fix RGBA -> RGB conversion

Author: awxkee

JxlCoder.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
     s.name             = 'JxlCoder'
-    s.version          = '1.3.2'
+    s.version          = '1.3.3'
     s.summary          = 'JXL coder for iOS and MacOS'
     s.description      = 'Provides support for JXL files in iOS and MacOS'
     s.homepage         = 'https://github.com/awxkee/jxl-coder-swift'

Sources/jxlc/JXLSystemImage.mm

@@ -50,7 +50,6 @@ -(bool)unpremultiply:(nonnull unsigned char*)data width:(NSInteger)width height:
     return true;
 }
 
-
 #if TARGET_OS_OSX
 
 -(nullable CGImageRef)makeCGImage {

Sources/jxlc/RgbRgbaConverter.mm

@@ -48,8 +48,8 @@ @implementation RgbRgbaConverter: NSObject
         .height = static_cast<vImagePixelCount>(height),
         .rowBytes = static_cast<vImagePixelCount>(width * 3)
     };
-    uint8_t fillColor = 0x0000000;
-    vImage_Error vEerror = vImageFlatten_RGBA8888ToRGB888(&src, &dest, &fillColor, false, kvImageNoFlags);
+    Pixel_8888 fillColor = {0x00, 0x00, 0x00, 0xFF};
+    vImage_Error vEerror = vImageFlatten_RGBA8888ToRGB888(&src, &dest, fillColor, true, kvImageNoFlags);
     if (vEerror != kvImageNoError) {
         dstVector.resize(1);
         return dstVector;
@@ -58,7 +58,7 @@ @implementation RgbRgbaConverter: NSObject
 }
 
 +(bool)convertRGBU16ToRGBAU16:(uint16_t*)src dst:(uint16_t*)dst width:(int)width height:(int)height depth:(int)depth {
-    uint16_t whiteColor = (uint16_t)(powf(2.0f, (float)depth) - 1);
+    Pixel_16U whiteColor = (uint16_t)(powf(2.0f, (float)depth) - 1);
     vImage_Buffer srcBuffer = {
         .data = (void*)src,
         .width = static_cast<vImagePixelCount>(width),
@@ -80,7 +80,7 @@ +(bool)convertRGBU16ToRGBAU16:(uint16_t*)src dst:(uint16_t*)dst width:(int)width
 }
 
 +(bool)convertRGBU8ToRGBAU8:(uint8_t*)src dst:(uint8_t*)dst width:(int)width height:(int)height; {
-    uint16_t whiteColor = (uint16_t)(powf(2.0f, (float)8) - 1);
+    Pixel_16U whiteColor = (uint16_t)(powf(2.0f, (float)8) - 1);
     vImage_Buffer srcBuffer = {
         .data = (void*)src,
         .width = static_cast<vImagePixelCount>(width),