image laoder

1 files changed, 43 insertions, 11 deletions

diff --git a/render.c b/render.c
index 70f02af..9aac29c 100644
--- a/render.c
+++ b/render.c
@@ -1,3 +1,4 @@
+#include <stdio.h>
 #include <stddef.h>
 #include <cairo.h>
 
@@ -15,9 +16,9 @@ static void render_color_bar(cairo_t *cr, int x, int y, int w, int h,
     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_rectangle(cr, x, y, w, h);
+    cairo_set_source(cr, gr);
+    cairo_fill(cr);
     cairo_pattern_destroy(gr);
 
     cairo_select_font_face(cr, "mono",
@@ -26,7 +27,7 @@ static void render_color_bar(cairo_t *cr, int x, int y, int w, int h,
     if (l2) {
         cairo_set_source_rgb(cr, 1, 1, 1);
         cairo_set_font_size(cr, h/2 - pad);
-        cairo_font_extents (cr, &ext);
+        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);
@@ -34,7 +35,7 @@ static void render_color_bar(cairo_t *cr, int x, int y, int w, int h,
     } else {
         cairo_set_source_rgb(cr, r, g, b);
         cairo_set_font_size(cr, h - 2*pad);
-        cairo_font_extents (cr, &ext);
+        cairo_font_extents(cr, &ext);
         cairo_move_to(cr, x + pad, y + pad + ext.ascent);
         cairo_show_text(cr, l1);
     }
@@ -49,13 +50,13 @@ void render_test(cairo_t *cr, int width, int height, const char *l1, const char
         bar -= 10;
 
     cairo_set_source_rgb(cr, 0, 0, 0);
-    cairo_rectangle (cr, 0, 0, width, height);
-    cairo_fill (cr);
+    cairo_rectangle(cr, 0, 0, width, height);
+    cairo_fill(cr);
 
-    cairo_set_line_width (cr, 1);
-    cairo_set_source_rgb (cr, 1, 1, 1);
-    cairo_rectangle (cr, pad - 0.5, pad - 0.5, width - 2*pad + 1, 7*bar + 1);
-    cairo_stroke (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);
@@ -69,4 +70,35 @@ void render_test(cairo_t *cr, int width, int height, const char *l1, const char
     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);
+}