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[libpng10] Imported from libpng-1.0.13.tar

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This commit is contained in:
Glenn Randers-Pehrson
2002-04-15 09:19:46 -05:00
parent e68f5a361b
commit 80b4f15ae3
104 changed files with 3675 additions and 11492 deletions
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97
pngwutil.c
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@@ -1,9 +1,9 @@
/* pngwutil.c - utilities to write a PNG file
*
* libpng 1.0.12beta1 - May 14, 2001
* libpng 1.0.13 - April 15, 2002
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2001 Glenn Randers-Pehrson
* Copyright (c) 1998-2002 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*/
@@ -25,7 +25,7 @@ png_save_uint_32(png_bytep buf, png_uint_32 i)
buf[3] = (png_byte)(i & 0xff);
}
#if defined(PNG_WRITE_pCAL_SUPPORTED)
#if defined(PNG_WRITE_pCAL_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
/* The png_save_int_32 function assumes integers are stored in two's
* complement format. If this isn't the case, then this routine needs to
* be modified to write data in two's complement format.
@@ -332,7 +332,8 @@ png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
/* handle the no-compression case */
if (comp->input)
{
png_write_chunk_data(png_ptr, (png_bytep)comp->input, comp->input_len);
png_write_chunk_data(png_ptr, (png_bytep)comp->input,
(png_size_t)comp->input_len);
return;
}
@@ -537,8 +538,7 @@ png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal)
png_debug(1, "in png_write_PLTE\n");
if ((
#if defined(PNG_MNG_FEATURES_SUPPORTED) || \
defined(PNG_WRITE_EMPTY_PLTE_PERMITTED)
#if defined(PNG_MNG_FEATURES_SUPPORTED)
!(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) &&
#endif
num_pal == 0) || num_pal > 256)
@@ -608,7 +608,8 @@ png_write_IEND(png_structp png_ptr)
PNG_IEND;
#endif
png_debug(1, "in png_write_IEND\n");
png_write_chunk(png_ptr, (png_bytep)png_IEND, NULL, (png_size_t)0);
png_write_chunk(png_ptr, (png_bytep)png_IEND, png_bytep_NULL,
(png_size_t)0);
png_ptr->mode |= PNG_HAVE_IEND;
}
@@ -642,7 +643,7 @@ png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma)
png_debug(1, "in png_write_gAMA\n");
/* file_gamma is saved in 1/100,000ths */
png_save_uint_32(buf, file_gamma);
png_save_uint_32(buf, (png_uint_32)file_gamma);
png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
}
#endif
@@ -764,7 +765,7 @@ png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette)
png_save_uint_16(entrybuf + 6, ep->alpha);
png_save_uint_16(entrybuf + 8, ep->frequency);
}
png_write_chunk_data(png_ptr, entrybuf, entry_size);
png_write_chunk_data(png_ptr, entrybuf, (png_size_t)entry_size);
}
#else
ep=spalette->entries;
@@ -939,32 +940,32 @@ png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
#endif
return;
}
png_save_uint_32(buf, white_x);
png_save_uint_32(buf + 4, white_y);
png_save_uint_32(buf, (png_uint_32)white_x);
png_save_uint_32(buf + 4, (png_uint_32)white_y);
if (red_x > 80000L || red_y > 80000L || red_x + red_y > 100000L)
{
png_warning(png_ptr, "Invalid cHRM fixed red point specified");
return;
}
png_save_uint_32(buf + 8, red_x);
png_save_uint_32(buf + 12, red_y);
png_save_uint_32(buf + 8, (png_uint_32)red_x);
png_save_uint_32(buf + 12, (png_uint_32)red_y);
if (green_x > 80000L || green_y > 80000L || green_x + green_y > 100000L)
{
png_warning(png_ptr, "Invalid fixed cHRM green point specified");
return;
}
png_save_uint_32(buf + 16, green_x);
png_save_uint_32(buf + 20, green_y);
png_save_uint_32(buf + 16, (png_uint_32)green_x);
png_save_uint_32(buf + 20, (png_uint_32)green_y);
if (blue_x > 80000L || blue_y > 80000L || blue_x + blue_y > 100000L)
{
png_warning(png_ptr, "Invalid fixed cHRM blue point specified");
return;
}
png_save_uint_32(buf + 24, blue_x);
png_save_uint_32(buf + 28, blue_y);
png_save_uint_32(buf + 24, (png_uint_32)blue_x);
png_save_uint_32(buf + 28, (png_uint_32)blue_y);
png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
}
@@ -996,6 +997,12 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
