From 7d1f7592a01aa446507654cb620f8ae79d51c6a5 Mon Sep 17 00:00:00 2001
From: Brad Larson <larson@sunsetlakesoftware.com>
Date: Mon, 28 Jan 2013 19:54:54 -0600
Subject: [PATCH] Fixed the Lanczos resampling filter.

---
 .../ShowcaseFilterViewController.m            |  3 +-
 .../Source/GPUImageLanczosResamplingFilter.m  | 33 +++++++++++++++++++
 framework/Source/GPUImageTwoPassFilter.m      |  7 ++--
 3 files changed, 37 insertions(+), 6 deletions(-)

diff --git a/examples/FilterShowcase/FilterShowcase/ShowcaseFilterViewController.m b/examples/FilterShowcase/FilterShowcase/ShowcaseFilterViewController.m
index f014ccebe..4f95a9207 100755
--- a/examples/FilterShowcase/FilterShowcase/ShowcaseFilterViewController.m
+++ b/examples/FilterShowcase/FilterShowcase/ShowcaseFilterViewController.m
@@ -1506,7 +1506,8 @@ - (IBAction)updateFilterFromSlider:(id)sender;
         case GPUIMAGE_MOSAIC:  [(GPUImageMosaicFilter *)filter setDisplayTileSize:CGSizeMake([(UISlider *)sender value], [(UISlider *)sender value])]; break;
         case GPUIMAGE_VIGNETTE: [(GPUImageVignetteFilter *)filter setVignetteEnd:[(UISlider *)sender value]]; break;
         case GPUIMAGE_GAUSSIAN: [(GPUImageGaussianBlurFilter *)filter setBlurSize:[(UISlider*)sender value]]; break;
-        case GPUIMAGE_BILATERAL: [(GPUImageBilateralFilter *)filter setBlurSize:[(UISlider*)sender value]]; break;
+//        case GPUIMAGE_BILATERAL: [(GPUImageBilateralFilter *)filter setBlurSize:[(UISlider*)sender value]]; break;
+        case GPUIMAGE_BILATERAL: [(GPUImageBilateralFilter *)filter setDistanceNormalizationFactor:[(UISlider*)sender value]]; break;
         case GPUIMAGE_FASTBLUR: [(GPUImageFastBlurFilter *)filter setBlurPasses:round([(UISlider*)sender value])]; break;
 //        case GPUIMAGE_FASTBLUR: [(GPUImageFastBlurFilter *)filter setBlurSize:[(UISlider*)sender value]]; break;
         case GPUIMAGE_OPACITY:  [(GPUImageOpacityFilter *)filter setOpacity:[(UISlider *)sender value]]; break;
diff --git a/framework/Source/GPUImageLanczosResamplingFilter.m b/framework/Source/GPUImageLanczosResamplingFilter.m
index 4c5658d31..24c6dd56f 100644
--- a/framework/Source/GPUImageLanczosResamplingFilter.m
+++ b/framework/Source/GPUImageLanczosResamplingFilter.m
@@ -123,4 +123,37 @@ - (void)setupFilterForSize:(CGSize)filterFrameSize;
     });
 }
 
+// The first pass (vertical) of the resampling needs to be shrunk in only one dimension so that the remaining shrinkage can be performed in the horizonal pass
+- (void)setFilterFBO;
+{
+    CGSize currentFBOSize = [self sizeOfFBO];
+    if (GPUImageRotationSwapsWidthAndHeight(inputRotation))
+    {
+        currentFBOSize.height = self.originalImageSize.height;
+    }
+    else
+    {
+        currentFBOSize.width = self.originalImageSize.width;
+    }
+
+    if (!filterFramebuffer)
+    {
+        if ([GPUImageOpenGLESContext supportsFastTextureUpload] && preparedToCaptureImage)
+        {
+            preparedToCaptureImage = NO;
+            [super createFilterFBOofSize:currentFBOSize];
+            preparedToCaptureImage = YES;
+        }
+        else
+        {
+            [super createFilterFBOofSize:currentFBOSize];
+        }
+        [self setupFilterForSize:currentFBOSize];
+    }
+    
+    glBindFramebuffer(GL_FRAMEBUFFER, filterFramebuffer);
+    
+    glViewport(0, 0, (int)currentFBOSize.width, (int)currentFBOSize.height);
+}
+
 @end
diff --git a/framework/Source/GPUImageTwoPassFilter.m b/framework/Source/GPUImageTwoPassFilter.m
index 4f20cd453..27ef39e5f 100755
--- a/framework/Source/GPUImageTwoPassFilter.m
+++ b/framework/Source/GPUImageTwoPassFilter.m
@@ -271,9 +271,10 @@ - (void)destroyFilterFBO;
 
 - (void)setFilterFBO;
 {
+    CGSize currentFBOSize = [self sizeOfFBO];
+
     if (!filterFramebuffer)
     {
-        CGSize currentFBOSize = [self sizeOfFBO];
         if ([GPUImageOpenGLESContext supportsFastTextureUpload] && preparedToCaptureImage)
         {
             preparedToCaptureImage = NO;
@@ -289,7 +290,6 @@ - (void)setFilterFBO;
     
     glBindFramebuffer(GL_FRAMEBUFFER, filterFramebuffer);
     
-    CGSize currentFBOSize = [self sizeOfFBO];
     glViewport(0, 0, (int)currentFBOSize.width, (int)currentFBOSize.height);
 }
 
@@ -305,9 +305,6 @@ - (void)setSecondFilterFBO;
     glBindFramebuffer(GL_FRAMEBUFFER, secondFilterFramebuffer);
     CGSize currentFBOSize = [self sizeOfFBO];
     glViewport(0, 0, (int)currentFBOSize.width, (int)currentFBOSize.height);
-
-//    CGSize currentFBOSize = [self sizeOfFBO];
-//    glViewport(0, 0, (int)currentFBOSize.width, (int)currentFBOSize.height);
 }
 
 - (void)setOutputFBO;