Mercurial > molko
view src/libmlk-core/core/painter.c @ 320:8f9937403749
misc: improve loading of data
author | David Demelier <markand@malikania.fr> |
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date | Fri, 01 Oct 2021 20:30:00 +0200 |
parents | libmlk-core/core/painter.c@d01e83210ca2 |
children | 460c78706989 |
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/* * painter.c -- basic drawing routines * * Copyright (c) 2020-2021 David Demelier <markand@malikania.fr> * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include <math.h> #include "color.h" #include "painter.h" #include "texture.h" #include "window.h" #include "window_p.h" /* Current texture renderer. */ static struct texture *renderer; struct texture * painter_get_target(void) { return renderer; } void painter_set_target(struct texture *tex) { renderer = tex; SDL_SetRenderTarget(RENDERER(), tex ? tex->handle : NULL); } unsigned long painter_get_color(void) { Uint8 r = 0, g = 0, b = 0, a = 0; SDL_GetRenderDrawColor(RENDERER(), &r, &g, &b, &a); return COLOR_HEX(r, g, b, a); } void painter_set_color(unsigned long color) { SDL_SetRenderDrawColor( RENDERER(), COLOR_R(color), COLOR_G(color), COLOR_B(color), COLOR_A(color) ); } void painter_draw_line(int x1, int y1, int x2, int y2) { SDL_RenderDrawLine(RENDERER(), x1, y1, x2, y2); } void painter_draw_point(int x1, int y1) { SDL_RenderDrawPoint(RENDERER(), x1, y1); } void painter_draw_rectangle(int x, int y, unsigned int width, unsigned int height) { const SDL_Rect rect = { .w = width, .h = height, .x = x, .y = y }; SDL_RenderFillRect(RENDERER(), &rect); } void painter_draw_circle(int x, int y, int radius) { // Note that there is more to altering the bitrate of this // method than just changing this value. See how pixels are // altered at the following web page for tips: // http://www.libsdl.org/intro.en/usingvideo.html for (double dy = 1; dy <= radius; dy += 1.0) { double dx = floor(sqrt((2.0 * radius * dy) - (dy * dy))); SDL_RenderDrawLine(RENDERER(), x - dx, y + dy - radius, x + dx, y + dy - radius); SDL_RenderDrawLine(RENDERER(), x - dx, y - dy + radius, x + dx, y - dy + radius); } } void painter_clear(void) { SDL_RenderClear(RENDERER()); } void painter_present(void) { SDL_RenderPresent(RENDERER()); }