This is working out pretty well now

bin/Makefile

@@ -4,7 +4,7 @@ CC		= $(CROSS)cc
 
 INCLUDE_PATH	= ../include
 
-CFLAGS		+= -I$(INCLUDE_PATH)
+CFLAGS		+= -fPIC -Wall -O2 -I$(INCLUDE_PATH)
 LDFLAGS		=
 
 CAMMY		= cammy
@@ -12,7 +12,7 @@ CAMMY_OBJS	= main.o export.o import.o dither.o
 
 CAMMY_HEADERS	= commands.h
 
-CAMMY_LDFLAGS	= ../src/libcammy.a -lz
+CAMMY_LDFLAGS	= ../src/libcammy.a -lz -lm
 
 PROGRAMS	= cammy
 

src/image.c

@@ -10,7 +10,11 @@
 #include <cammy/screen.h>
 #include <cammy/image.h>
 
-#include "pnglite.h"
+#define STB_IMAGE_IMPLEMENTATION
+#define STB_IMAGE_WRITE_IMPLEMENTATION
+
+#include "stb_image.h"
+#include "stb_image_write.h"
 
 static uint32_t bayer_matrix[256] = {
     /*
@@ -120,7 +124,7 @@ static inline void buf_write(uint8_t *buf,
 
 static inline size_t size_2bpp_tile(size_t width, size_t height) {
     size_t tiles_width  = width  >> 3,
-            tiles_height = height >> 3;
+           tiles_height = height >> 3;
 
     if (width  & 7) tiles_width++;
     if (height & 7) tiles_height++;
@@ -166,14 +170,16 @@ int cammy_image_init(cammy_image *image,
         if ((image->buf = malloc(size)) == NULL) {
             goto error_malloc_buf;
         }
-    }
 
-    memset(image->buf, '\0', size);
+        memset(image->buf, '\xff', size);
+    }
 
     if (palette == NULL) {
         palette = default_palette;
     }
 
+    memcpy(&image->palette, palette, sizeof(image->palette));
+
     image->format = format;
     image->size   = size;
     image->width  = width;
@@ -269,18 +275,17 @@ error_open:
 }
 
 static cammy_image *load_png(const char *file) {
-    png_t png;
-
+    uint8_t *buf;
     cammy_image *image;
     cammy_image_format format = CAMMY_IMAGE_NONE;
 
-    png_init(malloc, free);
+    int width, height, channels;
 
-    if (png_open_file_read(&png, file) < 0) {
-        goto error_png_open_file_read;
+    if ((buf = stbi_load(file, &width, &height, &channels, 4)) == NULL) {
+        goto error_stbi_load;
     }
 
-    switch (png.bpp) {
+    switch (channels) {
         case 3:
             format = CAMMY_IMAGE_24BPP_RGB;
             break;
@@ -294,35 +299,24 @@ static cammy_image *load_png(const char *file) {
             goto error_invalid_format;
     }
 
-    if ((image = cammy_image_new(format,
-                                 NULL,
-                                 png.width,
-                                 png.height)) == NULL) {
-        goto error_image_new;
+    if ((image = malloc(sizeof(*image))) == NULL) {
+        goto error_malloc_image;
     }
 
-    printf("Got buf %p size %zu\n", image->buf, image->size);
-
-    if (png_get_data(&png, image->buf) < 0) {
-        goto error_png_get_data;
+    if (cammy_image_init(image, format, default_palette, width, height, buf) < 0) {
+        goto error_image_init;
     }
 
-    printf("Still here\n");
-
-    png_close_file(&png);
-
-    printf("Hmmst\n");
-
     return image;
 
-error_png_get_data:
-    cammy_image_destroy(image);
+error_image_init:
+    free(image);
 
-error_image_new:
 error_invalid_format:
-    png_close_file(&png);
+error_malloc_image:
+    free(buf);
 
-error_png_open_file_read:
+error_stbi_load:
     return NULL;
 }
 
@@ -356,11 +350,11 @@ cammy_image *cammy_image_open(const char *file) {
 
     return loader(file);
 
-error_invalid_format:
 error_read:
 error_lseek:
     close(fd);
 