else if (color_type == PNG_COLOR_TYPE_GRAY)
{
/* one 16 bit value */
if(tran->gray >= (1 << png_ptr->bit_depth))
{
png_warning(png_ptr,
"Ignoring attempt to write tRNS chunk out-of-range for bit_depth");
return;
}
png_save_uint_16(buf, tran->gray);
png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)2);
}
@@ -1005,6 +1012,12 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
png_save_uint_16(buf, tran->red);
png_save_uint_16(buf + 2, tran->green);
png_save_uint_16(buf + 4, tran->blue);
if(png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]))
{
png_warning(png_ptr,
"Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8");
return;
}
png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)6);
}
else
@@ -1028,8 +1041,7 @@ png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
if (color_type == PNG_COLOR_TYPE_PALETTE)
{
if (
#if defined(PNG_MNG_FEATURES_SUPPORTED) || \
defined(PNG_WRITE_EMPTY_PLTE_PERMITTED)
#if defined(PNG_MNG_FEATURES_SUPPORTED)
(png_ptr->num_palette ||
(!(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE))) &&
#endif
@@ -1046,10 +1058,22 @@ png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
png_save_uint_16(buf, back->red);
png_save_uint_16(buf + 2, back->green);
png_save_uint_16(buf + 4, back->blue);
if(png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]))
{
png_warning(png_ptr,
"Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8");
return;
}
png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)6);
}
else
{
if(back->gray >= (1 << png_ptr->bit_depth))
{
png_warning(png_ptr,
"Ignoring attempt to write bKGD chunk out-of-range for bit_depth");
return;
}
png_save_uint_16(buf, back->gray);
png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)2);
}
@@ -1325,22 +1349,28 @@ png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
png_warning(png_ptr, "Empty keyword in iTXt chunk");
return;
}
if (lang == NULL || (lang_len = png_check_keyword(png_ptr, lang,
&new_lang))==0)
if (lang == NULL || (lang_len = png_check_keyword(png_ptr, lang, &new_lang))==0)
{
png_warning(png_ptr, "Empty language field in iTXt chunk");
return;
new_lang = NULL;
lang_len = 0;
}
lang_key_len = png_strlen(lang_key);
text_len = png_strlen(text);
if (text == NULL || *text == '\0')
if (lang_key == NULL)
lang_key_len = 0;
else
lang_key_len = png_strlen(lang_key);
if (text == NULL)
text_len = 0;
else
text_len = png_strlen(text);
/* compute the compressed data; do it now for the length */
text_len = png_text_compress(png_ptr, text, text_len, compression-2,
&comp);
/* make sure we include the compression flag, the compression byte,
* and the NULs after the key, lang, and lang_key parts */
@@ -1370,23 +1400,22 @@ png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
cbuf[1] = 0;
png_write_chunk_data(png_ptr, cbuf, 2);
png_write_chunk_data(png_ptr, (png_bytep)new_lang, lang_len + 1);
png_write_chunk_data(png_ptr, (png_bytep)lang_key, lang_key_len+1);
png_write_chunk_data(png_ptr, '\0', 1);
cbuf[0] = 0;
png_write_chunk_data(png_ptr, (new_lang ? (png_bytep)new_lang : cbuf), lang_len + 1);
png_write_chunk_data(png_ptr, (lang_key ? (png_bytep)lang_key : cbuf), lang_key_len + 1);
png_write_compressed_data_out(png_ptr, &comp);
png_write_chunk_end(png_ptr);
png_free(png_ptr, new_key);
png_free(png_ptr, new_lang);
if (new_lang)
png_free(png_ptr, new_lang);
}
#endif
#if defined(PNG_WRITE_oFFs_SUPPORTED)
/* write the oFFs chunk */
void /* PRIVATE */
png_write_oFFs(png_structp png_ptr, png_uint_32 x_offset,
png_uint_32 y_offset,
png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset,
int unit_type)
{
#ifdef PNG_USE_LOCAL_ARRAYS
@@ -1398,8 +1427,8 @@ png_write_oFFs(png_structp png_ptr, png_uint_32 x_offset,
if (unit_type >= PNG_OFFSET_LAST)
png_warning(png_ptr, "Unrecognized unit type for oFFs chunk");
png_save_uint_32(buf, x_offset);
png_save_uint_32(buf + 4, y_offset);
png_save_int_32(buf, x_offset);
png_save_int_32(buf + 4, y_offset);
buf[8] = (png_byte)unit_type;
png_write_chunk(png_ptr, (png_bytep)png_oFFs, buf, (png_size_t)9);