Merge libdimension-png into libdimension.

1 files changed, 0 insertions, 328 deletions

diff --git a/libdimension-png/png.c b/libdimension-png/png.c
deleted file mode 100644
index 7e9036f..0000000
--- a/libdimension-png/png.c
+++ /dev/null
@@ -1,328 +0,0 @@
-/*************************************************************************
- * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com>               *
- *                                                                       *
- * This file is part of The Dimension Library.                           *
- *                                                                       *
- * The Dimension Library is free software; you can redistribute it and/  *
- * or modify it under the terms of the GNU Lesser General Public License *
- * as published by the Free Software Foundation; either version 3 of the *
- * License, or (at your option) any later version.                       *
- *                                                                       *
- * The Dimension Library is distributed in the hope that it will be      *
- * useful, but WITHOUT ANY WARRANTY; without even the implied warranty   *
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
- * Lesser General Public License for more details.                       *
- *                                                                       *
- * You should have received a copy of the GNU Lesser General Public      *
- * License along with this program.  If not, see                         *
- * <http://www.gnu.org/licenses/>.                                       *
- *************************************************************************/
-
-#include "dimension-png.h"
-#include <png.h>
-#include <setjmp.h>
-#include <arpa/inet.h>
-#include <stdlib.h>
-
-/* Write a canvas to a png file, using libpng.  Return 0 on success, nonzero on
-   failure. */
-int
-dmnsn_png_write_canvas(const dmnsn_canvas *canvas, FILE *file)
-{
-  png_structp png_ptr;
-  png_infop info_ptr;
-  png_uint_32 width, height;
-  unsigned int x, y;
-  uint16_t *row = NULL;
-  dmnsn_color color;
-  dmnsn_sRGB sRGB;
-
-  if (!file) return 1; /* file was NULL */
-
-  width = canvas->x;
-  height = canvas->y;
-
-  png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
-  if (!png_ptr) return 1; /* Couldn't create libpng write struct */
-
-  info_ptr = png_create_info_struct(png_ptr);
-  if (!info_ptr) {
-    /* Couldn't create libpng info struct */
-    png_destroy_write_struct(&png_ptr, NULL);
-    return 1;
-  }
-
-  /* libpng will longjmp here if it encounters an error from here on */
-  if (setjmp(png_jmpbuf(png_ptr))) {
-    /* libpng error */
-    if (row) free(row);
-    png_destroy_write_struct(&png_ptr, &info_ptr);
-    return 1;
-  }
-
-  /* Associate file with the libpng write struct */
-  png_init_io(png_ptr, file);
-
-  /* Set header correctly for 16-bit sRGB image */
-  png_set_IHDR(png_ptr, info_ptr, width, height, 16,
-               PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
-               PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
-  png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr, PNG_sRGB_INTENT_ABSOLUTE);
-
-  /* We think of transparency in the opposite way that PNG does */
-  png_set_invert_alpha(png_ptr);
-
-  /* Write the info struct */
-  png_write_info(png_ptr, info_ptr);
-
