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Imported from libpng-0.99.tar

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This commit is contained in:
Glenn Randers-Pehrson
1998-01-30 21:45:12 -06:00
parent c4a2ae6cac
commit 46f61e2398
25 changed files with 856 additions and 187 deletions
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177
pngget.c
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@@ -1,12 +1,12 @@
/* pngget.c - retrieval of values from info struct
*
* libpng 0.98
* libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998
* January 30, 1998
*/
#define PNG_INTERNAL
@@ -30,6 +30,179 @@ png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
return(0);
}
#ifdef PNG_EASY_ACCESS_SUPPORTED
/* easy access to info, added in libpng-0.99 */
png_uint_32
png_get_image_width(png_structp png_ptr, png_infop info_ptr)
{
if (info_ptr != NULL)
{
return info_ptr->width;
}
return (0);
}
png_uint_32
png_get_image_height(png_structp png_ptr, png_infop info_ptr)
{
if (info_ptr != NULL)
{
return info_ptr->height;
}
return (0);
}
png_byte
png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
{
if (info_ptr != NULL)
{
return info_ptr->bit_depth;
}
return (0);
}
png_byte
png_get_color_type(png_structp png_ptr, png_infop info_ptr)
{
if (info_ptr != NULL)
{
return info_ptr->color_type;
}
return (0);
}
png_byte
png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
{
if (info_ptr != NULL)
{
return info_ptr->filter_type;
}
return (0);
}
png_byte
png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
{
if (info_ptr != NULL)
{
return info_ptr->interlace_type;
}
return (0);
}
png_byte
png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
{
if (info_ptr != NULL)
{
return info_ptr->compression_type;
}
return (0);
}
png_uint_32
png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
{
#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
if (info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_pixels_per_meter");
if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
return (0);
else return (info_ptr->x_pixels_per_unit);
}
else
#endif
return (0);
}
float
png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
{
#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
if (info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_aspect_ratio");
if (info_ptr->x_pixels_per_unit == 0)
return NULL;
else
return (float)info_ptr->y_pixels_per_unit
/(float)info_ptr->x_pixels_per_unit;
}
else
#endif
return (0);
}
png_uint_32
png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr)
{
#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
if (info_ptr != NULL && info_ptr->valid & PNG_INFO_oFFs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");
if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
return (0);
else return (info_ptr->x_offset);
}
else
#endif
return (0);
}
png_uint_32
png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr)
{
#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
if (info_ptr != NULL && info_ptr->valid & PNG_INFO_oFFs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");
if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
return (0);
else return (info_ptr->y_offset);
}
else
#endif
return (0);
}
png_uint_32
png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr)
{
#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
if (info_ptr != NULL && info_ptr->valid & PNG_INFO_oFFs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");
if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
return (0);
else return (info_ptr->x_offset);
}
else
#endif
return (0);
}
png_uint_32
png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr)
{
#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
if (info_ptr != NULL && info_ptr->valid & PNG_INFO_oFFs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");
if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
return (0);
else return (info_ptr->y_offset);
}
else
#endif
return (0);
}
/* png_get_channels really belongs in here, too, but it's been around longer */
#endif
png_byte
png_get_channels(png_structp png_ptr, png_infop info_ptr)
{