diff options
Diffstat (limited to 'Imaging/libImaging/File.c')
| -rw-r--r-- | Imaging/libImaging/File.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/Imaging/libImaging/File.c b/Imaging/libImaging/File.c new file mode 100644 index 0000000..00f52d3 --- /dev/null +++ b/Imaging/libImaging/File.c @@ -0,0 +1,198 @@ +/* + * The Python Imaging Library + * $Id: File.c 2507 2005-09-10 14:53:47Z fredrik $ + * + * built-in image file handling + * + * history: + * 1995-11-26 fl Created, supports PGM/PPM + * 1996-08-07 fl Write "1" images as PGM + * 1999-02-21 fl Don't write non-standard modes + * + * Copyright (c) 1997-99 by Secret Labs AB. + * Copyright (c) 1995-96 by Fredrik Lundh. + * + * See the README file for information on usage and redistribution. + */ + + +#include "Imaging.h" + +#include <ctype.h> + +Imaging +ImagingOpenPPM(const char* infile) +{ + FILE* fp; + int i, c, v; + char* mode; + int x, y, max; + Imaging im; + + if (!infile) + return ImagingError_ValueError(NULL); + + fp = fopen(infile, "rb"); + if (!fp) + return ImagingError_IOError(); + + /* PPM magic */ + if (fgetc(fp) != 'P') + goto syntax; + switch (fgetc(fp)) { + case '4': /* FIXME: 1-bit images are not yet supported */ + goto syntax; + case '5': + mode = "L"; + break; + case '6': + mode = "RGB"; + break; + default: + goto syntax; + } + + i = 0; + c = fgetc(fp); + + x = y = max = 0; + + while (i < 3) { + + /* Ignore optional comment fields */ + while (c == '\n') { + c = fgetc(fp); + if (c == '#') { + do { + c = fgetc(fp); + if (c == EOF) + goto syntax; + } while (c != '\n'); + c = fgetc(fp); + } + } + + /* Skip forward to next value */ + while (isspace(c)) + c = fgetc(fp); + + /* And parse it */ + v = 0; + while (isdigit(c)) { + v = v * 10 + (c - '0'); + c = fgetc(fp); + } + + if (c == EOF) + goto syntax; + + switch (i++) { + case 0: + x = v; + break; + case 1: + y = v; + break; + case 2: + max = v; + break; + } + } + + im = ImagingNew(mode, x, y); + if (!im) + return NULL; + + /* if (max != 255) ... FIXME: does anyone ever use this feature? */ + + if (strcmp(im->mode, "L") == 0) { + + /* PPM "L" */ + for (y = 0; y < im->ysize; y++) + fread(im->image[y], 1, im->xsize, fp); + + } else { + + /* PPM "RGB" or PyPPM mode */ + for (y = 0; y < im->ysize; y++) + for (x = i = 0; x < im->xsize; x++, i += im->pixelsize) + fread(im->image[y]+i, 1, im->bands, fp); + + } + + fclose(fp); + + return im; + +syntax: + fclose(fp); + return ImagingError_IOError(); +} + + +int +ImagingSaveRaw(Imaging im, FILE* fp) +{ + int x, y, i; + + if (strcmp(im->mode, "1") == 0 || strcmp(im->mode, "L") == 0) { + + /* @PIL227: FIXME: for mode "1", map != 0 to 255 */ + + /* PGM "L" */ + for (y = 0; y < im->ysize; y++) + fwrite(im->image[y], 1, im->xsize, fp); + + } else { + + /* PPM "RGB" or other internal format */ + for (y = 0; y < im->ysize; y++) + for (x = i = 0; x < im->xsize; x++, i += im->pixelsize) + fwrite(im->image[y]+i, 1, im->bands, fp); + + } + + return 1; +} + + +int +ImagingSavePPM(Imaging im, const char* outfile) +{ + FILE* fp; + + if (!im) { + ImagingError_ValueError(NULL); + return 0; + } + + fp = fopen(outfile, "wb"); + if (!fp) { + ImagingError_IOError(); + return 0; + } + + if (strcmp(im->mode, "1") == 0 || strcmp(im->mode, "L") == 0) { + + /* Write "PGM" */ + fprintf(fp, "P5\n%d %d\n255\n", im->xsize, im->ysize); + + } else if (strcmp(im->mode, "RGB") == 0) { + + /* Write "PPM" */ + fprintf(fp, "P6\n%d %d\n255\n", im->xsize, im->ysize); + + } else { + + ImagingError_ModeError(); + return 0; + + } + + ImagingSaveRaw(im, fp); + + fclose(fp); + + return 1; +} + |