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#include <stdio.h>
#include <stddef.h>
#include <cairo.h>
#include "render.h"
static int pad = 15;
static void render_color_bar(cairo_t *cr, int x, int y, int w, int h,
double r, double g, double b,
const char *l1, const char *l2)
{
cairo_font_extents_t ext;
cairo_pattern_t *gr;
gr = cairo_pattern_create_linear(x, y+h/2, w, y+h/2);
cairo_pattern_add_color_stop_rgb(gr, 0, 0, 0, 0);
cairo_pattern_add_color_stop_rgb(gr, 1, r, g, b);
cairo_rectangle(cr, x, y, w, h);
cairo_set_source(cr, gr);
cairo_fill(cr);
cairo_pattern_destroy(gr);
cairo_select_font_face(cr, "Liberation Mono",
CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_NORMAL);
if (l2) {
cairo_set_source_rgb(cr, 1, 1, 1);
cairo_set_font_size(cr, h/2 - pad);
cairo_font_extents(cr, &ext);
cairo_move_to(cr, x + pad, y + pad + ext.ascent);
cairo_show_text(cr, l1);
cairo_move_to(cr, x + pad, y + pad + ext.ascent + ext.height);
cairo_show_text(cr, l2);
} else {
cairo_set_source_rgb(cr, r, g, b);
cairo_set_font_size(cr, h - 2*pad);
cairo_font_extents(cr, &ext);
cairo_move_to(cr, x + pad, y + pad + ext.ascent);
cairo_show_text(cr, l1);
}
}
void render_test(cairo_t *cr, int width, int height, const char *l1, const char *l2)
{
int bar = 120;
while (7 * bar + 2 * pad > height &&
bar > 4 * pad)
bar -= 10;
cairo_set_source_rgb(cr, 0, 0, 0);
cairo_rectangle(cr, 0, 0, width, height);
cairo_fill(cr);
cairo_set_line_width(cr, 2);
cairo_set_source_rgb(cr, 1, 1, 1);
cairo_rectangle(cr, pad - 1, pad - 1, width - 2*pad + 2, 7*bar + 2);
cairo_stroke(cr);
render_color_bar(cr, pad, bar * 0 + pad, width - 2*pad, bar,
0.6, 0.6, 0.6, l1, l2);
render_color_bar(cr, pad, bar * 1 + pad, width - 2*pad, bar, 1, 0, 0, "red", NULL);
render_color_bar(cr, pad, bar * 2 + pad, width - 2*pad, bar, 1, 1, 0, "yellow", NULL);
render_color_bar(cr, pad, bar * 3 + pad, width - 2*pad, bar, 0, 1, 0, "green", NULL);
render_color_bar(cr, pad, bar * 4 + pad, width - 2*pad, bar, 0, 1, 1, "cyan", NULL);
render_color_bar(cr, pad, bar * 5 + pad, width - 2*pad, bar, 0, 0, 1, "blue", NULL);
render_color_bar(cr, pad, bar * 6 + pad, width - 2*pad, bar, 1, 0, 1, "magenta", NULL);
cairo_show_page(cr);
}
void render_image(cairo_t *cr, int width, int height, cairo_surface_t *image)
{
double xs, ys, dx, dy;
int iw, ih;
cairo_set_source_rgb(cr, 0, 0, 0);
cairo_rectangle(cr, 0, 0, width, height);
cairo_fill(cr);
iw = cairo_image_surface_get_width(image);
ih = cairo_image_surface_get_height(image);
xs = (double)width / iw;
ys = (double)height / ih;
if (xs > ys) {
xs = ys;
dx = (width - xs * iw) / 2;
dy = 0;
} else {
ys = xs;
dx = 0;
dy = (height - ys * ih) / 2;
}
cairo_translate(cr, dx, dy);
cairo_scale(cr, xs, ys);
cairo_set_source_surface(cr, image, 0, 0);
cairo_rectangle(cr, 0, 0, iw, ih);
cairo_fill(cr);
cairo_show_page(cr);
}
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