-  if (htonl(1) != 1) {
-    /* We are little-endian; swap the byte order of the pixels */
-    png_set_swap(png_ptr);
-  }
-
-  /* Allocate the temporary row of RGBA values */
-  row = malloc(4*sizeof(uint16_t)*width);
-  if (!row) {
-    png_destroy_write_struct(&png_ptr, &info_ptr);
-    return 1;
-  }
-
-  /* Write the pixels */
-  for (y = 0; y < height; ++y) {
-    for (x = 0; x < width; ++x) {
-      /* Invert the rows.  PNG coordinates are fourth quadrant. */
-      color = dmnsn_get_pixel(canvas, x, height - y - 1);
-      sRGB = dmnsn_sRGB_from_color(color);
-
-      /* Saturate R, G, and B to [0, UINT16_MAX] */
-
-      if (sRGB.R <= 0.0) {
-        row[4*x] = 0;
-      } else if (sRGB.R >= 1.0) {
-        row[4*x] = UINT16_MAX;
-      } else {
-        row[4*x] = sRGB.R*UINT16_MAX;
-      }
-
-      if (sRGB.G <= 0.0) {
-        row[4*x + 1] = 0;
-      } else if (sRGB.G >= 1.0) {
-        row[4*x + 1] = UINT16_MAX;
-      } else {
-        row[4*x + 1] = sRGB.G*UINT16_MAX;
-      }
-
-      if (sRGB.B <= 0.0) {
-        row[4*x + 2] = 0;
-      } else if (sRGB.B >= 1.0) {
-        row[4*x + 2] = UINT16_MAX;
-      } else {
-        row[4*x + 2] = sRGB.B*UINT16_MAX;
-      }
-
-      /* color.filter + color.trans is in [0.0, 1.0] by definition */
-      row[4*x + 3] = (color.filter + color.trans)*UINT16_MAX;
-    }
-
-    /* Write the row */
-    png_write_row(png_ptr, (png_bytep)row);
-  }
-
-  /* Finish the PNG file */
-  png_write_end(png_ptr, info_ptr);
-
-  free(row);
-  png_destroy_write_struct(&png_ptr, &info_ptr);
-  return 0;
-}
-
-/* Read a canvas from the PNG file `file'.  Return NULL on error. */
-dmnsn_canvas *
-dmnsn_png_read_canvas(FILE *file)
-{
-  dmnsn_canvas *canvas;
-  png_byte header[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
-  png_structp png_ptr;
-  png_infop info_ptr;
-  png_uint_32 width, height, rowbytes;
-  int bit_depth, color_type, interlace_type, compression_type, filter_method;
-  png_bytep image = NULL;
-  png_bytep *row_pointers = NULL;
-  unsigned int x, y;
-  dmnsn_color color;
-  dmnsn_sRGB sRGB;
-  png_bytep png_pixel;
-
-  if (!file) return NULL; /* file was NULL */
-
-  fread(header, 1, 8, file);
-  if (png_sig_cmp(header, 0, 8)) return NULL; /* file is not a PNG file */
-
-  /* Create the libpng read struct */
-  png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
-  if (!png_ptr) return NULL;
-
-  /* Create the libpng info struct */
-  info_ptr = png_create_info_struct(png_ptr);
-  if (!info_ptr) {
-    png_destroy_read_struct(&png_ptr, NULL, NULL);
-    return NULL;
-  }
-
-  /* libpng will longjmp here if it encounters an error from here on */
-  if (setjmp(png_jmpbuf(png_ptr))) {
-    /* libpng error */
-    if (row_pointers) free(row_pointers);
-    if (image) free(image);
-    png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
-    return NULL;
-  }
-
-  /* Associate the read struct with the file, and tell it we've already checked
-     8 bytes of signature */
-  png_init_io(png_ptr, file);
-  png_set_sig_bytes(png_ptr, 8);
-
-  /* Read the PNG header into info struct */
-  png_read_info(png_ptr, info_ptr);
-
-  /* Get useful information from the info struct */
-  png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
-               &interlace_type, &compression_type, &filter_method);
-
-  /*
-   * - Convert paletted images to RGB.
