Use stb_image instead of libpng

CMakeLists.txt

@@ -9,25 +9,34 @@ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 # Enable Package Managers
 include(cmake/CPM.cmake)
 
+CPMAddPackage(
+        NAME stb_image
+        URL https://git.redacted.cc/Redacted/stb_image/archive/Release-1.zip
+)
+
 set(CMAKE_CXX_STANDARD 20)
 
 file(GLOB_RECURSE HEADERS "include/*.h")
 file(GLOB_RECURSE SOURCES "src/*.cpp")
 file(COPY "testImages" DESTINATION "${PROJECT_BINARY_DIR}")
 
-find_package(PNG REQUIRED)
-
-include_directories("include" "/usr/include/libpng16")
-
 if (PROJECT_SOURCE_DIR STREQUAL PROJECT_BINARY_DIR)
     message(FATAL_ERROR "In-Source builds are not allowed")
 endif()
 
-add_library(ReTexture SHARED ${SOURCES} ${HEADERS})
+if (UNIX AND NOT APPLE)
+    add_library(ReTexture SHARED ${SOURCES} ${HEADERS})
+endif()
+
+if (WIN32)
+    add_library(ReTexture STATIC ${SOURCES} ${HEADERS})
+endif()
+
+target_include_directories(ReTexture PRIVATE ${stb_image_SOURCE_DIR}/include)
+target_include_directories(ReTexture PUBLIC ${PROJECT_SOURCE_DIR}/include)
 add_executable(ReTextureTest main.cpp)
 
 set_target_properties(ReTexture PROPERTIES LINKER_LANGUAGE CXX)
 set_target_properties(ReTextureTest PROPERTIES LINKER_LANGUAGE CXX)
-
-target_link_libraries(ReTexture PUBLIC PNG::PNG)
+target_link_libraries(ReTexture PUBLIC stb_image)
 target_link_libraries(ReTextureTest PUBLIC ReTexture)

include/ReTexture/rTexture.h

@@ -3,7 +3,6 @@
 #include <vector>
 #include <string>
 #include <ReTexture/flags.h>
-#include <png.h>
 
 class RTexture {
 private:
@@ -17,4 +16,5 @@ public:
     RTextureFormat format;
     std::vector<unsigned char> pixelData;
     RTexture(const std::string& file, const std::vector<RTextureFlag>& args);
+    explicit RTexture(const std::string& file);
 };

src/rTexture.cpp

@@ -1,7 +1,10 @@
 #include <fstream>
 #include <algorithm>
 #include <ReTexture/rTexture.h>
-#include <iostream>
+
+#define STB_IMAGE_IMPLEMENTATION
+#include <stb_image.h>
+
 void RTexture::load(const std::string& file) {
     std::ifstream ifStream(file, std::ios::in | std::ios::binary);
     unsigned char bmpFileHeader[14];
@@ -49,75 +52,23 @@ void RTexture::loadBMP(const std::string& file) {
 }
 
 void RTexture::loadPNG(const std::string &file) {
-    FILE *fp = fopen(file.c_str(), "rb");
-    if (!fp) {
-        fprintf(stderr, "Could not open file %s for reading\n", file.c_str());
+    int channels, w, h;
+
+    unsigned char *imageData = stbi_load(file.c_str(), &w, &h, &channels, 0);
+
+    if (imageData == nullptr)
         return;
-    }
+    
+    width = w;
+    height = h;
+    if (channels == 3)
+        format = RTextureFormat::RGB;
 
-    png_structp png = png_create_read_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
-    if (!png) {
-        fprintf(stderr, "Could not create png read struct\n");
-        fclose(fp);
-        return;
-    }
-
-    png_infop info = png_create_info_struct(png);
-    if (!info) {
-        fprintf(stderr, "Could not create png info struct\n");
-        png_destroy_read_struct(&png, nullptr, nullptr);
-        fclose(fp);
-        return;
-    }
-
-    if (setjmp(png_jmpbuf(png))) {
-        fprintf(stderr, "Error during png creation\n");
-        png_destroy_read_struct(&png, &info, nullptr);
-        fclose(fp);
-        return;
-    }
-
-    png_init_io(png, fp);
-    png_read_info(png, info);
-
-    width = png_get_image_width(png, info);
-    height = png_get_image_height(png, info);
-    png_byte color_type = png_get_color_type(png, info);
-    png_byte bit_depth = png_get_bit_depth(png, info);
-
-    if (bit_depth == 16)
-        png_set_strip_16(png);
-
-    if (color_type == PNG_COLOR_TYPE_PALETTE)
-        png_set_palette_to_rgb(png);
-
-    if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
-        png_set_expand_gray_1_2_4_to_8(png);
-
-    if (png_get_valid(png, info, PNG_INFO_tRNS))
-        png_set_tRNS_to_alpha(png);
-
-    if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
-        png_set_gray_to_rgb(png);
-
-    png_read_update_info(png, info);
-
-    pixelData.resize(png_get_rowbytes(png, info) * height);
-    std::vector<png_bytep> row_pointers(height);
-
-    for (unsigned y = 0; y < height; ++y) {
-        row_pointers[y] = pixelData.data() + y * png_get_rowbytes(png, info);
-    }
-
-    png_read_image(png, row_pointers.data());
-
-    fclose(fp);
-    png_destroy_read_struct(&png, &info, nullptr);
-    if (color_type & PNG_COLOR_MASK_ALPHA)
+    if (channels == 4)
         format = RTextureFormat::RGBA;
 
-    if (!(color_type & PNG_COLOR_MASK_ALPHA))
-        format = RTextureFormat::RGB;
+    pixelData.assign(imageData, imageData + width * height * channels);
+    stbi_image_free(imageData);
 }
 
 RTexture::RTexture(const std::string &file, const std::vector<RTextureFlag> &args) {
@@ -142,3 +93,7 @@ void RTexture::invertY() {
         std::copy(temp.begin(), temp.end(), topRow);
     }
 }
+
+RTexture::RTexture(const std::string& file) {
+    *this = RTexture(file, {});
+}