source: libpipi/trunk/pipi/codec/sdl.c

Last change on this file was 3342, checked in by Sam Hocevar, 11 years ago

Change _C pixel format suffixes into _U8 for more clarity.

File size: 3.3 KB
Line 
1/*
2 *  libpipi       Pathetic image processing interface library
3 *  Copyright (c) 2004-2008 Sam Hocevar <sam@zoy.org>
4 *                All Rights Reserved
5 *
6 *  $Id$
7 *
8 *  This library is free software. It comes without any warranty, to
9 *  the extent permitted by applicable law. You can redistribute it
10 *  and/or modify it under the terms of the Do What The Fuck You Want
11 *  To Public License, Version 2, as published by Sam Hocevar. See
12 *  http://sam.zoy.org/wtfpl/COPYING for more details.
13 */
14
15/*
16 * sdl.c: SDL_image I/O functions
17 */
18
19#include "config.h"
20
21#include <stdio.h>
22#include <stdlib.h>
23#include <string.h>
24
25#include <SDL_image.h>
26
27#include "pipi.h"
28#include "pipi_internals.h"
29
30static int pipi_free_sdl(pipi_image_t *);
31static SDL_Surface *create_32bpp_surface(int w, int h);
32
33pipi_image_t *pipi_load_sdl(const char *name)
34{
35    pipi_image_t *img;
36    SDL_Surface *priv = IMG_Load(name);
37
38    if(!priv)
39        return NULL;
40
41    if(priv->format->BytesPerPixel != 4)
42    {
43        SDL_Surface *tmp = create_32bpp_surface(priv->w, priv->h);
44        SDL_BlitSurface(priv, NULL, tmp, NULL);
45        SDL_FreeSurface(priv);
46        priv = tmp;
47    }
48
49    img = pipi_new(priv->w, priv->h);
50
51    img->p[PIPI_PIXELS_RGBA_U8].pixels = priv->pixels;
52    img->p[PIPI_PIXELS_RGBA_U8].w = priv->w;
53    img->p[PIPI_PIXELS_RGBA_U8].h = priv->h;
54    img->p[PIPI_PIXELS_RGBA_U8].pitch = priv->pitch;
55    img->p[PIPI_PIXELS_RGBA_U8].bpp = 32;
56    img->p[PIPI_PIXELS_RGBA_U8].bytes = 4 * img->w * img->h;
57    img->last_modified = PIPI_PIXELS_RGBA_U8;
58
59    img->codec_priv = (void *)priv;
60    img->codec_format = PIPI_PIXELS_RGBA_U8;
61    img->codec_free = pipi_free_sdl;
62
63    img->wrap = 0;
64    img->u8 = 1;
65
66    return img;
67}
68
69int pipi_save_sdl(pipi_image_t *img, const char *name)
70{
71    if(!img->codec_priv)
72    {
73        SDL_Surface *priv = create_32bpp_surface(img->w, img->h);
74
75        /* FIXME: check pitch differences here */
76        if(img->last_modified == PIPI_PIXELS_RGBA_U8)
77        {
78            memcpy(priv->pixels, img->p[PIPI_PIXELS_RGBA_U8].pixels,
79                   priv->pitch * priv->h);
80            free(img->p[PIPI_PIXELS_RGBA_U8].pixels);
81        }
82
83        img->p[PIPI_PIXELS_RGBA_U8].pixels = priv->pixels;
84        img->p[PIPI_PIXELS_RGBA_U8].w = priv->w;
85        img->p[PIPI_PIXELS_RGBA_U8].h = priv->h;
86        img->p[PIPI_PIXELS_RGBA_U8].pitch = priv->pitch;
87        img->p[PIPI_PIXELS_RGBA_U8].bpp = 32;
88        img->p[PIPI_PIXELS_RGBA_U8].bytes = 4 * img->w * img->h;
89
90        img->codec_priv = (void *)priv;
91        img->codec_format = PIPI_PIXELS_RGBA_U8;
92        img->codec_free = pipi_free_sdl;
93
94        img->wrap = 0;
95        img->u8 = 1;
96    }
97
98    pipi_set_colorspace(img, img->codec_format);
99    SDL_SaveBMP(img->codec_priv, name);
100
101    return 0;
102}
103
104/*
105 * XXX: The following functions are local.
106 */
107
108static int pipi_free_sdl(pipi_image_t *img)
109{
110    SDL_FreeSurface(img->codec_priv);
111
112    return 0;
113}
114
115static SDL_Surface *create_32bpp_surface(int w, int h)
116{
117    Uint32 rmask, gmask, bmask, amask;
118#if SDL_BYTEORDER == SDL_BIG_ENDIAN
119    rmask = 0xff000000;
120    gmask = 0x00ff0000;
121    bmask = 0x0000ff00;
122    amask = 0x00000000;
123#else
124    rmask = 0x000000ff;
125    gmask = 0x0000ff00;
126    bmask = 0x00ff0000;
127    amask = 0x00000000;
128#endif
129
130    return SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 32,
131                                rmask, gmask, bmask, amask);
132}
133
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