add Bitmap.to_file

README.md

@@ -150,6 +150,7 @@ To smooth over cross-platform compatibility, functionality that you won't find i
 ### Bitmap
 
 * The `Bitmap` class has one additional property: `raw_data` gets and sets the raw pixel data of a Bitmap in the form of a string. The string must be the size of the bitmap's `width*height*4`. If it is not, no error is raised, but the Bitmap will not be updated.
+* The `Bitmap` class has one additional function: `to_file(path)` will save the bitmap to `path` in BMP format. This won't take opacity into account.
 
 ### Audio
 

binding/bitmap-binding.cpp

@@ -445,6 +445,25 @@ RB_METHOD(bitmapSetRawData)
     return self;
 }
 
+RB_METHOD(bitmapSaveToFile)
+{
+    RB_UNUSED_PARAM;
+    
+    VALUE str;
+    rb_scan_args(argc, argv, "1", &str);
+    SafeStringValue(str);
+    
+    Bitmap *b = getPrivateData<Bitmap>(self);
+    
+    try {
+        b->saveToFile(RSTRING_PTR(str));
+    } catch (const Exception &e) {
+        raiseRbExc(e);
+    }
+    
+    return RUBY_Qnil;
+}
+
 RB_METHOD(bitmapInitializeCopy)
 {
 	rb_check_argc(argc, 1);
@@ -496,6 +515,7 @@ bitmapBindingInit()
     
     _rb_define_method(klass, "raw_data",    bitmapGetRawData);
     _rb_define_method(klass, "raw_data=",   bitmapSetRawData);
+    _rb_define_method(klass, "to_file",     bitmapSaveToFile);
 
 	_rb_define_method(klass, "gradient_fill_rect", bitmapGradientFillRect);
 	_rb_define_method(klass, "clear_rect",         bitmapClearRect);

src/bitmap.cpp

@@ -883,9 +883,9 @@ void Bitmap::setPixel(int x, int y, const Color &color)
 	p->onModified(false);
 }
 
-void Bitmap::getRaw(void *output, int output_size)
+bool Bitmap::getRaw(void *output, int output_size)
 {
-    if (output_size != width()*height()*4) return;
+    if (output_size != width()*height()*4) return false;
     
     guardDisposed();
     
@@ -893,6 +893,7 @@ void Bitmap::getRaw(void *output, int output_size)
     
     FBO::bind(p->gl.fbo);
     glReadPixels(0,0,width(),height(),GL_BGRA,GL_UNSIGNED_BYTE,output);
+    return true;
 }
 
 void Bitmap::replaceRaw(void *pixel_data, int size)
@@ -919,6 +920,27 @@ void Bitmap::replaceRaw(void *pixel_data, int size)
     p->onModified();
 }
 
+void Bitmap::saveToFile(const char *filename)
+{
+    guardDisposed();
+    
+    GUARD_MEGA;
+    
+    SDL_Surface *surf = SDL_CreateRGBSurface(0, width(), height(),p->format->BitsPerPixel, 0,0,0,0);
+    
+    if (!surf)
+        throw new Exception(Exception::SDLError, "Failed to save bitmap: %s", SDL_GetError());
+    
+    getRaw(surf->pixels, surf->w * surf->h * 4);
+    
+    char *fn_normalized = shState->fileSystem().normalize(filename, 1, 1);
+    int rc = SDL_SaveBMP(surf, fn_normalized);
+    
+    SDL_FreeSurface(surf);
+    delete fn_normalized;
+    if (rc) throw new Exception(Exception::SDLError, "%s", SDL_GetError());
+}
+
 void Bitmap::hueChange(int hue)
 {
 	guardDisposed();

src/bitmap.h

@@ -82,8 +82,9 @@ public:
 	Color getPixel(int x, int y) const;
 	void setPixel(int x, int y, const Color &color);
     
-    void getRaw(void *output, int output_size);
+    bool getRaw(void *output, int output_size);
     void replaceRaw(void *pixel_data, int size);
+    void saveToFile(const char *filename);
 
 	void hueChange(int hue);
 

src/graphics.cpp

@@ -984,9 +984,8 @@ void Graphics::screenshot(const char *filename)
     
 #ifdef __WIN32__
     SDL_Surface *img = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 32, 0,0,0,0);
-    if (!img) throw Exception(Exception::SDLError, "%s", SDL_GetError());
+    if (!img) throw new Exception(Exception::SDLError, "%s", SDL_GetError());
     
-    glReadBuffer(GL_FRONT);
     glReadPixels(0,0,w,h,GL_BGRA,GL_UNSIGNED_BYTE, img->pixels);
 #else
     SDL_Surface *tmp, *img;
@@ -999,7 +998,6 @@ void Graphics::screenshot(const char *filename)
         throw Exception(Exception::SDLError, "%s", SDL_GetError());
     }
     
-    glReadBuffer(GL_FRONT);
     glReadPixels(0,0,w,h,GL_BGRA,GL_UNSIGNED_BYTE, tmp->pixels);
     
     for (int i = 0; i < h; i++)
@@ -1016,7 +1014,7 @@ void Graphics::screenshot(const char *filename)
     
     SDL_FreeSurface(img);
     delete fn_normalized;
-	if (rc) throw Exception(Exception::SDLError, "%s", SDL_GetError());
+	if (rc) throw new Exception(Exception::SDLError, "%s", SDL_GetError());
 }
 
 DEF_ATTR_RD_SIMPLE(Graphics, Brightness, int, p->brightness)