try Skia

build/build.rb

@@ -1,7 +1,7 @@
 #!/usr/bin/env ruby
 # $:.unshift(File.expand_path("./dopebuild", __dir__))
 # require 'pry'
-# require 'debug'
+require 'debug'
 
 require_relative './dopebuild.rb'
 
@@ -13,12 +13,25 @@
 conf.require_lib!('freetype2')
 conf.require_lib!('cairo')
 
+# To use this:
+# Download prebuilt Skia binaries here: https://github.com/JetBrains/skia-pack/releases
+# e.g. Skia-m132-a00c390e98-1-macos-Debug-arm64.zip
+# then unzip it into under ~/Downloads/_skia
+#
+conf.require_lib_2!('skia', "#{ENV['HOME']}/Downloads/_skia", [
+  ''
+],
+['out/Debug-macos-arm64'],
+[
+  'skia'
+])
+
 # include_video = (ENV['WITH_VIDEO'] == 'true')
 
 conf.build_files = [
-  'font.c',
+  'font.cpp',
   'layer_ext.c',
-  'surface.c',
+  'surface.cpp',
   'window.c',
   'timer.c',
 ]

build/dopebuild.rb

@@ -56,12 +56,17 @@ def generate_ninja
 
       lines << ''
 
+      cc_cpp_args = \
+        if RUBY_PLATFORM =~ /darwin/
+          "-fdeclspec $cflags -c $in -o $out"
+        else
+          "-fdeclspec -fPIC $cflags -c $in -o $out"
+        end
+
       lines << 'rule cc'
-      if RUBY_PLATFORM =~ /darwin/
-        lines << "  command = #{bin :cc} -fdeclspec $cflags -c $in -o $out"
-      else
-        lines << "  command = #{bin :cc} -fdeclspec -fPIC $cflags -c $in -o $out"
-      end
+      lines << "  command = #{bin :cc} #{cc_cpp_args}"
+      lines << 'rule cpp'
+      lines << "  command = #{bin :cpp} -std=c++20 #{cc_cpp_args}"
 
       lines << 'rule lcc'
       if RUBY_PLATFORM =~ /darwin/
@@ -76,7 +81,13 @@ def generate_ninja
       build_files.each do |file|
         ext = File.extname(file)
         only_file = file[0...(-ext.length)]
-        lines << "build out/#{only_file}.o: cc ext/#{file}"
+
+        compiler = {
+          '.c' => 'cc',
+          '.cpp' => 'cpp',
+        }.fetch(ext)
+
+        lines << "build out/#{only_file}.o: #{compiler} ext/#{file}"
         out_files << "out/#{only_file}.o"
       end
 
@@ -95,6 +106,7 @@ def detect_bins
       set_bin(:pkg_config, detect_bin!('pkg-config', 'Install it via brew install pkg-config'))
       set_bin(:ninja, detect_bin!('ninja', 'Install it via brew install ninja'))
       set_bin(:cc, detect_bin_one_of!(%w(clang-15 clang gcc cc)))
+      set_bin(:cpp, detect_bin_one_of!(%w(clang++ g++)))
     end
 
     def detect_ruby
@@ -156,6 +168,21 @@ def require_lib!(name)
       }
     end
 
+    def require_lib_2!(name, base_path, includes, lib_rel_paths, link_libs)
+      cflags = includes.map do |ri|
+        "-I#{File.join(base_path, ri).chomp('/')}"
+      end.join(' ')
+
+      libs = lib_rel_paths.map do |lp|
+        "-L" + File.join(base_path, lp).chomp('/')
+      end
+      libs << link_libs.map{ |x| "-l#{x}" }
+
+      libs = libs.join(' ')
+
+      @libs[name.to_sym] = { cflags:, libs: }
+    end
+
     private
 
     def set_bin(name, value)

examples/gen_video/main.rb

@@ -79,7 +79,7 @@ def draw_all(time)
     @particles.each do |par|
       @sf.identity
       @sf.translate(par[:x] + 32, par[:y] + 32)
-      @sf.rotate(par[:life] * Math::PI * 2.0)
+      # @sf.rotate(par[:life] * Math::PI * 2.0)
       @sf.blit_surface(par[:sprite], -32, -32)
     end
     @sf.identity

ext/font.c → ext/font.cpp

@@ -254,7 +254,11 @@ static VALUE
 t_font_size_set(VALUE self, VALUE _size) {
   DECLAREFONT(self);
   font->size = (float)NUM2DBL(_size);
-  FT_Set_Char_Size(font->face, 0, (int)(font->size * 64.0), 128, 128);
+  FT_Set_Char_Size((FT_Face)font->face,
+    (FT_F26Dot6)0,
+    (FT_F26Dot6)(font->size * 64.0),
+    (FT_UInt)128,
+    (FT_UInt)128);
   return Qnil;
 }
 
