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Added a high pass and a low pass filter. Fixed compilation issues wit…
…h GPUImageBuffer on older Xcode versions.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| #import "GPUImageFilterGroup.h" | ||
| #import "GPUImageLowPassFilter.h" | ||
| #import "GPUImageDifferenceBlendFilter.h" | ||
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| @interface GPUImageHighPassFilter : GPUImageFilterGroup | ||
| { | ||
| GPUImageLowPassFilter *lowPassFilter; | ||
| GPUImageDifferenceBlendFilter *differenceBlendFilter; | ||
| } | ||
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| // This controls the degree by which the previous accumulated frames are blended and then subtracted from the current one. This ranges from 0.0 to 1.0, with a default of 0.5. | ||
| @property(readwrite, nonatomic) CGFloat filterStrength; | ||
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|
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| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| #import "GPUImageHighPassFilter.h" | ||
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| @implementation GPUImageHighPassFilter | ||
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| - (id)init; | ||
| { | ||
| if (!(self = [super init])) | ||
| { | ||
| return nil; | ||
| } | ||
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| // Start with a low pass filter to define the component to be removed | ||
| lowPassFilter = [[GPUImageLowPassFilter alloc] init]; | ||
| [self addFilter:lowPassFilter]; | ||
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| // Take the difference of the current frame from the low pass filtered result to get the high pass | ||
| differenceBlendFilter = [[GPUImageDifferenceBlendFilter alloc] init]; | ||
| [self addFilter:differenceBlendFilter]; | ||
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| // Texture location 0 needs to be the original image for the difference blend | ||
| [lowPassFilter addTarget:differenceBlendFilter atTextureLocation:1]; | ||
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| self.initialFilters = [NSArray arrayWithObjects:lowPassFilter, differenceBlendFilter, nil]; | ||
| self.terminalFilter = differenceBlendFilter; | ||
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| self.filterStrength = 0.5; | ||
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| return self; | ||
| } | ||
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| #pragma mark - | ||
| #pragma mark Accessors | ||
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| - (void)setFilterStrength:(CGFloat)newValue; | ||
| { | ||
| lowPassFilter.filterStrength = newValue; | ||
| } | ||
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| - (CGFloat)filterStrength; | ||
| { | ||
| return lowPassFilter.filterStrength; | ||
| } | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| #import "GPUImageFilterGroup.h" | ||
| #import "GPUImageBuffer.h" | ||
| #import "GPUImageDissolveBlendFilter.h" | ||
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| @interface GPUImageLowPassFilter : GPUImageFilterGroup | ||
| { | ||
| GPUImageBuffer *bufferFilter; | ||
| GPUImageDissolveBlendFilter *dissolveBlendFilter; | ||
| } | ||
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| // This controls the degree by which the previous accumulated frames are blended with the current one. This ranges from 0.0 to 1.0, with a default of 0.5. | ||
| @property(readwrite, nonatomic) CGFloat filterStrength; | ||
|
|
||
| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| #import "GPUImageLowPassFilter.h" | ||
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| @implementation GPUImageLowPassFilter | ||
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| - (id)init; | ||
| { | ||
| if (!(self = [super init])) | ||
| { | ||
| return nil; | ||
| } | ||
|
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| // Take in the frame and blend it with the previous one | ||
| dissolveBlendFilter = [[GPUImageDissolveBlendFilter alloc] init]; | ||
| [self addFilter:dissolveBlendFilter]; | ||
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| // Buffer the result to be fed back into the blend | ||
| bufferFilter = [[GPUImageBuffer alloc] init]; | ||
| [self addFilter:bufferFilter]; | ||
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| // Texture location 0 needs to be the original image for the dissolve blend | ||
| [bufferFilter addTarget:dissolveBlendFilter atTextureLocation:1]; | ||
| [dissolveBlendFilter addTarget:bufferFilter]; | ||
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| [dissolveBlendFilter disableSecondFrameCheck]; | ||
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| // To prevent double updating of this filter, disable updates from the sharp image side | ||
| // self.inputFilterToIgnoreForUpdates = unsharpMaskFilter; | ||
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| self.initialFilters = [NSArray arrayWithObject:dissolveBlendFilter]; | ||
| self.terminalFilter = dissolveBlendFilter; | ||
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| self.filterStrength = 0.5; | ||
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| return self; | ||
| } | ||
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| #pragma mark - | ||
| #pragma mark Accessors | ||
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| - (void)setFilterStrength:(CGFloat)newValue; | ||
| { | ||
| dissolveBlendFilter.mix = newValue; | ||
| } | ||
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| - (CGFloat)filterStrength; | ||
| { | ||
| return dissolveBlendFilter.mix; | ||
| } | ||
|
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| @end |
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