int
main (int argc, char **argv)
{
GpImage *img;
gunichar2 *unis;
GpBitmap *bitmap;
GpStatus status;
int original_palette_size;
int reloaded_palette_size;
ColorPalette *original_palette;
ColorPalette *reloaded_palette;
GdiplusStartupInput gdiplusStartupInput;
ULONG_PTR gdiplusToken;
PixelFormat pixel_format;
ARGB color;
GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
// PNG resave should preserve the palette transparency. Let's test it
// by loading a PNG file and its palette, then resaving it and loading
// it again for comparison.
unis = g_utf8_to_utf16 ("test-trns.png", -1, NULL, NULL, NULL);
status = GdipLoadImageFromFile (unis, &img);
CHECK_STATUS(1);
g_free (unis);
status = GdipGetImagePaletteSize (img, &original_palette_size);
CHECK_STATUS(1);
CHECK_ASSERT(original_palette_size > 0);
original_palette = malloc (original_palette_size);
GdipGetImagePalette (img, original_palette, original_palette_size);
CHECK_STATUS(1);
unis = g_utf8_to_utf16 ("test-trns-resave.png", -1, NULL, NULL, NULL);
status = GdipSaveImageToFile (img, unis, &png_clsid, NULL);
CHECK_STATUS(1);
GdipDisposeImage (img);
status = GdipLoadImageFromFile (unis, &img);
CHECK_STATUS(1);
g_free (unis);
status = GdipGetImagePaletteSize (img, &reloaded_palette_size);
CHECK_STATUS(1);
CHECK_ASSERT(reloaded_palette_size > 0);
CHECK_ASSERT(reloaded_palette_size == original_palette_size);
reloaded_palette = malloc (reloaded_palette_size);
GdipGetImagePalette (img, reloaded_palette, reloaded_palette_size);
CHECK_STATUS(1);
CHECK_ASSERT(memcmp (original_palette, reloaded_palette, original_palette_size) == 0);
GdipDisposeImage (img);
img = NULL;
unlink ("test-trns-resave.png");
free (original_palette);
free (reloaded_palette);
// Test grayscale image with alpha channel. The image should be converted
// into 32-bit ARGB format and the alpha channel should be preserved.
unis = g_utf8_to_utf16 ("test-gsa.png", -1, NULL, NULL, NULL);
status = GdipCreateBitmapFromFile (unis, &bitmap);
CHECK_STATUS(1);
g_free (unis);
status = GdipGetImagePixelFormat (bitmap, &pixel_format);
CHECK_STATUS(1);
CHECK_ASSERT(pixel_format == PixelFormat32bppARGB);
status = GdipBitmapGetPixel (bitmap, 0, 0, &color);
CHECK_STATUS(1);
CHECK_ASSERT(color == 0xffffff);
status = GdipBitmapGetPixel (bitmap, 1, 7, &color);
CHECK_STATUS(1);
CHECK_ASSERT(color == 0xe8b3b3b3);
GdipDisposeImage (bitmap);
return 0;
}
int ReadTextureFromFile( struct Texture * t, const char * filename )
{
int i;
HGLOBAL hMem;
LPVOID pMemImage;
IStream *pStm;
struct GdiplusStartupInput gdiplusStartupInput;
ULONG_PTR gdiplusToken;
GpBitmap *pImg;
PixelFormat PixelFormat;
//Read in data
FILE * f = fopen( filename, "rb");
if( !f )
{
fprintf( stderr, "Error: Could not open %s\n", filename );
return -1;
}
fseek(f,0,SEEK_END);
int l = ftell( f );
unsigned char * buffer = malloc( l );
fseek(f,0,SEEK_SET);
fread(buffer, l, 1, f );
fclose( f );
//Prepare GDI+ imaging
hMem = GlobalAlloc( GMEM_MOVEABLE, l );
pMemImage = GlobalLock( hMem);
memcpy( pMemImage, buffer, l );
GlobalUnlock( hMem );
//XXX: This requries OLE32, do we really want it?
CreateStreamOnHGlobal( hMem, TRUE, &pStm );
gdiplusStartupInput.GdiplusVersion = 1;
gdiplusStartupInput.DebugEventCallback = NULL;
gdiplusStartupInput.SuppressBackgroundThread = FALSE;
gdiplusStartupInput.SuppressExternalCodecs = FALSE;
GdiplusStartup( &gdiplusToken, &gdiplusStartupInput, NULL );
if( GdipCreateBitmapFromStream( pStm, &pImg ) )
{
fprintf( stderr, "Error: cannot decode: %s\n", filename );
return -2;
}
GdipGetImagePixelFormat( (GpImage *)pImg, &PixelFormat );
UINT width;
UINT height;
GdipGetImageHeight( (GpImage *)pImg, &height );
GdipGetImageWidth( (GpImage *)pImg, &width );
GpRect r;
r.X = 0;
r.Y = 0;
r.Width = width;
r.Height = height;
BitmapData bd;
enum TextureType format;
GLenum type; //Almost always GL_TEXTURE_2D (Could be GL_TEXTURE_3D)
GLuint texture;
int slot; //which texture slot (For multi-texturing)
uint8_t * rawdata; //May be other types, too!
t->width = width;
t->height = height;
t->type = GL_TEXTURE_2D;
//Detect if has alpha or not...
int ps;
if( PixelFormat & PixelFormatAlpha )
{
GdipBitmapLockBits(pImg,&r,ImageLockModeRead,PixelFormat32bppARGB,&bd);
ps = 4;
t->format = TTRGBA;
}
else
{
GdipBitmapLockBits(pImg,&r,ImageLockModeRead,PixelFormat24bppRGB,&bd);
ps = 3;
t->format = TTRGB;
}
t->rawdata = malloc( ps * width * height );
int x, y;
if( ps == 3 )
{
for( y = 0; y < height; y++ )
for( x = 0; x < width; x++ )
{
t->rawdata[(x+y*width)*3+0] = ((unsigned char*)bd.Scan0)[x*3+y*bd.Stride+2];
t->rawdata[(x+y*width)*3+1] = ((unsigned char*)bd.Scan0)[x*3+y*bd.Stride+1];
t->rawdata[(x+y*width)*3+2] = ((unsigned char*)bd.Scan0)[x*3+y*bd.Stride+0];
}
}
else //ps = 4
{
for( y = 0; y < height; y++ )
for( x = 0; x < width; x++ )
{
t->rawdata[(x+y*width)*4+0] = ((unsigned char*)bd.Scan0)[x*4+y*bd.Stride+2];
t->rawdata[(x+y*width)*4+1] = ((unsigned char*)bd.Scan0)[x*4+y*bd.Stride+1];
t->rawdata[(x+y*width)*4+2] = ((unsigned char*)bd.Scan0)[x*4+y*bd.Stride+0];
t->rawdata[(x+y*width)*4+3] = ((unsigned char*)bd.Scan0)[x*4+y*bd.Stride+3];
}
}
GdipBitmapUnlockBits(pImg, &bd );
GdipDisposeImage( (GpImage *)pImg );
GdiplusShutdown( gdiplusToken );
return 0;
}
