[studio,turbine] Add support for window icons

src/olympic/studio/applib/src/app.cpp

@@ -32,11 +32,15 @@ static void keyEventHandler(turbine::Context &ctx, turbine::Key key, bool down)
 	sctx->ui.handleKeyEvent(key, down);
 }
 
+[[nodiscard]]
+ox::SpanView<uint8_t> WindowIcon() noexcept;
+
 static ox::Error runApp(
 		ox::StringViewCR appName,
 		ox::StringViewCR projectDataDir,
 		ox::UPtr<ox::FileSystem> &&fs) noexcept {
 	OX_REQUIRE_M(ctx, turbine::init(std::move(fs), appName));
+	oxLogError(turbine::setWindowIcon(*ctx, WindowIcon()));
 	turbine::setWindowTitle(*ctx, keelCtx(*ctx).appName);
 	turbine::setKeyEventHandler(*ctx, keyEventHandler);
 	turbine::setRefreshWithin(*ctx, 0);

src/olympic/turbine/include/turbine/gfx.hpp

@@ -26,6 +26,8 @@ void removeDrawer(Context &ctx, Drawer *cd) noexcept;
 
 ox::Error initGfx(Context &ctx) noexcept;
 
+ox::Error setWindowIcon(Context &ctx, ox::SpanView<uint8_t> iconPng) noexcept;
+
 void setWindowTitle(Context &ctx, ox::StringViewCR title) noexcept;
 
 void focusWindow(Context &ctx) noexcept;

src/olympic/turbine/src/glfw/CMakeLists.txt

@@ -21,4 +21,5 @@ target_link_libraries(
 		glad
 		glfw
 		imgui
+		lodepng
 )

src/olympic/turbine/src/glfw/gfx.cpp

@@ -4,6 +4,7 @@
 
 #include <glad/glad.h>
 #include <GLFW/glfw3.h>
+#include <lodepng.h>
 #if TURBINE_USE_IMGUI
 #include <imgui_impl_glfw.h>
 #include <imgui_impl_opengl3.h>
@@ -228,6 +229,34 @@ ox::Error initGfx(Context &ctx) noexcept {
 	return {};
 }
 
+struct IconData {
+	std::vector<uint8_t> pixels;
+	int w{}, h{};
+};
+
+[[nodiscard]]
+static ox::Result<IconData> toGlfwImgPixels(ox::SpanView<uint8_t> iconPng) noexcept {
+	ox::Result<IconData> out;
+	unsigned w{}, h{};
+	if (lodepng::decode(out.value.pixels, w, h, iconPng.data(), LodePNGColorType::LCT_RGBA)) {
+		return ox::Error{1, "unable to decode window icon PNG data"};
+	}
+	out.value.w = static_cast<int>(w);
+	out.value.h = static_cast<int>(h);
+	return out;
+}
+
+ox::Error setWindowIcon(Context &ctx, ox::SpanView<uint8_t> iconPng) noexcept {
+	OX_REQUIRE_M(icon, toGlfwImgPixels(iconPng));
+	GLFWimage const img {
+		.pixels = icon.pixels.data(),
+		.width = icon.w,
+		.height = icon.h,
+	};
+	glfwSetWindowIcon(ctx.window, 1, &img);
+	return {};
+}
+
 void setWindowTitle(Context &ctx, ox::StringViewCR title) noexcept {
 	auto cstr = ox_malloca(title.bytes() + 1, char);
 	ox::strncpy(cstr.get(), title.data(), title.bytes());