#include <image.h>
//#include <image_sif.h>
+// === STRUCTURES ===
+struct sHeader
+{
+ uint16_t Magic;
+ uint16_t Flags;
+ uint16_t Width;
+ uint16_t Height;
+};
+
+// === CONSTANTS ===
+
// === CODE ===
int SoMain(void)
{
*/
tImage *Image_SIF_Parse(void *Buffer, size_t Size)
{
- uint16_t magic;
- uint16_t flags;
uint16_t w, h;
int ofs, i;
- tImage_SIF *ret;
+ tImage *ret;
int bRevOrder;
int fileOfs = 0;
int comp, fmt;
int sampleSize = 4;
+ struct sHeader *hdr = Buffer;
+
+ _SysDebug("Image_SIF_Parse: (Buffer=%p, Size=0x%x)", Buffer, Size);
// Get magic word and determine byte ordering
- magic = *(uint16_t*)Buffer+fileOfs; fileOfs += 2;
- if(magic == 0x51F0)
+ if(hdr->Magic == 0x51F0) // Little Endian
bRevOrder = 0;
- else if(magic == 0xF051)
+ else if(hdr->Magic == 0xF051) // Big Endian
bRevOrder = 1;
else {
return NULL;
}
+ _SysDebug(" Image_SIF_Parse: bRevOrder = %i", bRevOrder);
+
// Read flags
- flags = *(uint16_t*)Buffer+fileOfs; fileOfs += 2;
- comp = flags & 7;
- fmt = (flags >> 3) & 7;
+ comp = hdr->Flags & 7;
+ fmt = (hdr->Flags >> 3) & 7;
// Read dimensions
- w = *(uint16_t*)Buffer+fileOfs; fileOfs += 2;
- h = *(uint16_t*)Buffer+fileOfs; fileOfs += 2;
+ w = hdr->Width;
+ h = hdr->Height;
-
- // Allocate space
- ret = calloc(1, sizeof(tImage) + w * h * sampleSize);
- ret->Width = w;
- ret->Height = h;
+ _SysDebug(" Image_SIF_Parse: Dimensions %ix%i", w, h);
// Get image format
switch(fmt)
{
- case 0: // ARGB
- ret->Format = IMGFMT_ARGB;
+ case 0: // ARGB 32-bit Little Endian
+ fmt = IMGFMT_BGRA;
sampleSize = 4;
break;
- case 1: // RGB
- ret->Format = IMGFMT_RGB;
+ case 1: // RGB 24-bit big endian
+ fmt = IMGFMT_RGB;
sampleSize = 3;
break;
default:
- free(ret);
return NULL;
}
+ _SysDebug(" Image_SIF_Parse: sampleSize = %i, fmt = %i", sampleSize, fmt);
+
+ fileOfs = sizeof(struct sHeader);
+
+ // Allocate space
+ ret = calloc(1, sizeof(tImage) + w * h * sampleSize);
+ ret->Width = w;
+ ret->Height = h;
+ ret->Format = fmt;
+
switch(comp)
{
// Uncompressed 32-bpp data
uint8_t len;
if( fileOfs + 1 > Size ) return ret;
len = *(uint8_t*)Buffer+fileOfs; fileOfs += 1;
+ // Verbatim
if(len & 0x80) {
len &= 0x7F;
if( fileOfs + len*sampleSize > Size ) {
}
ofs += len;
}
+ // RLE
else {
uint8_t tmp[sampleSize];
return ret;
// Channel 1.7.8 RLE
+ // - Each channel is separately 1.7 RLE compressed
case 3:
// Alpha, Red, Green, Blue
for( i = 0; i < sampleSize; i++ )