cmake: prefer system stb headers

.reuse/dep5

@@ -147,3 +147,7 @@ License: GPL-3.0-or-later
 Files: src/android/gradle/wrapper/*
 Copyright: 2023 yuzu Emulator Project
 License: GPL-3.0-or-later
+
+Files: externals/stb/*
+Copyright: Sean Barrett
+License: MIT

CMakeLists.txt

@@ -294,6 +294,7 @@ find_package(lz4 REQUIRED)
 find_package(nlohmann_json 3.8 REQUIRED)
 find_package(Opus 1.3 MODULE)
 find_package(RenderDoc MODULE)
+find_package(stb MODULE)
 find_package(VulkanMemoryAllocator CONFIG)
 find_package(ZLIB 1.2 REQUIRED)
 find_package(zstd 1.5 REQUIRED)

CMakeModules/Findstb.cmake

+# SPDX-FileCopyrightText: 2023 Alexandre Bouvier <contact@amb.tf>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+find_path(stb_image_INCLUDE_DIR stb_image.h PATH_SUFFIXES stb)
+find_path(stb_image_resize_INCLUDE_DIR stb_image_resize.h PATH_SUFFIXES stb)
+find_path(stb_image_write_INCLUDE_DIR stb_image_write.h PATH_SUFFIXES stb)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(stb
+    REQUIRED_VARS
+        stb_image_INCLUDE_DIR
+        stb_image_resize_INCLUDE_DIR
+        stb_image_write_INCLUDE_DIR
+)
+
+if (stb_FOUND AND NOT TARGET stb::headers)
+    add_library(stb::headers INTERFACE IMPORTED)
+    set_property(TARGET stb::headers PROPERTY
+        INTERFACE_INCLUDE_DIRECTORIES
+            "${stb_image_INCLUDE_DIR}"
+            "${stb_image_resize_INCLUDE_DIR}"
+            "${stb_image_write_INCLUDE_DIR}"
+    )
+endif()
+
+mark_as_advanced(
+    stb_image_INCLUDE_DIR
+    stb_image_resize_INCLUDE_DIR
+    stb_image_write_INCLUDE_DIR
+)

externals/CMakeLists.txt

@@ -168,9 +168,13 @@ if (NOT TARGET LLVM::Demangle)
     add_library(LLVM::Demangle ALIAS demangle)
 endif()
 
-add_library(stb stb/stb_dxt.cpp stb/stb_image.cpp stb/stb_image_resize.cpp stb/stb_image_write.cpp)
+add_library(stb stb/stb_dxt.cpp)
 target_include_directories(stb PUBLIC ./stb)
 
+if (NOT TARGET stb::headers)
+    add_library(stb::headers ALIAS stb)
+endif()
+
 add_library(bc_decoder bc_decoder/bc_decoder.cpp)
 target_include_directories(bc_decoder PUBLIC ./bc_decoder)
 

src/common/CMakeLists.txt

@@ -120,6 +120,8 @@ add_library(common STATIC
     socket_types.h
     spin_lock.cpp
     spin_lock.h
+    stb.cpp
+    stb.h
     steady_clock.cpp
     steady_clock.h
     stream.cpp
@@ -208,6 +210,8 @@ if (MSVC)
     /we4254 # 'operator': conversion from 'type1:field_bits' to 'type2:field_bits', possible loss of data
     /we4800 # Implicit conversion from 'type' to bool. Possible information loss
   )
+else()
+  set_source_files_properties(stb.cpp PROPERTIES COMPILE_OPTIONS "-Wno-implicit-fallthrough;-Wno-missing-declarations;-Wno-missing-field-initializers")
 endif()
 
 if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
@@ -223,7 +227,7 @@ endif()
 
 create_target_directory_groups(common)
 
-target_link_libraries(common PUBLIC Boost::context Boost::headers fmt::fmt microprofile Threads::Threads)
+target_link_libraries(common PUBLIC Boost::context Boost::headers fmt::fmt microprofile stb::headers Threads::Threads)
 target_link_libraries(common PRIVATE lz4::lz4 zstd::zstd LLVM::Demangle)
 
 if (ANDROID)

src/common/stb.cpp

+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#define STB_IMAGE_IMPLEMENTATION
+#define STB_IMAGE_RESIZE_IMPLEMENTATION
+#define STB_IMAGE_WRITE_IMPLEMENTATION
+
+#include "common/stb.h"

src/common/stb.h

+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <stb_image.h>
+#include <stb_image_resize.h>
+#include <stb_image_write.h>

src/core/hle/service/caps/caps_manager.cpp

@@ -2,13 +2,11 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <sstream>
-#include <stb_image.h>
-#include <stb_image_resize.h>
-#include <stb_image_write.h>
 
 #include "common/fs/file.h"
 #include "common/fs/path_util.h"
 #include "common/logging/log.h"
+#include "common/stb.h"
 #include "core/core.h"
 #include "core/hle/service/caps/caps_manager.h"
 #include "core/hle/service/caps/caps_result.h"
@@ -409,6 +407,12 @@ Result AlbumManager::LoadImage(std::span<u8> out_image, const std::filesystem::p
     return ResultSuccess;
 }
 
+static void PNGToMemory(void* context, void* png, int len) {
+    std::vector<u8>* png_image = static_cast<std::vector<u8>*>(context);
+    png_image->reserve(len);
+    std::memcpy(png_image->data(), png, len);
+}
+
 Result AlbumManager::SaveImage(ApplicationAlbumEntry& out_entry, std::span<const u8> image,
                                u64 title_id, const AlbumFileDateTime& date) const {
     const auto screenshot_path =
@@ -422,16 +426,12 @@ Result AlbumManager::SaveImage(ApplicationAlbumEntry& out_entry, std::span<const
     const Common::FS::IOFile db_file{file_path, Common::FS::FileAccessMode::Write,
                                      Common::FS::FileType::BinaryFile};
 
-    s32 len;
-    const u8* png = stbi_write_png_to_mem(image.data(), 0, 1280, 720, STBI_rgb_alpha, &len);
-
-    if (!png) {
+    std::vector<u8> png_image;
+    if (!stbi_write_png_to_func(PNGToMemory, &png_image, 1280, 720, STBI_rgb_alpha, image.data(),
+                                0)) {
         return ResultFileCountLimit;
     }
 
-    std::vector<u8> png_image(len);
-    std::memcpy(png_image.data(), png, len);
-
     if (db_file.Write(png_image) != png_image.size()) {
         return ResultFileCountLimit;
     }