-   * - Convert a tRNS chunk to an alpha channel
-   * - Convert grayscale to RGB
-   * - Invert the alpha channel
-   */
-  if (color_type == PNG_COLOR_TYPE_PALETTE) {
-    png_set_palette_to_rgb(png_ptr);
-  }
-  if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
-    png_set_tRNS_to_alpha(png_ptr);
-  }
-  if (color_type == PNG_COLOR_TYPE_GRAY
-      || color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
-          png_set_gray_to_rgb(png_ptr);
-  }
-  png_set_invert_alpha(png_ptr);
-
-  /* Update the info struct */
-  png_read_update_info(png_ptr, info_ptr);
-
-  /* Get bytes/image row */
-  rowbytes = png_get_rowbytes(png_ptr, info_ptr);
-
-  /* Allocate the temporary image buffer */
-  image = malloc(rowbytes*height);
-  if (!image) {
-    png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
-    return NULL;
-  }
-
-  /* Allocate and set an array of pointers to rows in image */
-
-  row_pointers = malloc(sizeof(png_bytep)*height);
-  if (!row_pointers) {
-    free(image);
-    png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
-    return NULL;
-  }
-
-  for (y = 0; y < height; ++y) {
-    row_pointers[y] = image + y*rowbytes;
-  }
-
-  /* Read the image to image all at once.  At the expense of greater memory use,
-     this handles interlacing for us. */
-  png_read_image(png_ptr, row_pointers);
-
-  /* Allocate the canvas */
-  canvas = dmnsn_new_canvas(width, height);
-  if (!canvas) {
-    free(row_pointers);
-    free(image);
-    png_read_end(png_ptr, NULL);
-    png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
-    return NULL;
-  }
-
-  /* Now we convert the image to our canvas format.  This depends on the image
-     bit depth (which has been scaled up to at least 8 or 16), and the presence
-     of an alpha channel.  For performance reasons, the tests are outside the
-     loops, although that doesn't really matter for a decent compiler. */
-  if (bit_depth == 16) {
-    if (color_type & PNG_COLOR_MASK_ALPHA) {
-      for (x = 0; x < width; ++x) {
-        for (y = 0; y < height; ++y) {
-          png_pixel = image + 8*(y*width + x);
-
-          sRGB.R = ((double)((png_pixel[0] << UINT16_C(8)) + png_pixel[1]))
-            /UINT16_MAX;
-          sRGB.G = ((double)((png_pixel[2] << UINT16_C(8)) + png_pixel[3]))
-            /UINT16_MAX;
-          sRGB.B = ((double)((png_pixel[4] << UINT16_C(8)) + png_pixel[5]))
-            /UINT16_MAX;
-
-          color       = dmnsn_color_from_sRGB(sRGB);
-          color.trans = ((double)((png_pixel[6] << UINT16_C(8))
-                                  + png_pixel[7]))/UINT16_MAX;
-          dmnsn_set_pixel(canvas, x, height - y - 1, color);
-        }
-      }
-    } else {
-      for (x = 0; x < width; ++x) {
-        for (y = 0; y < height; ++y) {
-          png_pixel = image + 6*(y*width + x);
-
-          sRGB.R = ((double)((png_pixel[0] << UINT16_C(8)) + png_pixel[1]))
-            /UINT16_MAX;
-          sRGB.G = ((double)((png_pixel[2] << UINT16_C(8)) + png_pixel[3]))
-            /UINT16_MAX;
-          sRGB.B = ((double)((png_pixel[4] << UINT16_C(8)) + png_pixel[5]))
-            /UINT16_MAX;
-
-          color = dmnsn_color_from_sRGB(sRGB);
-          dmnsn_set_pixel(canvas, x, height - y - 1, color);
-        }
-      }
-    }
-  } else {
-    /* Bit depth is 8 */
-    if (color_type & PNG_COLOR_MASK_ALPHA) {
-      for (x = 0; x < width; ++x) {
-        for (y = 0; y < height; ++y) {
-          png_pixel = image + 4*(y*width + x);
-
-          sRGB.R = ((double)png_pixel[0])/UINT8_MAX;
-          sRGB.G = ((double)png_pixel[1])/UINT8_MAX;
-          sRGB.B = ((double)png_pixel[2])/UINT8_MAX;
-
-          color       = dmnsn_color_from_sRGB(sRGB);
-          color.trans = ((double)png_pixel[3])/UINT8_MAX;
-          dmnsn_set_pixel(canvas, x, height - y - 1, color);
-        }
-      }
-    } else {
-      for (x = 0; x < width; ++x) {
-        for (y = 0; y < height; ++y) {
-          png_pixel = image + 3*(y*width + x);
-
-          sRGB.R = ((double)png_pixel[0])/UINT8_MAX;
-          sRGB.G = ((double)png_pixel[1])/UINT8_MAX;
-          sRGB.B = ((double)png_pixel[2])/UINT8_MAX;
-
-          color = dmnsn_color_from_sRGB(sRGB);
-          dmnsn_set_pixel(canvas, x, height - y - 1, color);
-        }
-      }
-    }
-  }
-
-  free(row_pointers);
-  free(image);
-  png_read_end(png_ptr, NULL);
-  png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
-  return canvas;
-}