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Unified Diff: third_party/libpng/pngwtran.c

Issue 2021403002: Update libpng to 1.6.22 (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Rearrange pnglibconf.h Created 4 years, 6 months ago
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Index: third_party/libpng/pngwtran.c
diff --git a/third_party/libpng/pngwtran.c b/third_party/libpng/pngwtran.c
index a702cf92461fa7184879ee193cd9ff357454dd42..038a2ef5dcd5a7c5f97c3b0bf3cbe1b0305d9fab 100644
--- a/third_party/libpng/pngwtran.c
+++ b/third_party/libpng/pngwtran.c
@@ -1,8 +1,8 @@
/* pngwtran.c - transforms the data in a row for PNG writers
*
- * Last changed in libpng 1.2.43 [February 25, 2010]
- * Copyright (c) 1998-2002,2004,2006-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.6.18 [July 23, 2015]
+ * Copyright (c) 1998-2002,2004,2006-2015 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.)
*
@@ -11,92 +11,22 @@
* and license in png.h
*/
-#define PNG_INTERNAL
-#define PNG_NO_PEDANTIC_WARNINGS
-#include "png.h"
-#ifdef PNG_WRITE_SUPPORTED
-
-/* Transform the data according to the user's wishes. The order of
- * transformations is significant.
- */
-void /* PRIVATE */
-png_do_write_transformations(png_structp png_ptr)
-{
- png_debug(1, "in png_do_write_transformations");
-
- if (png_ptr == NULL)
- return;
+#include "pngpriv.h"
-#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
- if (png_ptr->transformations & PNG_USER_TRANSFORM)
- if (png_ptr->write_user_transform_fn != NULL)
- (*(png_ptr->write_user_transform_fn)) /* User write transform
- function */
- (png_ptr, /* png_ptr */
- &(png_ptr->row_info), /* row_info: */
- /* png_uint_32 width; width of row */
- /* png_uint_32 rowbytes; number of bytes in row */
- /* png_byte color_type; color type of pixels */
- /* png_byte bit_depth; bit depth of samples */
- /* png_byte channels; number of channels (1-4) */
- /* png_byte pixel_depth; bits per pixel (depth*channels) */
- png_ptr->row_buf + 1); /* start of pixel data for row */
-#endif
-#ifdef PNG_WRITE_FILLER_SUPPORTED
- if (png_ptr->transformations & PNG_FILLER)
- png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1,
- png_ptr->flags);
-#endif
-#ifdef PNG_WRITE_PACKSWAP_SUPPORTED
- if (png_ptr->transformations & PNG_PACKSWAP)
- png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1);
-#endif
-#ifdef PNG_WRITE_PACK_SUPPORTED
- if (png_ptr->transformations & PNG_PACK)
- png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1,
- (png_uint_32)png_ptr->bit_depth);
-#endif
-#ifdef PNG_WRITE_SWAP_SUPPORTED
- if (png_ptr->transformations & PNG_SWAP_BYTES)
- png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1);
-#endif
-#ifdef PNG_WRITE_SHIFT_SUPPORTED
- if (png_ptr->transformations & PNG_SHIFT)
- png_do_shift(&(png_ptr->row_info), png_ptr->row_buf + 1,
- &(png_ptr->shift));
-#endif
-#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
- if (png_ptr->transformations & PNG_SWAP_ALPHA)
- png_do_write_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
-#endif
-#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
- if (png_ptr->transformations & PNG_INVERT_ALPHA)
- png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
-#endif
-#ifdef PNG_WRITE_BGR_SUPPORTED
- if (png_ptr->transformations & PNG_BGR)
- png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1);
-#endif
-#ifdef PNG_WRITE_INVERT_SUPPORTED
- if (png_ptr->transformations & PNG_INVERT_MONO)
- png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1);
-#endif
-}
+#ifdef PNG_WRITE_SUPPORTED
+#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
#ifdef PNG_WRITE_PACK_SUPPORTED
/* Pack pixels into bytes. Pass the true bit depth in bit_depth. The
* row_info bit depth should be 8 (one pixel per byte). The channels
* should be 1 (this only happens on grayscale and paletted images).
