try calling freetype

Author: mikerreed

skia/viewer/build/premake5.lua

@@ -19,17 +19,24 @@ includedirs {"../include", "../../../include", "../../renderer/include", "../../
              "../../dependencies/skia", "../../dependencies/skia/include/core",
              "../../dependencies/skia/include/effects", "../../dependencies/skia/include/gpu",
              "../../dependencies/skia/include/config", "../../dependencies/imgui", "../../dependencies",
-             "../../dependencies/gl3w/build/include"}
+             "../../dependencies/gl3w/build/include",
+             "/Users/mike/other/freetype/include"
+}
 
-links {"Cocoa.framework", "IOKit.framework", "CoreVideo.framework", "rive", "skia", "rive_skia_renderer", "glfw3"}
+links {
+    "Cocoa.framework", "IOKit.framework", "CoreVideo.framework",
+    "rive", "skia", "rive_skia_renderer", "glfw3",
+    "freetype",
+}
 libdirs {"../../../build/%{cfg.system}/bin/%{cfg.buildcfg}", "../../dependencies/glfw_build/src",
-         "../../dependencies/skia/out/static", "../../renderer/build/%{cfg.system}/bin/%{cfg.buildcfg}"}
+         "../../dependencies/skia/out/static", "../../renderer/build/%{cfg.system}/bin/%{cfg.buildcfg}",}
 
 files {"../src/**.cpp", "../../dependencies/gl3w/build/src/gl3w.c",
        "../../dependencies/imgui/backends/imgui_impl_glfw.cpp",
        "../../dependencies/imgui/backends/imgui_impl_opengl3.cpp", "../../dependencies/imgui/imgui_widgets.cpp",
        "../../dependencies/imgui/imgui.cpp", "../../dependencies/imgui/imgui_tables.cpp",
-       "../../dependencies/imgui/imgui_draw.cpp"}
+       "../../dependencies/imgui/imgui_draw.cpp",
+    }
 
 buildoptions {"-Wall", "-fno-exceptions", "-fno-rtti", "-flto=full"}
 filter "configurations:debug"

skia/viewer/src/fonts.cpp

@@ -0,0 +1,102 @@
+#include "rive/renderer.hpp"
+#include "SkData.h"
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+
+#include <freetype/ftadvanc.h>
+#include <freetype/ftimage.h>
+#include <freetype/ftbitmap.h>
+#ifdef FT_COLOR_H  // 2.10.0
+#   include <freetype/ftcolor.h>
+#endif
+#include <freetype/freetype.h>
+#include <freetype/ftlcdfil.h>
+#include <freetype/ftmodapi.h>
+#include <freetype/ftmm.h>
+#include <freetype/ftoutln.h>
+#include <freetype/ftsizes.h>
+#include <freetype/ftsystem.h>
+#include <freetype/tttables.h>
+#include <freetype/t1tables.h>
+#include <freetype/ftfntfmt.h>
+
+
+
+
+typedef struct FT_LibraryRec_* FT_Library;
+typedef struct FT_FaceRec_* FT_Face;
+typedef struct FT_StreamRec_* FT_Stream;
+typedef signed long FT_Pos;
+typedef struct FT_BBox_ FT_BBox;
+
+
+
+struct FTLib {
+    FT_Library m_Lib;
+
+    FTLib() : m_Lib(nullptr) {
+        int err = FT_Init_FreeType(&m_Lib);
+        if (err) {
+            printf("FT_Init_FreeType returned %d\n", err);
+            return;
+        }
+
+        FT_Add_Default_Modules(m_Lib);
+        FT_Set_Default_Properties(m_Lib);
+    }
+    ~FTLib() {
+        if (m_Lib) {
+            FT_Done_Library(m_Lib);
+        }
+    }
+    
+    operator bool() const { return m_Lib != nullptr; }
+};
+
+struct FTFace {
+    sk_sp<SkData> m_Data;
+    FT_Face m_Face;
+    
+    FTFace() : m_Face(nullptr) {}
+    ~FTFace() {
+        if (m_Face) {
+            FT_Done_Face(m_Face);
+        }
+    }
+
+    bool load(FT_Library lib, sk_sp<SkData> data) {
+        int face_index = 0; // todo
+        int err = FT_New_Memory_Face(lib, (const FT_Byte*)data->data(),
+                                     data->size(), face_index, &m_Face);
+        if (err) {
+            printf("FT_New_Memory_Face returned %d\n", err);
+            return false;
+        }
+        m_Data = std::move(data);
+        return true;
+    }
+};
+
+void test_fonts(const char path[]) {
+    FTLib lib;
+    if (!lib) {
+        printf("failed to init freetype\n");
+        return;
+    }
+    
+    auto data = SkData::MakeFromFileName(path);
+    if (!data) {
+        printf("failed to load file %s\n", path);
+        return;
+    }
+
+    FTFace face;
+    if (!face.load(lib.m_Lib, data)) {
+        printf("failed to load file\n");
+        return;
+    }
+    
+    printf("%s has %ld glyphs and %d upem\n",
+           path, face.m_Face->num_glyphs, face.m_Face->units_per_EM);
+}

skia/viewer/src/main.cpp

@@ -132,8 +132,12 @@ void glfwDropCallback(GLFWwindow* window, int count, const char** paths) {
     initAnimation(0);
 }
 
+void test_fonts(const char path[]);
+
 int main() {
-    if (!glfwInit()) {
+    test_fonts("/Users/mike/fonts/Skia.ttf");
+
+        if (!glfwInit()) {
         fprintf(stderr, "Failed to initialize glfw.\n");
         return 1;
     }
@@ -373,4 +377,4 @@ int main() {
     glfwTerminate();
 
     return 0;
-}
+}