+++ /dev/null
-/*
- * "$Id: image-png.c 7437 2008-04-09 03:16:10Z mike $"
- *
- * PNG image routines for CUPS.
- *
- * Copyright 2007-2011 by Apple Inc.
- * Copyright 1993-2007 by Easy Software Products.
- *
- * These coded instructions, statements, and computer programs are the
- * property of Apple Inc. and are protected by Federal copyright
- * law. Distribution and use rights are outlined in the file "LICENSE.txt"
- * which should have been included with this file. If this file is
- * file is missing or damaged, see the license at "http://www.cups.org/".
- *
- * This file is subject to the Apple OS-Developed Software exception.
- *
- * Contents:
- *
- * _cupsImageReadPNG() - Read a PNG image file.
- */
-
-/*
- * Include necessary headers...
- */
-
-#include "image-private.h"
-
-#if defined(HAVE_LIBPNG) && defined(HAVE_LIBZ)
-# include <png.h> /* Portable Network Graphics (PNG) definitions */
-
-
-/*
- * '_cupsImageReadPNG()' - Read a PNG image file.
- */
-
-int /* O - Read status */
-_cupsImageReadPNG(
- cups_image_t *img, /* IO - cupsImage */
- FILE *fp, /* I - cupsImage file */
- cups_icspace_t primary, /* I - Primary choice for colorspace */
- cups_icspace_t secondary, /* I - Secondary choice for colorspace */
- int saturation, /* I - Color saturation (%) */
- int hue, /* I - Color hue (degrees) */
- const cups_ib_t *lut) /* I - Lookup table for gamma/brightness */
-{
- int y; /* Looping var */
- png_structp pp; /* PNG read pointer */
- png_infop info; /* PNG info pointers */
- png_uint_32 width, /* Width of image */
- height; /* Height of image */
- int bit_depth, /* Bit depth */
- color_type, /* Color type */
- interlace_type, /* Interlace type */
- compression_type, /* Compression type */
- filter_type; /* Filter type */
- png_uint_32 xppm, /* X pixels per meter */
- yppm; /* Y pixels per meter */
- int bpp; /* Bytes per pixel */
- int pass, /* Current pass */
- passes; /* Number of passes required */
- cups_ib_t *in, /* Input pixels */
- *inptr, /* Pointer into pixels */
- *out; /* Output pixels */
- png_color_16 bg; /* Background color */
-
-
- /*
- * Setup the PNG data structures...
- */
-
- pp = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
- info = png_create_info_struct(pp);
-
- /*
- * Initialize the PNG read "engine"...
- */
-
- png_init_io(pp, fp);
-
- /*
- * Get the image dimensions and load the output image...
- */
-
- png_read_info(pp, info);
-
- png_get_IHDR(pp, info, &width, &height, &bit_depth, &color_type,
- &interlace_type, &compression_type, &filter_type);
-
- fprintf(stderr, "DEBUG: PNG image: %dx%dx%d, color_type=%x (%s%s%s)\n",
- (int)width, (int)height, bit_depth, color_type,
- (color_type & PNG_COLOR_MASK_COLOR) ? "RGB" : "GRAYSCALE",
- (color_type & PNG_COLOR_MASK_ALPHA) ? "+ALPHA" : "",
- (color_type & PNG_COLOR_MASK_PALETTE) ? "+PALETTE" : "");
-
- if (color_type & PNG_COLOR_MASK_PALETTE)
- png_set_expand(pp);
- else if (bit_depth < 8)
- {
- png_set_packing(pp);
- png_set_expand(pp);
- }
- else if (bit_depth == 16)
- png_set_strip_16(pp);
-
- if (color_type & PNG_COLOR_MASK_COLOR)
- img->colorspace = (primary == CUPS_IMAGE_RGB_CMYK) ? CUPS_IMAGE_RGB :
- primary;
- else
- img->colorspace = secondary;
-
- if (width == 0 || width > CUPS_IMAGE_MAX_WIDTH ||
- height == 0 || height > CUPS_IMAGE_MAX_HEIGHT)
- {
- fprintf(stderr, "DEBUG: PNG image has invalid dimensions %ux%u!\n",
- (unsigned)width, (unsigned)height);
- fclose(fp);
- return (1);
- }
-
- img->xsize = width;
- img->ysize = height;
-
- if ((xppm = png_get_x_pixels_per_meter(pp, info)) != 0 &&
- (yppm = png_get_y_pixels_per_meter(pp, info)) != 0)
- {
- img->xppi = (int)((float)xppm * 0.0254);
- img->yppi = (int)((float)yppm * 0.0254);
-
- if (img->xppi == 0 || img->yppi == 0)
- {
- fprintf(stderr, "DEBUG: PNG image has invalid resolution %dx%d PPI\n",
- img->xppi, img->yppi);
-
- img->xppi = img->yppi = 128;
- }
- }
-
- cupsImageSetMaxTiles(img, 0);
-
- passes = png_set_interlace_handling(pp);
-
- /*
- * Handle transparency...
