143 lines
2.7 KiB
C
143 lines
2.7 KiB
C
//---
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// SDL interface: for rendering tests on computer
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//---
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#ifdef TEX_PLATFORM_SDL
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#include <SDL2/SDL.h>
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#include <stdlib.h>
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#include <TeX/TeX.h>
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#include <TeX/parser.h>
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/* Rendering window and renderer */
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static SDL_Window *w = NULL;
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static SDL_Renderer *r = NULL;
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//---
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// Interface functions
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//---
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/* intf_pixel() - Set a single pixel */
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void intf_pixel(int x, int y, int color)
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{
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int R = color >> 16;
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int G = (color >> 8) & 0xff;
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int B = color & 0xff;
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SDL_SetRenderDrawColor(r, R, G, B, 255);
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SDL_RenderDrawPoint(r, x, y);
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}
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/* intf_line() - Draw a line */
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void intf_line(int x1, int y1, int x2, int y2, int color)
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{
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int R = color >> 16;
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int G = (color >> 8) & 0xff;
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int B = color & 0xff;
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SDL_SetRenderDrawColor(r, R, G, B, 255);
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SDL_RenderDrawLine(r, x1, y1, x2, y2);
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}
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/* intf_size() - Get the dimensions of a string */
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void intf_size(char const *str, int *width, int *height)
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{
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*width = 6 * strlen(str) - 1;
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*height = 7;
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}
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/* intf_text() - Draw variable-width text */
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void intf_text(char const *str, int x, int y, int color)
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{
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int R = color >> 16;
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int G = (color >> 8) & 0xff;
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int B = color & 0xff;
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SDL_SetRenderDrawColor(r, R, G, B, 255);
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SDL_Rect rect = { .x = x, .y = y };
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intf_size(str, &rect.w, &rect.h);
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SDL_RenderDrawRect(r, &rect);
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}
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//---
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// Initialization and finalization
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//---
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__attribute__((constructor))
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static void init(void)
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{
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if(SDL_Init(SDL_INIT_VIDEO) < 0)
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{
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fprintf(stderr, "error: cannot initialize SDL backend: %s\n",
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SDL_GetError());
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exit(1);
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}
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int c = SDL_WINDOWPOS_CENTERED;
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w = SDL_CreateWindow("2D rendering", c, c, 256, 128, 0);
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if(!w)
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{
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fprintf(stderr, "error: cannot create SDL window: %s\n",
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SDL_GetError());
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exit(1);
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}
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r = SDL_CreateRenderer(w, -1, SDL_RENDERER_ACCELERATED);
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if(!r)
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{
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fprintf(stderr, "error: cannot create SDL renderer: %s\n",
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SDL_GetError());
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exit(1);
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}
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SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "0");
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/* Make the window visible */
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SDL_RenderPresent(r);
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/* Set interface functions */
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TeX_intf_pixel(intf_pixel);
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TeX_intf_line(intf_line);
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TeX_intf_size(intf_size);
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TeX_intf_text(intf_text);
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}
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__attribute__((destructor))
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static void fini(void)
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{
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if(w) SDL_DestroyWindow(w);
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SDL_Quit();
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}
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//---
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// Backend example
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//---
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int main(void)
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{
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char const * formula = "\\frac{x_7}{"
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"\\left\\{\\frac{\\frac{2}{3}}{27}\\right\\}^2"
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"}";
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struct TeX_Flow *flow = TeX_parse(formula);
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if(!flow) { puts("parsing error!"); return 1; }
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TeX_debug_flow(flow, 0);
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SDL_SetRenderDrawColor(r, 0xff, 0xff, 0xff, 0xff);
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SDL_RenderClear(r);
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TeX_draw(flow, 10, 10, 0x000000);
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SDL_RenderPresent(r);
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SDL_Event e;
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while(1)
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{
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SDL_WaitEvent(&e);
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if(e.type == SDL_QUIT) break;
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}
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TeX_free(flow);
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return 0;
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}
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#endif /* TEX_PLATFORM_SDL */
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