+error_invalid_format:
 error_open:
     return NULL;
 }
@@ -412,60 +406,34 @@ error_open:
     return -1;
 }
 
-static inline void format_info_png(cammy_image_format format,
-                                   int *depth,
-                                   int *color) {
+static inline int format_channels(cammy_image_format format) {
     switch (format) {
         case CAMMY_IMAGE_24BPP_RGB:
-            if (depth) *depth = 3;
-            if (color) *color = PNG_TRUECOLOR;
-
-            break;
+            return 3;
 
         case CAMMY_IMAGE_32BPP_RGBA:
-            if (depth) *depth = 4;
-            if (color) *color = PNG_TRUECOLOR_ALPHA;
-
-            break;
+            return 4;
 
         default:
-            if (depth) *depth = 0;
-            if (color) *color = 0;
-
-            break;
+            return 0;
     }
 }
 
 static int save_png(cammy_image *image, const char *file) {
-    png_t png;
+    int channels = format_channels(image->format);
 
-    int depth, color;
-
-    format_info_png(image->format, &depth, &color);
-
-    png_init(malloc, free);
-
-    if (png_open_file_write(&png, file) < 0) {
-        goto error_png_open_file_write;
+    if (!stbi_write_png(file,
+                        image->width,
+                        image->height,
+                        channels,
+                        image->buf,
+                        channels * image->width)) {
+        goto error_stbi_write_png;
     }
 
-    if (png_set_data(&png,
-                     image->width,
-                     image->height,
-                     depth,
-                     color,
-                     image->buf) < 0) {
-        goto error_png_set_data;
-    }
-
-    png_close_file(&png);
-
     return 0;
 
-error_png_set_data:
-    png_close_file(&png);
-
-error_png_open_file_write:
+error_stbi_write_png:
     return -1;
 }
 
@@ -555,9 +523,7 @@ static void copy_buf(cammy_image *dest,
                      cammy_image_region *from) {
     size_t x, y;
 
-    int depth, color;
-
-    format_info_png(dest->format, &depth, &color);
+    int channels = format_channels(dest->format);
 
     for (y=0; y < from->height; y++) {
         if (to->y + y > dest->height) {
@@ -575,13 +541,13 @@ static void copy_buf(cammy_image *dest,
                      from->x + x,
                      from->y + y,
                      from->width,
-                     &r, &g, &b, depth);
+                     &r, &g, &b, channels);
 
             buf_write(dest->buf,
                       to->x + x,
                       to->y + y,
                       dest->width,
-                      r, g, b, depth);
+                      r, g, b, channels);
         }
     }
 }
@@ -591,9 +557,7 @@ static void copy_rgb_to_2bpp_tile(cammy_image *dest,
                                   cammy_image_region *from) {
     size_t x, y;
 
-    int depth, color;
-
-    format_info_png(dest->format, &depth, &color);
+    int channels = format_channels(src->format);
 
     for (y=0; y < from->height; y++) {
         if (to->y + y > dest->height) {
@@ -611,14 +575,14 @@ static void copy_rgb_to_2bpp_tile(cammy_image *dest,
                      from->x + x,
                      from->y + y,
                      from->width,
-                     &r, &g, &b, depth);
+                     &r, &g, &b, channels);
 
             tile_write((cammy_tile *)dest->buf,
                        to->x + x,
                        to->y + y,
                        dest->width,
                        rgb_to_tile_2bpp(r, g, b, to->x + x,
-                                                 to->y + y) ^ 3);
+                                                 to->y + y));
         }
     }
 }
@@ -629,9 +593,7 @@ static void copy_2bpp_tile_to_rgb(cammy_image *dest,
                                   cammy_image_region *from) {
     size_t x, y;
 
-    int depth, color;
-
-    format_info_png(dest->format, &depth, &color);
+    int channels = format_channels(dest->format);
 
     for (y=0; y < from->height; y++) {
         if (to->y + y > dest->height) {
@@ -657,7 +619,7 @@ static void copy_2bpp_tile_to_rgb(cammy_image *dest,
                       src->palette[c].r,
                       src->palette[c].g,
                       src->palette[c].b,
-                      depth);
+                      channels);
         }
     }
 }