add dark theme

luigi/backend/ffisdl/font.lua

@@ -210,9 +210,7 @@ function Font:constructor (path, size)
         local font = SDL2_ttf.TTF_OpenFont(path, size)
 
         if font == nil then
-            io.stderr:write(ffi.string(sdl.getError()))
-            sdl.quit()
-            os.exit(1)
+            error(ffi.string(sdl.getError()))
         end
 
         fontCache[key] = font

luigi/backend/ffisdl/image.lua

@@ -17,9 +17,19 @@ function Image:constructor (renderer, path)
     self.sdlSurface = ffi.gc(
         SDL2_image.IMG_Load(path),
         sdl.freeSurface)
+
+    if self.sdlSurface == nil then
+        error(ffi.string(sdl.getError()))
+    end
+
     self.sdlTexture = ffi.gc(
         sdl.createTextureFromSurface(renderer, self.sdlSurface),
         sdl.destroyTexture)
+
+    if self.sdlTexture == nil then
+        error(ffi.string(sdl.getError()))
+    end
+
     self.width = self.sdlSurface.w
     self.height = self.sdlSurface.h
 end

luigi/backend/ffisdl/sdl.lua

@@ -60,8 +60,7 @@ sdl.atomic_t = ffi.typeof 'SDL_atomic_t'
 sdl.version = ffi.typeof 'SDL_version'
 
 if sdl.init(sdl.INIT_VIDEO) ~= 0 then
-    io.stderr:write(ffi.string(sdl.getError()))
-    os.exit(1)
+    error(ffi.string(sdl.getError()))
 end
 
 return sdl

luigi/backend/ffisdl/text.lua

@@ -38,14 +38,19 @@ local function renderMulti (self, font, text, color, align, limit)
 
     local r, g, b, a
 
+    --[[
     if sdl.BYTEORDER == sdl.BIG_ENDIAN then
         r, g, b, a = 0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF
     else
         r, g, b, a = 0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000
     end
+    --]]
+
+    -- values from SDL_ttf.c
+    r, g, b, a = 0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000
 
     local surface = ffi.gc(
-        sdl.createRGBSurface(0, limit, height, 32, r, g, b, a),
+        sdl.createRGBSurface(sdl.SWSURFACE, limit, height, 32, r, g, b, a),
         sdl.freeSurface)
     self.sdlSurface = surface
 
@@ -55,6 +60,8 @@ local function renderMulti (self, font, text, color, align, limit)
             ttf.TTF_RenderUTF8_Blended(font.sdlFont, text, color),
             sdl.freeSurface)
         if lineSurface ~= nil then
+            sdl.setSurfaceBlendMode(lineSurface, sdl.BLENDMODE_NONE)
+            
             local w, h = lineSurface.w, lineSurface.h
             local top = (index - 1) * lineHeight