gonna fer un commit per si reventa algo: estic a meitat implementar surfaces

source/gif.h

@@ -0,0 +1,65 @@
+#pragma once
+
+#include <stdint.h>
+
+#define EXTENSION_INTRODUCER   0x21
+#define IMAGE_DESCRIPTOR       0x2C
+#define TRAILER                0x3B
+#define GRAPHIC_CONTROL        0xF9
+#define APPLICATION_EXTENSION  0xFF
+#define COMMENT_EXTENSION      0xFE
+#define PLAINTEXT_EXTENSION    0x01
+
+#define READ(dst, size) memcpy(dst, buffer, size); buffer += size
+
+typedef struct {
+    unsigned short width;
+    unsigned short height;
+    unsigned char fields;
+    unsigned char background_color_index;
+    unsigned char pixel_aspect_ratio;
+} screen_descriptor_t;
+
+typedef struct {
+    unsigned char r, g, b;
+} rgb;
+
+typedef struct {
+    unsigned short image_left_position;
+    unsigned short image_top_position;
+    unsigned short image_width;
+    unsigned short image_height;
+    unsigned char fields;
+} image_descriptor_t;
+
+typedef struct {
+    unsigned char byte;
+    int prev;
+    int len;
+} dictionary_entry_t;
+
+typedef struct {
+    unsigned char extension_code;
+    unsigned char block_size;
+} extension_t;
+
+typedef struct {
+    unsigned char fields;
+    unsigned short delay_time;
+    unsigned char transparent_color_index;
+} graphic_control_extension_t;
+
+typedef struct {
+    unsigned char application_id[8];
+    unsigned char version[3];
+} application_extension_t;
+
+typedef struct {
+    unsigned short left, top, width, height;
+    unsigned char cell_width, cell_height;
+    unsigned char foreground_color, background_color;
+} plaintext_extension_t;
+
+void uncompress(int code_length, const unsigned char *input, int input_length, unsigned char *out);
+uint32_t* LoadPalette(unsigned char *buffer);
+unsigned char* LoadGif(unsigned char *buffer, unsigned short* w, unsigned short* h);