Add hooks to support outputing images whose pixels are not in block-stream order

Core/include/Image.h

@@ -56,6 +56,7 @@ class Image {
  public:
   Image(const CompressedImage &);
   Image(const ImageLoader &);
+  Image(uint32 width, uint32 height, const uint32 *pixels);
   ~Image();
   
   Image(const Image &);
@@ -69,10 +70,15 @@ class Image {
   uint32 GetWidth() const { return m_Width; }
   uint32 GetHeight() const { return m_Height; }
 
+  void SetBlockStreamOrder(bool flag) { m_bBlockStreamOrder = flag; }
+  bool GetBlockStreamOrder() const { return m_bBlockStreamOrder; }
+
  private:
   uint32 m_Width;
   uint32 m_Height;
 
+  bool m_bBlockStreamOrder;
+
   uint8 *m_PixelData;
 };
 

Core/src/Image.cpp

@@ -56,9 +56,10 @@ static inline T sad( const T &a, const T &b ) {
 }
 
 Image::Image(const Image &other)
-: m_Width(other.m_Width)
-, m_Height(other.m_Height)
-, m_PixelData(new uint8[m_Width * m_Height * 4])
+  : m_Width(other.m_Width)
+  , m_Height(other.m_Height)
+  , m_PixelData(new uint8[m_Width * m_Height * 4])
+  , m_bBlockStreamOrder(other.GetBlockStreamOrder())
 {
   if(m_PixelData) {
     memcpy(m_PixelData, other.m_PixelData, m_Width * m_Height * 4);
@@ -68,10 +69,22 @@ Image::Image(const Image &other)
   }
 }
 
+Image::Image(uint32 width, uint32 height, const uint32 *pixels) 
+  : m_Width(width)
+  , m_Height(height)
+  , m_PixelData(new uint8[4 * m_Width * m_Height])
+  , m_bBlockStreamOrder(false)
+{
+  if(m_PixelData && pixels)
+    memcpy(m_PixelData, pixels, m_Width * m_Height * sizeof(uint32));
+}
+
+
 Image &Image::operator=(const Image &other) {
   
   m_Width = other.m_Width;
   m_Height = other.m_Height;
+  m_bBlockStreamOrder = other.GetBlockStreamOrder();
   
   if(m_PixelData) {
     delete [] m_PixelData;
@@ -94,6 +107,7 @@ Image &Image::operator=(const Image &other) {
 Image::Image(const CompressedImage &ci)
   : m_Width(ci.GetWidth())
   , m_Height(ci.GetHeight())
+  , m_bBlockStreamOrder(true)
 {
   unsigned int bufSz = ci.GetWidth() * ci.GetHeight() * 4;
   m_PixelData = new uint8[ bufSz ];
@@ -109,6 +123,7 @@ Image::Image(const ImageLoader &loader)
   : m_Width(loader.GetWidth())
   , m_Height(loader.GetHeight())
   , m_PixelData(0)
+  , m_bBlockStreamOrder(true)
 {
   if(loader.GetImageData()) {
     m_PixelData = new uint8[ loader.GetImageDataSz() ];

IO/src/ImageWriterPNG.cpp

@@ -86,6 +86,7 @@ public:
 
 ImageWriterPNG::ImageWriterPNG(const Image &im)
   : ImageWriter(im.GetWidth(), im.GetHeight(), im.RawData())
+  , m_bBlockStreamOrder(im.GetBlockStreamOrder())
   , m_StreamPosition(0)
 {
 }
@@ -130,9 +131,14 @@ bool ImageWriterPNG::WriteImage() {
     row_pointers[y] = row;
 
     for (uint32 x = 0; x < m_Width; ++x) {
+      if(m_bBlockStreamOrder) {
         for(uint32 ch = 0; ch < 4; ch++) {
           *row++ = GetChannelForPixel(x, y, ch);
         }
+      } else {
+        *(reinterpret_cast<uint32 *>(row) + x) =
+          (reinterpret_cast<const uint32 *>(m_PixelData))[y * m_Width + x];
+      }
     }
   }
     

IO/src/ImageWriterPNG.h

@@ -55,6 +55,7 @@ class ImageWriterPNG : public ImageWriter {
 
   virtual bool WriteImage();
  private:
+  bool m_bBlockStreamOrder;
   uint32 m_StreamPosition;
   friend class PNGStreamWriter;
 };