toaruos/userspace/lib/graphics.h
Kevin Lange 66c2df40c1 Fix alpha blending for RGBA destinations.
* Also enable PNG loading in `view`
* Also enable RGBA PNG loading in general
2012-09-13 23:22:38 -07:00

72 lines
2.2 KiB
C

/* vim: tabstop=4 shiftwidth=4 noexpandtab
*/
#ifndef LIB_GRAPHICS_H
#define LIB_GRAPHICS_H
#include <syscall.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define GFX_W(ctx) ((ctx)->width) /* Display width */
#define GFX_H(ctx) ((ctx)->height) /* Display height */
#define GFX_B(ctx) ((ctx)->depth / 8) /* Display byte depth */
#define _RED(color) ((color & 0x00FF0000) / 0x10000)
#define _GRE(color) ((color & 0x0000FF00) / 0x100)
#define _BLU(color) ((color & 0x000000FF) / 0x1)
#define _ALP(color) ((color & 0xFF000000) / 0x1000000)
/*
* Macros make verything easier.
*/
#define GFX(ctx,x,y) *((uint32_t *)&((ctx)->backbuffer)[(GFX_W(ctx) * (y) + (x)) * GFX_B(ctx)])
#define SPRITE(sprite,x,y) sprite->bitmap[sprite->width * (y) + (x)]
#define SMASKS(sprite,x,y) sprite->masks[sprite->width * (y) + (x)]
typedef struct sprite {
uint16_t width;
uint16_t height;
uint32_t * bitmap;
uint32_t * masks;
uint32_t blank;
uint8_t alpha;
} sprite_t;
typedef struct context {
uint16_t width;
uint16_t height;
uint16_t depth;
uint32_t size;
char * buffer;
char * backbuffer;
} gfx_context_t;
gfx_context_t * init_graphics_fullscreen();
gfx_context_t * init_graphics_fullscreen_double_buffer();
#define ALPHA_OPAQUE 0
#define ALPHA_MASK 1
#define ALPHA_EMBEDDED 2
#define ALPHA_INDEXED 3
uint32_t rgb(uint8_t r, uint8_t g, uint8_t b);
uint32_t rgba(uint8_t r, uint8_t g, uint8_t b, uint8_t a);
uint32_t alpha_blend(uint32_t bottom, uint32_t top, uint32_t mask);
uint32_t alpha_blend_rgba(uint32_t bottom, uint32_t top);
void flip(gfx_context_t * ctx);
void clear_buffer(gfx_context_t * ctx);
void load_sprite(sprite_t * sprite, char * filename);
int load_sprite_png(sprite_t * sprite, char * file);
void draw_sprite(gfx_context_t * ctx, sprite_t * sprite, int32_t x, int32_t y);
void draw_line(gfx_context_t * ctx, int32_t x0, int32_t x1, int32_t y0, int32_t y1, uint32_t color);
void draw_line_thick(gfx_context_t * ctx, int32_t x0, int32_t x1, int32_t y0, int32_t y1, uint32_t color, char thickness);
void draw_fill(gfx_context_t * ctx, uint32_t color);
void draw_sprite_scaled(gfx_context_t * ctx, sprite_t * sprite, uint16_t x, uint16_t y, uint16_t width, uint16_t height);
#endif