src/sdl/sdlpixbuffactory.cpp

   1 /*
   2  * Copyright (c) 2007-2013, Czirkos Zoltan http://code.google.com/p/gdash/
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining
   5  * a copy of this software and associated documentation files (the
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sublicense, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  18  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
  19  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
  20  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  21  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #include "config.h"
  25
  26 #include <stdexcept>
  27 #include <SDL.h>
  28 #include <SDL_image.h>
  29 #include <glib.h>
  30
  31 #include "sdl/sdlpixbuffactory.hpp"
  32 #include "sdl/sdlpixbuf.hpp"
  33 #include "sdl/sdlscreen.hpp"
  34 #include "cave/colors.hpp"
  35
  36
  37
  38 Pixbuf *SDLPixbufFactory::create_from_file(const char *filename) const {
  39     SDL_Surface *surface = IMG_Load(filename);
  40     if (!surface)       // if could not load
  41         throw std::runtime_error(std::string("cannot load image ") + IMG_GetError());
  42     return new SDLPixbuf(surface);
  43 }
  44
  45
  46 Pixbuf *SDLPixbufFactory::create_from_inline(int length, unsigned char const *data) const {
  47     SDL_RWops *rwop = SDL_RWFromConstMem(data, length);
  48     SDL_Surface *surface = IMG_Load_RW(rwop, 1);  // 1 = automatically closes rwop
  49     if (!surface)       // if could not load
  50         throw std::runtime_error(std::string("cannot load image ") + IMG_GetError());
  51     return new SDLPixbuf(surface);
  52 }
  53
  54
  55 Pixbuf *SDLPixbufFactory::create(int w, int h) const {
  56     return new SDLPixbuf(w, h);
  57 }
  58
  59
  60 Pixbuf *SDLPixbufFactory::create_composite_color(Pixbuf const &src, const GdColor &c, unsigned char a) const {
  61     SDLPixbuf const &srcsdl = static_cast<SDLPixbuf const &>(src);
  62     SDL_Surface *rect = SDL_CreateRGBSurface(0, srcsdl.get_surface()->w, srcsdl.get_surface()->h, 32, srcsdl.rmask, srcsdl.gmask, srcsdl.bmask, 0); /* no amask, as we set overall alpha! */
  63     if (!rect)
  64         throw std::runtime_error(std::string("could not create surface: ") + SDL_GetError());
  65     unsigned char r, g, b;
  66     c.get_rgb(r, g, b);
  67     SDL_FillRect(rect, NULL, SDL_MapRGB(rect->format, r, g, b));
  68     SDL_SetAlpha(rect, SDL_SRCALPHA, a);
  69
  70     SDL_Surface *ret = SDL_CreateRGBSurface(0, srcsdl.get_surface()->w, srcsdl.get_surface()->h, 32, srcsdl.rmask, srcsdl.gmask, srcsdl.bmask, srcsdl.amask);
  71     if (!ret)
  72         throw std::runtime_error(std::string("could not create surface: ") + SDL_GetError());
  73     SDL_SetAlpha(srcsdl.get_surface(), 0, 255);
  74     SDL_BlitSurface(srcsdl.get_surface(), NULL, ret, NULL);
  75     SDL_BlitSurface(rect, NULL, ret, NULL);
  76     SDL_FreeSurface(rect);
  77     return new SDLPixbuf(ret);
  78 }
  79
  80
  81 Pixbuf *SDLPixbufFactory::create_subpixbuf(Pixbuf &src, int x, int y, int w, int h) const {
  82     g_assert(x >= 0 && y >= 0 && x + w <= src.get_width() && y + h <= src.get_height());
  83     SDL_Surface *sub = SDL_CreateRGBSurfaceFrom(&src(x, y), w, h, 32, src.get_pitch(), src.rmask, src.gmask, src.bmask, src.amask);
  84     return new SDLPixbuf(sub);
  85 }