1 files changed, 181 insertions, 0 deletions
diff --git a/im/src/im_dibxbitmap.cpp b/im/src/im_dibxbitmap.cpp
new file mode 100755
index 0000000..8fabd4a
--- /dev/null
+++ b/im/src/im_dibxbitmap.cpp
@@ -0,0 +1,181 @@
+/** \file
+ * \brief Conversion between imDib and imImage
+ *
+ * See Copyright Notice in im_lib.h
+ * $Id: im_dibxbitmap.cpp,v 1.1 2008/10/17 06:10:16 scuri Exp $
+ */
+
+
+#include <windows.h>
+#include <assert.h>
+
+#include "im.h"
+#include "im_image.h"
+#include "im_dib.h"
+#include "im_util.h"
+
+
+void imDibEncodeFromBitmap(imDib* dib, const unsigned char* data)
+{
+  int x, y;
+  BYTE* bits;
+  
+  assert(dib);
+  assert(dib->bmih->biBitCount > 16);
+  assert(data);
+  
+  if (dib->bmih->biHeight < 0)
+    bits = dib->bits + (dib->bits_size - dib->line_size); /* start of last line */
+  else
+    bits = dib->bits;
+  
+  for (y = 0; y < abs(dib->bmih->biHeight); y++)
+  {
+    for (x = 0; x < dib->bmih->biWidth; x++)
+    {
+      *bits++ = *(data+2);   // R
+      *bits++ = *(data+1);   // G
+      *bits++ = *(data+0);   // B
+
+      data += 3;
+
+      if (dib->bmih->biBitCount == 32)
+        *bits++ = *data++;
+    }
+    
+    bits += dib->pad_size;
+
+    if (dib->bmih->biHeight < 0)
+      bits -= 2*dib->line_size;
+  }
+}
+
+void imDibDecodeToBitmap(const imDib* dib, unsigned char* data)
+{
+  int x, y, offset;
+  unsigned short color;
+  BYTE* bits;
+  unsigned int rmask = 0, gmask = 0, bmask = 0, 
+                roff = 0,  goff = 0,  boff = 0; /* pixel bit mask control when reading 16 and 32 bpp images */
+  
+  assert(dib);
+  assert(dib->bmih->biBitCount > 8);
+  assert(data);
+
+  if (dib->bmih->biHeight < 0)
+    bits = dib->bits + (dib->bits_size - dib->line_size); /* start of last line */
+  else
+    bits = dib->bits;
+  
+  if (dib->bmih->biBitCount == 16)
+    offset = dib->line_size;  /* do not increment for each pixel, jump line */
+  else
+    offset = dib->pad_size;   /* increment for each pixel, jump pad */
+  
+  if (dib->bmih->biCompression == BI_BITFIELDS)
+  {
+    unsigned int Mask;
+    unsigned int* palette = (unsigned int*)dib->bmic;
+    
+    rmask = Mask = palette[0];
+    while (!(Mask & 0x01))
+    {Mask >>= 1; roff++;}
+    
+    gmask = Mask = palette[1];
+    while (!(Mask & 0x01))
+    {Mask >>= 1; goff++;}
+    
+    bmask = Mask = palette[2];
+    while (!(Mask & 0x01))
+    {Mask >>= 1; boff++;}
+  }
+  else if (dib->bmih->biBitCount == 16)
+  {
+    bmask = 0x001F;
+    gmask = 0x03E0;
+    rmask = 0x7C00;
+    boff = 0;
+    goff = 5;
+    roff = 10;
+  }
+  
+  for (y = 0; y < abs(dib->bmih->biHeight); y++)
+  {
+    for (x = 0; x < dib->bmih->biWidth; x++)
+    {
+      if (dib->bmih->biBitCount == 16)
+      {
+        color = ((unsigned short*)bits)[x];
+        *data++ = (unsigned char)((((rmask & color) >> roff) * 255) / (rmask >> roff));
+        *data++ = (unsigned char)((((gmask & color) >> goff) * 255) / (gmask >> goff));
+        *data++ = (unsigned char)((((bmask & color) >> boff) * 255) / (bmask >> boff));
+      }
+      else
+      {
+        *(data+2) = *bits++; // B
+        *(data+1) = *bits++; // G
+        *(data+0) = *bits++; // R
+
+        data += 3;
+        
+        if (dib->bmih->biBitCount == 32)
+          *data++ = *bits++;
+      }
+    }
+    
+    bits += offset;
+
+    if (dib->bmih->biHeight < 0)
+      bits -= 2*dib->line_size;
+  }
+}
+
+imImage* imDibToImage(const imDib* dib)
+{
+  assert(dib);
+
+  int color_space = IM_RGB;
+  if (dib->bmih->biBitCount <= 8)
+    color_space = IM_MAP;
+
+  imImage* image = imImageCreate(dib->bmih->biWidth, abs(dib->bmih->biHeight), color_space, IM_BYTE);
+  if (!image) 
+    return NULL;
+
+  if (image->color_space == IM_MAP)
+  {
+    image->palette_count = dib->palette_count;
+    imDibDecodeToMap(dib, (imbyte*)image->data[0], image->palette);
+  }
+  else
+  {
+    imDibDecodeToRGBA(dib, (imbyte*)image->data[0], (imbyte*)image->data[1], (imbyte*)image->data[2], NULL);
+  }
+
+  return image;
+}
+
+imDib* imDibFromImage(const imImage* image)
+{
+  assert(image);
+  assert(imImageIsBitmap(image));
+
+  if (!imImageIsBitmap(image))
+    return NULL;
+
+  int bpp;
+  if (image->color_space != IM_RGB)
+    bpp = 8;
+  else
+    bpp = 24;
+
+  imDib* dib = imDibCreate(image->width, image->height, bpp);     
+  if (!dib) return NULL;
+
+  if (image->color_space != IM_RGB)
+    imDibEncodeFromMap(dib, (const imbyte*)image->data[0], image->palette, image->palette_count);
+  else
+    imDibEncodeFromRGBA(dib, (const imbyte*)image->data[0], (const imbyte*)image->data[1], (const imbyte*)image->data[2], NULL);
+
+  return dib;
+}