- */
-
- if (png_get_valid(pp, info, PNG_INFO_tRNS))
- png_set_tRNS_to_alpha(pp);
-
- bg.red = 65535;
- bg.green = 65535;
- bg.blue = 65535;
-
- png_set_background(pp, &bg, PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
-
- if (passes == 1)
- {
- /*
- * Load one row at a time...
- */
-
- if (color_type == PNG_COLOR_TYPE_GRAY ||
- color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
- in = malloc(img->xsize);
- else
- in = malloc(img->xsize * 3);
- }
- else
- {
- /*
- * Interlaced images must be loaded all at once...
- */
-
- size_t bufsize; /* Size of buffer */
-
-
- if (color_type == PNG_COLOR_TYPE_GRAY ||
- color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
- {
- bufsize = img->xsize * img->ysize;
-
- if ((bufsize / img->xsize) != img->ysize)
- {
- fprintf(stderr, "DEBUG: PNG image dimensions (%ux%u) too large!\n",
- (unsigned)width, (unsigned)height);
- fclose(fp);
- return (1);
- }
- }
- else
- {
- bufsize = img->xsize * img->ysize * 3;
-
- if ((bufsize / (img->xsize * 3)) != img->ysize)
- {
- fprintf(stderr, "DEBUG: PNG image dimensions (%ux%u) too large!\n",
- (unsigned)width, (unsigned)height);
- fclose(fp);
- return (1);
- }
- }
-
- in = malloc(bufsize);
- }
-
- bpp = cupsImageGetDepth(img);
- out = malloc(img->xsize * bpp);
-
- if (!in || !out)
- {
- fputs("DEBUG: Unable to allocate memory for PNG image!\n", stderr);
-
- if (in)
- free(in);
-
- if (out)
- free(out);
-
- fclose(fp);
-
- return (1);
- }
-
- /*
- * Read the image, interlacing as needed...
- */
-
- for (pass = 1; pass <= passes; pass ++)
- for (inptr = in, y = 0; y < img->ysize; y ++)
- {
- png_read_row(pp, (png_bytep)inptr, NULL);
-
- if (pass == passes)
- {
- /*
- * Output this row...
- */
-
- if (color_type & PNG_COLOR_MASK_COLOR)
- {
- if ((saturation != 100 || hue != 0) && bpp > 1)
- cupsImageRGBAdjust(inptr, img->xsize, saturation, hue);
-
- switch (img->colorspace)
- {
- case CUPS_IMAGE_WHITE :
- cupsImageRGBToWhite(inptr, out, img->xsize);
- break;
- case CUPS_IMAGE_RGB :
- case CUPS_IMAGE_RGB_CMYK :
- cupsImageRGBToRGB(inptr, out, img->xsize);
- break;
- case CUPS_IMAGE_BLACK :
- cupsImageRGBToBlack(inptr, out, img->xsize);
- break;
- case CUPS_IMAGE_CMY :
- cupsImageRGBToCMY(inptr, out, img->xsize);
- break;
- case CUPS_IMAGE_CMYK :
- cupsImageRGBToCMYK(inptr, out, img->xsize);
- break;
- }
- }
- else
- {
- switch (img->colorspace)
- {
- case CUPS_IMAGE_WHITE :
- memcpy(out, inptr, img->xsize);
- break;
- case CUPS_IMAGE_RGB :
- case CUPS_IMAGE_RGB_CMYK :
- cupsImageWhiteToRGB(inptr, out, img->xsize);
- break;
- case CUPS_IMAGE_BLACK :
- cupsImageWhiteToBlack(inptr, out, img->xsize);
- break;
- case CUPS_IMAGE_CMY :
- cupsImageWhiteToCMY(inptr, out, img->xsize);
- break;
- case CUPS_IMAGE_CMYK :
- cupsImageWhiteToCMYK(inptr, out, img->xsize);
- break;
- }
- }
-
- if (lut)
- cupsImageLut(out, img->xsize * bpp, lut);
-
- _cupsImagePutRow(img, 0, y, img->xsize, out);
- }
-
- if (passes > 1)
- {
- if (color_type & PNG_COLOR_MASK_COLOR)
- inptr += img->xsize * 3;
- else
- inptr += img->xsize;
- }
- }
-
- png_read_end(pp, info);
- png_destroy_read_struct(&pp, &info, NULL);
-
- fclose(fp);
- free(in);
- free(out);
-
- return (0);
-}
-#endif /* HAVE_LIBPNG && HAVE_LIBZ */
-
-
-/*
- * End of "$Id: image-png.c 7437 2008-04-09 03:16:10Z mike $".
- */
projects / thirdparty / cups.git / blobdiff