Subversion Repositories shark

Rev

Go to most recent revision | Details | Last modification | View Log | RSS feed

Rev Author Line No. Line
1141 giacomo 1
/*
2
 * Project: S.Ha.R.K.
3
 *
4
 * Coordinators:
5
 *   Giorgio Buttazzo    <giorgio@sssup.it>
6
 *   Paolo Gai           <pj@gandalf.sssup.it>
7
 *
8
 * Authors     :
9
 *   Giacomo Guidi       <giacomo@gandalf.sssup.it>
10
 *
11
 *
12
 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
13
 *
14
 * http://www.sssup.it
15
 * http://retis.sssup.it
16
 * http://shark.sssup.it
17
 */
18
 
19
#include <stdio.h>
20
#include <stdlib.h>
21
#include <kernel/kern.h>
22
#include <ports/png.h>
23
 
24
void read_png_file(char *file_name, char **buffer, int *width, int *height, png_byte *color_type)
25
{
26
 
27
        int y;
28
        png_byte bit_depth;
29
 
30
        png_structp png_ptr;
31
        png_infop info_ptr;
32
        int number_of_passes;
33
        png_bytep * row_pointers;
34
 
35
        char header[8]; // 8 is the maximum size that can be checked
36
 
37
        /* open file and test for it being a png */
38
        FILE *fp = fopen(file_name, "rb");
39
        if (!fp) {
40
                cprintf("[read_png_file] File %s could not be opened for reading", file_name);
41
                sys_end();
42
        }
43
        fread(header, 1, 8, fp);
44
 
45
        if (png_sig_cmp(header, 0, 8))
46
                cprintf("[read_png_file] File %s is not recognized as a PNG file", file_name);
47
 
48
        /* initialize stuff */
49
 
50
        png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
51
 
52
        if (!png_ptr)
53
                cprintf("[read_png_file] png_create_read_struct failed");
54
 
55
        info_ptr = png_create_info_struct(png_ptr);
56
        if (!info_ptr)
57
                cprintf("[read_png_file] png_create_info_struct failed");
58
 
59
        png_init_io(png_ptr, fp);
60
        png_set_sig_bytes(png_ptr, 8);
61
 
62
        png_read_info(png_ptr, info_ptr);
63
 
64
        *width = info_ptr->width;
65
        *height = info_ptr->height;
66
        *color_type = info_ptr->color_type;
67
        bit_depth = info_ptr->bit_depth;
68
 
69
        number_of_passes = png_set_interlace_handling(png_ptr);
70
 
71
        png_read_update_info(png_ptr, info_ptr);
72
 
73
        row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * info_ptr->height);
74
        for (y=0; y<info_ptr->height; y++)
75
                row_pointers[y] = (png_byte*) malloc(info_ptr->rowbytes);
76
 
77
        png_read_image(png_ptr, row_pointers);
78
 
79
        if(info_ptr->color_type == PNG_COLOR_TYPE_RGB) {
80
                *buffer = malloc(info_ptr->height * info_ptr->rowbytes);
81
                for(y=0; y<info_ptr->height; y++)
82
                        memcpy(*buffer+y*info_ptr->rowbytes,row_pointers[y],info_ptr->rowbytes);
83
        } else {
84
                cprintf("Image is not RGB\n");
85
        }
86
 
87
        fclose(fp);
88
 
89
}
90
 
91
int main (int argc, char *argv[])
92
{
93
 
94
    char *Image = NULL;
95
    int ImgWidth = 0;
96
    int ImgHeight = 0;
97
    png_byte ImgColor = 0;
98
 
99
    read_png_file("test.png",&Image,&ImgWidth,&ImgHeight,&ImgColor);
100
 
101
    cprintf("Image ptr:%8d\n",(DWORD)Image);
102
    cprintf("Image Width:%d\n",ImgWidth);
103
    cprintf("Image Height:%d\n",ImgHeight);
104
    cprintf("Image Type:%d\n",ImgColor);
105
 
106
    free(Image);
107
 
108
    return 0;
109
 
110
}