66c2df40c1
* Also enable PNG loading in `view` * Also enable RGBA PNG loading in general
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/* vim: tabstop=4 shiftwidth=4 noexpandtab
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*/
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#ifndef LIB_GRAPHICS_H
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#define LIB_GRAPHICS_H
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#include <syscall.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define GFX_W(ctx) ((ctx)->width) /* Display width */
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#define GFX_H(ctx) ((ctx)->height) /* Display height */
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#define GFX_B(ctx) ((ctx)->depth / 8) /* Display byte depth */
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#define _RED(color) ((color & 0x00FF0000) / 0x10000)
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#define _GRE(color) ((color & 0x0000FF00) / 0x100)
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#define _BLU(color) ((color & 0x000000FF) / 0x1)
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#define _ALP(color) ((color & 0xFF000000) / 0x1000000)
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/*
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* Macros make verything easier.
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*/
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#define GFX(ctx,x,y) *((uint32_t *)&((ctx)->backbuffer)[(GFX_W(ctx) * (y) + (x)) * GFX_B(ctx)])
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#define SPRITE(sprite,x,y) sprite->bitmap[sprite->width * (y) + (x)]
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#define SMASKS(sprite,x,y) sprite->masks[sprite->width * (y) + (x)]
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typedef struct sprite {
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uint16_t width;
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uint16_t height;
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uint32_t * bitmap;
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uint32_t * masks;
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uint32_t blank;
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uint8_t alpha;
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} sprite_t;
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typedef struct context {
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uint16_t width;
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uint16_t height;
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uint16_t depth;
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uint32_t size;
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char * buffer;
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char * backbuffer;
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} gfx_context_t;
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gfx_context_t * init_graphics_fullscreen();
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gfx_context_t * init_graphics_fullscreen_double_buffer();
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#define ALPHA_OPAQUE 0
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#define ALPHA_MASK 1
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#define ALPHA_EMBEDDED 2
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#define ALPHA_INDEXED 3
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uint32_t rgb(uint8_t r, uint8_t g, uint8_t b);
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uint32_t rgba(uint8_t r, uint8_t g, uint8_t b, uint8_t a);
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uint32_t alpha_blend(uint32_t bottom, uint32_t top, uint32_t mask);
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uint32_t alpha_blend_rgba(uint32_t bottom, uint32_t top);
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void flip(gfx_context_t * ctx);
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void clear_buffer(gfx_context_t * ctx);
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void load_sprite(sprite_t * sprite, char * filename);
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int load_sprite_png(sprite_t * sprite, char * file);
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void draw_sprite(gfx_context_t * ctx, sprite_t * sprite, int32_t x, int32_t y);
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void draw_line(gfx_context_t * ctx, int32_t x0, int32_t x1, int32_t y0, int32_t y1, uint32_t color);
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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);
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void draw_fill(gfx_context_t * ctx, uint32_t color);
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void draw_sprite_scaled(gfx_context_t * ctx, sprite_t * sprite, uint16_t x, uint16_t y, uint16_t width, uint16_t height);
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#endif
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