texture: abstract get pixel color method into drawutils

src/DrawUtils.cpp

@@ -154,6 +154,16 @@ void CST_MixerInit(RootDisplay* root)
 #endif
 }
 
+
+void CST_GetRGBA(Uint32 pixel, SDL_PixelFormat* format, CST_Color* cstColor)
+{
+#ifndef SDL1
+	SDL_GetRGBA(pixel, format, &cstColor->r, &cstColor->g, &cstColor->b, &cstColor->a);
+#else
+	SDL_GetRGB(pixel, format, &cstColor->r, &cstColor->g, &cstColor->b);
+#endif
+}
+
 // https://stackoverflow.com/a/51238719/4953343
 bool CST_SavePNG(CST_Texture* texture, const char* file_name)
 {

src/DrawUtils.hpp

@@ -83,6 +83,7 @@ void CST_Delay(int time);
 int CST_GetTicks();
 bool CST_isRectOffscreen(CST_Rect* rect);
 
+void CST_GetRGBA(Uint32 pixel, SDL_PixelFormat* format, CST_Color* cstColor);
 bool CST_SavePNG(CST_Texture* texture, const char* filename);
 void CST_SetWindowTitle(const char* title);
 

src/Texture.cpp

@@ -62,7 +62,7 @@ bool Texture::loadFromSurface(CST_Surface *surface)
 
 	// load first pixel color
 	auto pixelcolor = getpixel(surface, 0, 0);
-	SDL_GetRGBA(pixelcolor, surface->format, &texFirstPixel.r, &texFirstPixel.g, &texFirstPixel.b, &texFirstPixel.a);
+	CST_GetRGBA(pixelcolor, surface->format, &texFirstPixel);
 
 	// load texture size
 	CST_QueryTexture(texture, &texW, &texH);
@@ -134,11 +134,13 @@ void Texture::render(Element* parent)
 
 		// draw colored background
 		CST_SetDrawColor(renderer, texFirstPixel);
-		auto color = (CST_Color){texFirstPixel.r,texFirstPixel.g,texFirstPixel.b,0xFF};
+		auto color = (CST_Color){texFirstPixel.r, texFirstPixel.g, texFirstPixel.b, 0xFF};
 
 		// if the first pixel is transparent, use white
+#ifndef SDL1
 		if (texFirstPixel.a == 0)
 			color = (CST_Color){0xFF,0xFF,0xFF,0xFF};
+#endif
 
 		CST_SetDrawColor(renderer, color);
 		CST_FillRect(renderer, &rect);