--- /dev/null
+/*
+ * "$Id: image-png.c 4741 2005-10-02 04:25:52Z mike $"
+ *
+ * PNG image routines for the Common UNIX Printing System (CUPS).
+ *
+ * Copyright 1993-2005 by Easy Software Products.
+ *
+ * These coded instructions, statements, and computer programs are the
+ * property of Easy Software Products 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 missing or damaged please contact Easy Software Products
+ * at:
+ *
+ * Attn: CUPS Licensing Information
+ * Easy Software Products
+ * 44141 Airport View Drive, Suite 204
+ * Hollywood, Maryland 20636 USA
+ *
+ * Voice: (301) 373-9600
+ * EMail: cups-info@cups.org
+ * WWW: 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 */
+ 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);
+
+ fprintf(stderr, "DEBUG: PNG image: %dx%dx%d, color_type=%x (%s%s%s)\n",
+ (int)info->width, (int)info->height, info->bit_depth, info->color_type,
+ (info->color_type & PNG_COLOR_MASK_COLOR) ? "RGB" : "GRAYSCALE",
+ (info->color_type & PNG_COLOR_MASK_ALPHA) ? "+ALPHA" : "",
+ (info->color_type & PNG_COLOR_MASK_PALETTE) ? "+PALETTE" : "");
+
+ if (info->color_type & PNG_COLOR_MASK_PALETTE)
+ png_set_expand(pp);
+ else if (info->bit_depth < 8)
+ {
+ png_set_packing(pp);
+ png_set_expand(pp);
+ }
+ else if (info->bit_depth == 16)
+ png_set_strip_16(pp);
+
+ if (info->color_type & PNG_COLOR_MASK_COLOR)
+ img->colorspace = (primary == CUPS_IMAGE_RGB_CMYK) ? CUPS_IMAGE_RGB : primary;
+ else
+ img->colorspace = secondary;
+
+ if (info->width == 0 || info->width > CUPS_IMAGE_MAX_WIDTH ||
+ info->height == 0 || info->height > CUPS_IMAGE_MAX_HEIGHT)
+ {
+ fprintf(stderr, "ERROR: PNG image has invalid dimensions %ux%u!\n",
+ (unsigned)info->width, (unsigned)info->height);
+ fclose(fp);
+ return (1);
+ }
+
+ img->xsize = info->width;
+ img->ysize = info->height;
+
+ if (info->valid & PNG_INFO_pHYs &&
+ info->phys_unit_type == PNG_RESOLUTION_METER)
+ {
+ img->xppi = (int)((float)info->x_pixels_per_unit * 0.0254);
+ img->yppi = (int)((float)info->y_pixels_per_unit * 0.0254);
+
+ if (img->xppi == 0 || img->yppi == 0)
+ {
+ fprintf(stderr, "ERROR: 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 (info->color_type == PNG_COLOR_TYPE_GRAY ||
+ info->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...
+ */
+
+ if (info->color_type == PNG_COLOR_TYPE_GRAY ||
+ info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+ in = malloc(img->xsize * img->ysize);
+ else
+ in = malloc(img->xsize * img->ysize * 3);
+ }
+
+ bpp = cupsImageGetDepth(img);
+ out = malloc(img->xsize * bpp);
+
+ /*
+ * 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 (info->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 :
+ memcpy(out, inptr, img->xsize * 3);
+ 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 (info->color_type & PNG_COLOR_MASK_COLOR)
+ inptr += img->xsize * 3;
+ else
+ inptr += img->xsize;
+ }
+ }
+
+ png_read_end(pp, info);
+ png_read_destroy(pp, info, NULL);
+
+ fclose(fp);
+ free(in);
+ free(out);
+
+ return (0);
+}
+#endif /* HAVE_LIBPNG && HAVE_LIBZ */
+
+
+/*
+ * End of "$Id: image-png.c 4741 2005-10-02 04:25:52Z mike $".
+ */
projects / thirdparty / cups.git / blobdiff