Rev 1144 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1141 | giacomo | 1 | /* |
| 2 | * Project: S.Ha.R.K. |
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| 3 | * |
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| 4 | * Coordinators: |
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| 5 | * Giorgio Buttazzo <giorgio@sssup.it> |
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| 6 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 7 | * |
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| 8 | * Authors : |
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| 9 | * Giacomo Guidi <giacomo@gandalf.sssup.it> |
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| 10 | * |
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| 11 | * |
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| 12 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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| 13 | * |
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| 14 | * http://www.sssup.it |
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| 15 | * http://retis.sssup.it |
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| 16 | * http://shark.sssup.it |
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| 17 | */ |
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| 18 | |||
| 19 | #include <stdio.h> |
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| 20 | #include <stdlib.h> |
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| 21 | #include <kernel/kern.h> |
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| 1144 | pj | 22 | #include <png.h> |
| 1141 | giacomo | 23 | |
| 24 | void read_png_file(char *file_name, char **buffer, int *width, int *height, png_byte *color_type) |
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| 25 | { |
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| 26 | |||
| 27 | int y; |
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| 28 | png_byte bit_depth; |
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| 29 | |||
| 30 | png_structp png_ptr; |
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| 31 | png_infop info_ptr; |
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| 32 | int number_of_passes; |
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| 33 | png_bytep * row_pointers; |
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| 34 | |||
| 35 | char header[8]; // 8 is the maximum size that can be checked |
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| 36 | |||
| 37 | /* open file and test for it being a png */ |
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| 38 | FILE *fp = fopen(file_name, "rb"); |
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| 39 | if (!fp) { |
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| 40 | cprintf("[read_png_file] File %s could not be opened for reading", file_name); |
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| 1550 | pj | 41 | exit(1); |
| 1141 | giacomo | 42 | } |
| 43 | fread(header, 1, 8, fp); |
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| 44 | |||
| 45 | if (png_sig_cmp(header, 0, 8)) |
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| 46 | cprintf("[read_png_file] File %s is not recognized as a PNG file", file_name); |
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| 47 | |||
| 48 | /* initialize stuff */ |
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| 49 | |||
| 50 | png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); |
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| 51 | |||
| 52 | if (!png_ptr) |
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| 53 | cprintf("[read_png_file] png_create_read_struct failed"); |
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| 54 | |||
| 55 | info_ptr = png_create_info_struct(png_ptr); |
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| 56 | if (!info_ptr) |
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| 57 | cprintf("[read_png_file] png_create_info_struct failed"); |
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| 58 | |||
| 59 | png_init_io(png_ptr, fp); |
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| 60 | png_set_sig_bytes(png_ptr, 8); |
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| 61 | |||
| 62 | png_read_info(png_ptr, info_ptr); |
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| 63 | |||
| 64 | *width = info_ptr->width; |
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| 65 | *height = info_ptr->height; |
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| 66 | *color_type = info_ptr->color_type; |
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| 67 | bit_depth = info_ptr->bit_depth; |
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| 68 | |||
| 69 | number_of_passes = png_set_interlace_handling(png_ptr); |
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| 70 | |||
| 71 | png_read_update_info(png_ptr, info_ptr); |
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| 72 | |||
| 73 | row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * info_ptr->height); |
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| 74 | for (y=0; y<info_ptr->height; y++) |
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| 75 | row_pointers[y] = (png_byte*) malloc(info_ptr->rowbytes); |
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| 76 | |||
| 77 | png_read_image(png_ptr, row_pointers); |
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| 78 | |||
| 79 | if(info_ptr->color_type == PNG_COLOR_TYPE_RGB) { |
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| 80 | *buffer = malloc(info_ptr->height * info_ptr->rowbytes); |
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| 81 | for(y=0; y<info_ptr->height; y++) |
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| 82 | memcpy(*buffer+y*info_ptr->rowbytes,row_pointers[y],info_ptr->rowbytes); |
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| 83 | } else { |
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| 84 | cprintf("Image is not RGB\n"); |
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| 85 | } |
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| 86 | |||
| 87 | fclose(fp); |
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| 88 | |||
| 89 | } |
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| 90 | |||
| 91 | int main (int argc, char *argv[]) |
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| 92 | { |
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| 93 | |||
| 94 | char *Image = NULL; |
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| 95 | int ImgWidth = 0; |
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| 96 | int ImgHeight = 0; |
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| 97 | png_byte ImgColor = 0; |
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| 98 | |||
| 99 | read_png_file("test.png",&Image,&ImgWidth,&ImgHeight,&ImgColor); |
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| 100 | |||
| 101 | cprintf("Image ptr:%8d\n",(DWORD)Image); |
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| 102 | cprintf("Image Width:%d\n",ImgWidth); |
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| 103 | cprintf("Image Height:%d\n",ImgHeight); |
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| 104 | cprintf("Image Type:%d\n",ImgColor); |
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| 105 | |||
| 106 | free(Image); |
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| 107 | |||
| 108 | return 0; |
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| 109 | |||
| 110 | } |