImageFilter.h" | ||
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| @interface GPUImageCropFilter : GPUImageFilter | ||
| { | ||
| } | ||
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| // The crop region is the rectangle within the image to crop. It is normalized to a coordinate space from 0.0 to 1.0, with 0.0, 0.0 being the upper left corner of the image | ||
| @property(readwrite, nonatomic) CGRect cropRegion; | ||
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| // Initialization and teardown | ||
| - (id)initWithCropRegion:(CGRect)newCropRegion; | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| #import "GPUImageCropFilter.h" | ||
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| NSString *const kGPUImageCropFragmentShaderString = SHADER_STRING | ||
| ( | ||
| varying highp vec2 textureCoordinate; | ||
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| uniform sampler2D inputImageTexture; | ||
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| void main() | ||
| { | ||
| gl_FragColor = texture2D(inputImageTexture, textureCoordinate); | ||
| } | ||
| ); | ||
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| @implementation GPUImageCropFilter | ||
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| @synthesize cropRegion = _cropRegion; | ||
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| #pragma mark - | ||
| #pragma mark Initialization and teardown | ||
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| - (id)initWithCropRegion:(CGRect)newCropRegion; | ||
| { | ||
| if (!(self = [super initWithFragmentShaderFromString:kGPUImageCropFragmentShaderString])) | ||
| { | ||
| return nil; | ||
| } | ||
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| self.cropRegion = newCropRegion; | ||
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| return self; | ||
| } | ||
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| - (id)init; | ||
| { | ||
| if (!(self = [self initWithCropRegion:CGRectMake(0.0, 0.0, 1.0, 1.0)])) | ||
| { | ||
| return nil; | ||
| } | ||
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| return self; | ||
| } | ||
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| #pragma mark - | ||
| #pragma mark GPUImageInput | ||
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| //- (void)setInputSize:(CGSize)newSize; | ||
| //{ | ||
| // CGSize croppedSize; | ||
| // croppedSize.width = newSize.width * _cropRegion.size.width; | ||
| // croppedSize.height = newSize.height * _cropRegion.size.height; | ||
| // | ||
| // inputTextureSize = croppedSize; | ||
| //} | ||
| // | ||
| - (void)newFrameReady; | ||
| { | ||
| static const GLfloat cropSquareVertices[] = { | ||
| -1.0f, -1.0f, | ||
| 1.0f, -1.0f, | ||
| -1.0f, 1.0f, | ||
| 1.0f, 1.0f, | ||
| }; | ||
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| GLfloat cropTextureCoordinates[] = { | ||
| _cropRegion.origin.x, _cropRegion.origin.y, | ||
| CGRectGetMaxX(_cropRegion), _cropRegion.origin.y, | ||
| _cropRegion.origin.x, CGRectGetMaxY(_cropRegion), | ||
| CGRectGetMaxX(_cropRegion), CGRectGetMaxY(_cropRegion), | ||
| }; | ||
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| [self renderToTextureWithVertices:cropSquareVertices textureCoordinates:cropTextureCoordinates sourceTexture:filterSourceTexture]; | ||
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| [self informTargetsAboutNewFrame]; | ||
| } | ||
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| @end |
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