[BMP] fixed info return for negative height

[IMG] fixed system_bpp to 4 instead of 32

Author: Diego Ferrari

shared/image/bmp.c

@@ -29,7 +29,7 @@ image_info bmp_get_info(void * file, size_t size){
     bmp_header *header = (bmp_header*)file;
     return (image_info){
         .width = header->width,
-        .height = header->height
+        .height = abs(header->height)
     };
 }
 

shared/image/image.h

@@ -8,7 +8,7 @@ typedef enum IMAGE_FORMATS {
 } IMAGE_FORMATS;
 
 #define ARGB(a,r,g,b) ((a & 0xFF) << 24) | ((r & 0xFF) << 16) | ((g & 0xFF) << 8) | (b & 0xFF)
-#define system_bpp 32
+#define system_bpp 4
 
 typedef struct image_info {
     uint32_t width, height;