improve implementation

ios/GLCanvas.m

@@ -43,7 +43,7 @@ NSArray* diff (NSArray* a, NSArray* b) {
 
   GLRenderData *_renderData;
 
-  NSArray *_contentData;
+  NSArray *_rasterizedContent;
   NSArray *_contentTextures;
   NSDictionary *_images; // This caches the currently used images (imageSrc -> GLReactImage)
 
@@ -88,7 +88,7 @@ RCT_NOT_IMPLEMENTED(-init)
   _images = nil;
   _preloaded = nil;
   _captureConfigs = nil;
-  _contentData = nil;
+  _rasterizedContent = nil;
   _contentTextures = nil;
   _data = nil;
   _renderData = nil;
@@ -323,11 +323,8 @@ RCT_NOT_IMPLEMENTED(-init)
 
 - (void)rasterizeContent
 {
-  // TODO: we need to refactor how this stuff work...
-  // we should no longer do any rasterize work if all the work is to be done in syncContentTextures
-
   RCT_PROFILE_BEGIN_EVENT(0, @"GLCanvas rasterizeContent", nil);
-  NSMutableArray *contentData = [[NSMutableArray alloc] init];
+  NSMutableArray *rasterizedContent = [[NSMutableArray alloc] init];
   int nb = [_nbContentTextures intValue];
   for (int i = 0; i < nb; i++) {
     UIView *view = self.superview.subviews[i]; // We take siblings by index (closely related to the JS code)
@@ -345,9 +342,9 @@ RCT_NOT_IMPLEMENTED(-init)
         imgData = [GLImageData genPixelsWithView:v withPixelRatio:self.contentScaleFactor];
       }
     }
-    if (imgData) contentData[i] = imgData;
+    if (imgData) rasterizedContent[i] = imgData;
   }
-  _contentData = contentData;
+  _rasterizedContent = rasterizedContent;
   [self setNeedsDisplay];
   RCT_PROFILE_END_EVENT(0, @"gl", nil);
 }
@@ -355,7 +352,6 @@ RCT_NOT_IMPLEMENTED(-init)
 - (void)syncContentTextures
 {
   RCT_PROFILE_BEGIN_EVENT(0, @"GLCanvas syncContentTextures", nil);
-  NSMutableArray *contentData = _contentData.mutableCopy;
   unsigned long max = MIN([_nbContentTextures intValue], [_contentTextures count]);
 
   for (int i = 0; i < max; i++) {
@@ -374,16 +370,11 @@ RCT_NOT_IMPLEMENTED(-init)
         [invocation invoke];
         CVPixelBufferRef buffer;
         [invocation getReturnValue:&buffer];
-        
-        int width = (int) CVPixelBufferGetWidth(buffer);
-        int height = (int) CVPixelBufferGetHeight(buffer);
-        contentData[i] = [[GLImageData alloc]
-                   initWithData:CVPixelBufferGetBaseAddress(buffer)
-                   withWidth:width
-                   withHeight:height];
+        [_contentTextures[i] setPixelsWithPixelBuffer:buffer];
+      }
+      else {
+        [_contentTextures[i] setPixels:_rasterizedContent[i]];
       }
-      
-      [_contentTextures[i] setPixels:contentData[i]];
     }
   }
   RCT_PROFILE_END_EVENT(0, @"gl", nil);

ios/GLTexture.h

@@ -14,5 +14,6 @@
 - (void)setShapeWithWidth:(float)width withHeight:(float)height;
 
 - (void)setPixels: (GLImageData *)data;
+- (void)setPixelsWithPixelBuffer: (CVPixelBufferRef)buffer;
 
 @end

ios/GLTexture.m

@@ -6,6 +6,7 @@
 {
   GLuint _handle; // The identifier of the gl texture
   GLImageData* dataCurrentlyUploaded; // The last set data (cache)
+  CVPixelBufferRef bufferCurrentlyUploaded; // The last set buffer (cache)
 }
 
 - (instancetype)init
@@ -21,6 +22,7 @@
 {
   glDeleteTextures(1, &_handle);
   dataCurrentlyUploaded = nil;
+  bufferCurrentlyUploaded = NULL;
 }
 
 - (void) makeTexture
@@ -54,6 +56,7 @@
 - (void)setPixels: (GLImageData *)data
 {
   GLImageData *d = data==nil ? [GLImageData empty] : data;
+  bufferCurrentlyUploaded = NULL;
   if (d != dataCurrentlyUploaded) {
     dataCurrentlyUploaded = d;
     [self bind];
@@ -61,4 +64,23 @@
   }
 }
 
+
+- (void)setPixelsWithPixelBuffer: (CVPixelBufferRef)buffer
+{
+  if (buffer == NULL) {
+    [self setPixels:[GLImageData empty]];
+  }
+  else {
+    dataCurrentlyUploaded = nil;
+    if (buffer != bufferCurrentlyUploaded) {
+      bufferCurrentlyUploaded = buffer;
+      [self bind];
+      int width = (int) CVPixelBufferGetWidth(buffer);
+      int height = (int) CVPixelBufferGetHeight(buffer);
+      GLubyte* data = CVPixelBufferGetBaseAddress(buffer);
+      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE,  data);
+    }
+  }
+}
+
 @end