tools: bmp2tiles better warning and error handling

diff --git a/tools/bmp2tiles/bmp2tiles.c b/tools/bmp2tiles/bmp2tiles.c
index c64c252..abc8576 100644 (file)
--- a/tools/bmp2tiles/bmp2tiles.c
+++ b/tools/bmp2tiles/bmp2tiles.c
@@ -37,12 +37,12 @@ int set_info(swan_gfx_t * gfx, SDL_Surface * img)
        gfx->bpp = img->format->BitsPerPixel;
 
        if (gfx->bpp != 8) {
-               fprintf(stderr, "warning: %d bpp format detected\n", img->format->BitsPerPixel);
+               fprintf(stderr, "error: %d bpp format detected\n", img->format->BitsPerPixel);
                return -1;
        }
 
        if (gfx->width % 8 | gfx->height % 8) {
-               fprintf(stderr, "warning: image not multiple of 16x16 tiles\n \
+               fprintf(stderr, "error: image not multiple of 16x16 tiles\n \
                                width: %d\theight: %d\n", gfx->width, gfx->height);
                return -1;
        }
@@ -68,6 +68,8 @@ void generate_4bpp_tile(unsigned char *buf, swan_gfx_t * gfx,
        for (int i = 0; i < TILE_SZ; i+=4) {
                for (int j = 0; j < 4; ++j) {
                        if (packed) { /* packed format */
+                               if (ptr[0] >= 8 || ptr[1] >= 8) 
+                                       fprintf(stdout, "warning: too many colors detected\n");
                                gfx->outpal[ptr[0]] = (gfx->palette[ptr[0]].r >> 4) << 8 |
                                                      (gfx->palette[ptr[0]].g >> 4) << 4 |
                                                      gfx->palette[ptr[0]].b >> 4;
@@ -76,6 +78,8 @@ void generate_4bpp_tile(unsigned char *buf, swan_gfx_t * gfx,
                                ptr += 2;
                        } else { /* planar format */
                                for (int x = 0; x < 8; ++x) {
+                                       if (ptr[x] >= 8) 
+                                               fprintf(stdout, "warning: too many colors detected\n");
                                        buf[i + j] = ptr[x] << j; 
                                }
                        }