107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
#include <graphics.h>
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#include <math.h>
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#include <stdlib.h>
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image_data_t image_create(uint16_t width, uint16_t height) {
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image_data_t data;
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data.width = width;
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data.height = height;
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size_t length = width * height * sizeof(image_color_t);
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data.pixels = (image_color_t*)malloc(length);
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memset(data.pixels, 255, length);
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return data;
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}
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void image_free(image_data_t image) {
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if (image.pixels) {
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free(image.pixels);
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}
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}
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static inline void set_point(image_data_t image, uint16_t x, uint16_t y, image_color_t color) {
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image.pixels[x + y * image.width] = color;
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}
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void image_draw_point(image_data_t image, uint16_t x, uint16_t y, image_color_t color) {
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if (x >= image.width || y >= image.height) {
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return;
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}
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set_point(image, x, y, color);
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}
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void image_draw_hline(image_data_t image, uint16_t x1, uint16_t x2, uint16_t y, image_color_t color) {
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if (x1 > x2) {
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uint16_t temp = x1;
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x1 = x2;
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x2 = temp;
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}
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if (x1 > image.width) {
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return;
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}
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x2 = min(x2, image.width);
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do {
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image_draw_point(image, x1++, y, color);
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} while (x1 < x2);
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}
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void image_draw_vline(image_data_t image, uint16_t x, uint16_t y1, uint16_t y2, image_color_t color) {
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if (y1 > y2) {
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uint16_t temp = y1;
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y1 = y2;
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y2 = temp;
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}
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if (y1 > image.width) {
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return;
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}
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y2 = min(y2, image.height);
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do {
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image_draw_point(image, x, y1++, color);
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} while (y1 < y2);
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}
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void image_draw_line(image_data_t image, uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, image_color_t color) {
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int dx = abs(x2 - x1);
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int dy = abs(y2 - y1);
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int sx = (x1 < x2) ? 1 : -1;
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int sy = (y1 < y2) ? 1 : -1;
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int err = dx - dy;
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int e2;
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while (1) {
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if (x1 >= image.width || y1 >= image.height) {
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break;
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}
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set_point(image, x1, y1, color);
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if (x1 == x2 && y1 == y2) {
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break;
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}
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e2 = 2 * err;
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if (e2 > -dy) {
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err -= dy;
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x1 += sx;
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}
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if (e2 < dx) {
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err += dx;
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y1 += sy;
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}
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}
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}
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void image_draw_rect(image_data_t image, uint16_t x, uint16_t y, uint16_t w, uint16_t h, image_color_t color) {
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image_draw_hline(image, x, x + w - 1, y, color);
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image_draw_hline(image, x, x + w, y + h - 1, color);
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image_draw_vline(image, x, y, y + h - 1, color);
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image_draw_vline(image, x + w - 1, y, y + h - 1, color);
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}
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void image_fill_rect(image_data_t image, uint16_t x, uint16_t y, uint16_t w, uint16_t h, image_color_t color) {
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while (h--) {
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image_draw_hline(image, x, x + w, y++, color);
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};
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}
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