@@ -277,6 +281,7 @@ static VALUE t_font__color_set(VALUE self, VALUE _value) {
 
 ////////////////////////////////////////////////////////////////////////
 
+extern "C"
 void
 LAO_Font_Init() {
   cLayerFont = rb_define_class_under(cLayer, "Font", rb_cObject);

ext/surface.c → ext/surface.cpp

@@ -1,4 +1,6 @@
+// extern "C" {
 #include "surface.h"
+//  }
 
 extern VALUE cLayer;
 VALUE cLayerSurface;
@@ -74,6 +76,15 @@ t_sfc_allocator(VALUE klass) {
   // return TypedData_Make_Struct(klass, struct LAO_Surface, &lao_surface_datatype, 0);
 }
 
+#include "include/core/SkCanvas.h"
+#include "include/core/SkGraphics.h"
+#include "include/core/SkPaint.h"
+#include "include/core/SkSurface.h"
+
+#include "include/core/SkStream.h"              // for SkFILEWStream
+#include "include/codec/SkEncodedImageFormat.h" // for SkEncodedImageFormat
+// #include "include/core/SkImageEncoder.h"        // for SkEncodeImage
+
 static VALUE
 t_sfc_initialize(VALUE self, VALUE _width, VALUE _height) {
   DECLARESFC(self);
@@ -83,6 +94,26 @@ t_sfc_initialize(VALUE self, VALUE _width, VALUE _height) {
 
   const int initialize = (width > 0 && height > 0);
 
+  SkGraphics::Init();
+  // SkImageInfo imgi = SkImageInfo::Make(width, height, kBGRA_8888_SkColorType, kUnpremul_SkAlphaType);
+  SkImageInfo imgi = SkImageInfo::MakeN32Premul(512, 256);
+  // sk_sp<SkSurface> sk_sfc = SkSurfaces::Raster(imgi);
+  sk_sp<SkSurface> sk_sfc = SkSurfaces::Null(512, 256);
+
+  SkCanvas* sk_canvas = sk_sfc->getCanvas();
+  SkPaint paint;
+  paint.setColor(SK_ColorBLUE);
+  paint.setAntiAlias(true);
+  sk_canvas->drawCircle(128, 128, 100, paint);
+
+  // sk_sp<SkImage> img = sk_sfc->makeImageSnapshot();
+  // SkPixmap pixmap;
+  // if (img->peekPixels(&pixmap)) {
+  //     SkFILEWStream out("circle.png");
+  //     SkEncodeImage(&out, pixmap, SkEncodedImageFormat::kPNG, 100);
+  // }
+
+
   // SDL_Surface *sfc = SDL_CreateRGBSurfaceWithFormat(0,
   //   512, 512, 32, SDL_PIXELFORMAT_BGRA32);
 
@@ -141,6 +172,7 @@ t_sfc_save_png(VALUE self, VALUE file_name) {
   return Qtrue;
 }
 
+extern "C"
 VALUE
 lao_sfc_create_borrowed(SDL_Surface *sdl_surface, cairo_surface_t *cairo_surface, cairo_t *cairo_ctx) {
   VALUE sfc_obj = t_sfc_allocator(cLayerSurface);
@@ -380,7 +412,7 @@ t_sfc_to_rgb24(VALUE self) {
 
   const unsigned int width = cairo_image_surface_get_width(sfc->cairo_surface);
   const unsigned int height = cairo_image_surface_get_height(sfc->cairo_surface);
-  unsigned char *dest_data = malloc(width * height * 3);
+  unsigned char *dest_data = (unsigned char*)malloc(width * height * 3);
 
   for (unsigned int y = 0; y < height; ++y) {
     for (unsigned int x = 0; x < width; ++x) {
@@ -532,6 +564,7 @@ t_sfc_identity(VALUE self) {
 
 ////////////////////////////////////////////////////////////////////////
 
+extern "C"
 void
 LAO_Surface_Init() {
   cLayerSurface = rb_define_class_under(cLayer, "Surface", rb_cObject);

ext/surface.h

@@ -14,8 +14,16 @@ struct LAO_Surface {
   int borrowed;
 };
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 VALUE lao_sfc_create_borrowed(SDL_Surface *sdl_surface, cairo_surface_t *cairo_surface, cairo_t *cairo_ctx);
 
 struct LAO_Surface *lao_sfc_from_value(VALUE v);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif