submodule/skia/experimental/c-api-example/skia-c-example.c

   1 /*
   2  * Copyright 2015 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7 #include <stdio.h>
   8
   9 #include "include/c/sk_canvas.h"
  10 #include "include/c/sk_data.h"
  11 #include "include/c/sk_image.h"
  12 #include "include/c/sk_imageinfo.h"
  13 #include "include/c/sk_paint.h"
  14 #include "include/c/sk_path.h"
  15 #include "include/c/sk_surface.h"
  16
  17 static sk_surface_t* make_surface(int32_t w, int32_t h) {
  18     sk_imageinfo_t* info = sk_imageinfo_new(w, h, RGBA_8888_SK_COLORTYPE,
  19                                             PREMUL_SK_ALPHATYPE, NULL);
  20     sk_surface_t* result = sk_surface_new_raster(info, NULL);
  21     sk_imageinfo_delete(info);
  22     return result;
  23 }
  24
  25 static void emit_png(const char* path, sk_surface_t* surface) {
  26     sk_image_t* image = sk_surface_new_image_snapshot(surface);
  27     sk_data_t* data = sk_image_encode(image);
  28     sk_image_unref(image);
  29     FILE* f = fopen(path, "wb");
  30     fwrite(sk_data_get_data(data), sk_data_get_size(data), 1, f);
  31     fclose(f);
  32     sk_data_unref(data);
  33 }
  34
  35 void draw(sk_canvas_t* canvas) {
  36     sk_paint_t* fill = sk_paint_new();
  37     sk_paint_set_color(fill, sk_color_set_argb(0xFF, 0x00, 0x00, 0xFF));
  38     sk_canvas_draw_paint(canvas, fill);
  39
  40     sk_paint_set_color(fill, sk_color_set_argb(0xFF, 0x00, 0xFF, 0xFF));
  41     sk_rect_t rect;
  42     rect.left = 100.0f;
  43     rect.top = 100.0f;
  44     rect.right = 540.0f;
  45     rect.bottom = 380.0f;
  46     sk_canvas_draw_rect(canvas, &rect, fill);
  47
  48     sk_paint_t* stroke = sk_paint_new();
  49     sk_paint_set_color(stroke, sk_color_set_argb(0xFF, 0xFF, 0x00, 0x00));
  50     sk_paint_set_antialias(stroke, true);
  51     sk_paint_set_stroke(stroke, true);
  52     sk_paint_set_stroke_width(stroke, 5.0f);
  53
  54     sk_pathbuilder_t* path_builder = sk_pathbuilder_new();
  55     sk_pathbuilder_move_to(path_builder, 50.0f, 50.0f);
  56     sk_pathbuilder_line_to(path_builder, 590.0f, 50.0f);
  57     sk_pathbuilder_cubic_to(path_builder, -490.0f, 50.0f, 1130.0f, 430.0f, 50.0f, 430.0f);
  58     sk_pathbuilder_line_to(path_builder, 590.0f, 430.0f);
  59
  60     sk_path_t* path = sk_pathbuilder_detach_path(path_builder);
  61     sk_canvas_draw_path(canvas, path, stroke);
  62
  63     sk_paint_set_color(fill, sk_color_set_argb(0x80, 0x00, 0xFF, 0x00));
  64     sk_rect_t rect2;
  65     rect2.left = 120.0f;
  66     rect2.top = 120.0f;
  67     rect2.right = 520.0f;
  68     rect2.bottom = 360.0f;
  69     sk_canvas_draw_oval(canvas, &rect2, fill);
  70
  71     sk_pathbuilder_delete(path_builder);
  72     sk_path_delete(path);
  73     sk_paint_delete(stroke);
  74     sk_paint_delete(fill);
  75 }
  76
  77 int main() {
  78     sk_surface_t* surface = make_surface(640, 480);
  79     sk_canvas_t* canvas = sk_surface_get_canvas(surface);
  80     draw(canvas);
  81     emit_png("skia-c-example.png", surface);
  82     sk_surface_unref(surface);
  83     return 0;
  84 }