improved shade-lut generation

[gbajam21] / tools / pngdump / image.h

diff --git a/tools/pngdump/image.h b/tools/pngdump/image.h
index 7a42fba..f86de94 100644 (file)
--- a/tools/pngdump/image.h
+++ b/tools/pngdump/image.h
@@ -1,6 +1,8 @@
 #ifndef IMAGE_H_
 #define IMAGE_H_
 
+#include <stdio.h>
+
 struct cmapent {
        unsigned char r, g, b;
 };
@@ -9,7 +11,8 @@ struct image {
        int width, height;
        int bpp;
        int nchan;
-       int scansz, pitch;
+       int scansz;     /* scanline size in bytes */
+       int pitch;      /* bytes from one scanline to the next */
        int cmap_ncolors;
        struct cmapent cmap[256];
        unsigned char *pixels;
@@ -18,10 +21,18 @@ struct image {
 int alloc_image(struct image *img, int x, int y, int bpp);
 int load_image(struct image *img, const char *fname);
 int save_image(struct image *img, const char *fname);
+int save_image_file(struct image *img, FILE *fp);
 
 int cmp_image(struct image *a, struct image *b);
 
 void blit(struct image *src, int sx, int sy, int w, int h, struct image *dst, int dx, int dy);
 void overlay_key(struct image *src, unsigned int key, struct image *dst);
 
+unsigned int get_pixel(struct image *img, int x, int y);
+unsigned int get_pixel_rgb(struct image *img, int x, int y, unsigned int *rgb);
+void put_pixel(struct image *img, int x, int y, unsigned int pix);
+
+int quantize_image(struct image *img, int maxcol);
+int gen_shades(struct image *img, int levels, int maxcol, int *shade_lut);
+
 #endif /* IMAGE_H_ */