*/
-void /* PRIVATE */
+static void
png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
{
png_debug(1, "in png_do_pack");
if (row_info->bit_depth == 8 &&
-#ifdef PNG_USELESS_TESTS_SUPPORTED
- row != NULL && row_info != NULL &&
-#endif
row_info->channels == 1)
{
switch ((int)bit_depth)
@@ -117,9 +47,12 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
{
if (*sp != 0)
v |= mask;
+
sp++;
+
if (mask > 1)
mask >>= 1;
+
else
{
mask = 0x80;
@@ -128,14 +61,18 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
v = 0;
}
}
+
if (mask != 0x80)
*dp = (png_byte)v;
+
break;
}
+
case 2:
{
png_bytep sp, dp;
- int shift, v;
+ unsigned int shift;
+ int v;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
@@ -143,12 +80,14 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
dp = row;
shift = 6;
v = 0;
+
for (i = 0; i < row_width; i++)
{
png_byte value;
value = (png_byte)(*sp & 0x03);
v |= (value << shift);
+
if (shift == 0)
{
shift = 6;
@@ -156,18 +95,24 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
dp++;
v = 0;
}
+
else
shift -= 2;
+
sp++;
}
+
if (shift != 6)
*dp = (png_byte)v;
+
break;
}
+
case 4:
{
png_bytep sp, dp;
- int shift, v;
+ unsigned int shift;
+ int v;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
@@ -175,6 +120,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
dp = row;
shift = 4;
v = 0;
+
for (i = 0; i < row_width; i++)
{
png_byte value;
@@ -189,20 +135,27 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
dp++;
v = 0;
}
+
else
shift -= 4;
sp++;
}
+
if (shift != 4)
*dp = (png_byte)v;
+
break;
}
+
+ default:
+ break;
}
+
row_info->bit_depth = (png_byte)bit_depth;
row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels);
row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
- row_info->width);
+ row_info->width);
}
}
#endif
@@ -215,40 +168,40 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
* would pass 3 as bit_depth, and this routine would translate the
* data to 0 to 15.
*/
-void /* PRIVATE */
-png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
+static void
+png_do_shift(png_row_infop row_info, png_bytep row,
+ png_const_color_8p bit_depth)
{
png_debug(1, "in png_do_shift");
-#ifdef PNG_USELESS_TESTS_SUPPORTED
- if (row != NULL && row_info != NULL &&
-#else
- if (
-#endif
- row_info->color_type != PNG_COLOR_TYPE_PALETTE)
+ if (row_info->color_type != PNG_COLOR_TYPE_PALETTE)
{
int shift_start[4], shift_dec[4];
int channels = 0;
- if (row_info->color_type & PNG_COLOR_MASK_COLOR)
+ if ((row_info->color_type & PNG_COLOR_MASK_COLOR) != 0)
{
shift_start[channels] = row_info->bit_depth - bit_depth->red;
shift_dec[channels] = bit_depth->red;
channels++;
+
shift_start[channels] = row_info->bit_depth - bit_depth->green;
shift_dec[channels] = bit_depth->green;
channels++;
+
shift_start[channels] = row_info->bit_depth - bit_depth->blue;
shift_dec[channels] = bit_depth->blue;
channels++;
}
+
else
{
shift_start[channels] = row_info->bit_depth - bit_depth->gray;
shift_dec[channels] = bit_depth->gray;
channels++;
}
- if (row_info->color_type & PNG_COLOR_MASK_ALPHA)
+
+ if ((row_info->color_type & PNG_COLOR_MASK_ALPHA) != 0)
{
shift_start[channels] = row_info->bit_depth - bit_depth->alpha;
shift_dec[channels] = bit_depth->alpha;
@@ -259,33 +212,40 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
if (row_info->bit_depth < 8)
{
png_bytep bp = row;
- png_uint_32 i;
- png_byte mask;
- png_uint_32 row_bytes = row_info->rowbytes;
+ png_size_t i;
+ unsigned int mask;
+ png_size_t row_bytes = row_info->rowbytes;
if (bit_depth->gray == 1 && row_info->bit_depth == 2)
mask = 0x55;
+
else if (row_info->bit_depth == 4 && bit_depth->gray == 3)
mask = 0x11;
+
else
mask = 0xff;
for (i = 0; i < row_bytes; i++, bp++)
{
- png_uint_16 v;
int j;
+ unsigned int v, out;
v = *bp;
- *bp = 0;
+ out = 0;
+
for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0])
{
if (j > 0)
- *bp |= (png_byte)((v << j) & 0xff);
+ out |= v << j;
+
else
- *bp |= (png_byte)((v >> (-j)) & mask);
+ out |= (v >> (-j)) & mask;
}
+
+ *bp = (png_byte)(out & 0xff);
}
}
+
else if (row_info->bit_depth == 8)
{
png_bytep bp = row;
@@ -295,21 +255,26 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
for (i = 0; i < istop; i++, bp++)
{
- png_uint_16 v;
+ const unsigned int c = i%channels;
int j;
- int c = (int)(i%channels);
+ unsigned int v, out;
v = *bp;
- *bp = 0;
+ out = 0;
+
for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
{
if (j > 0)
- *bp |= (png_byte)((v << j) & 0xff);
+ out |= v << j;
+
else
- *bp |= (png_byte)((v >> (-j)) & 0xff);
+ out |= v >> (-j);
}
+
+ *bp = (png_byte)(out & 0xff);
}
}
+
else
{
png_bytep bp;
@@ -318,20 +283,22 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
for (bp = row, i = 0; i < istop; i++)
{
- int c = (int)(i%channels);
- png_uint_16 value, v;
+ const unsigned int c = i%channels;
int j;
+ unsigned int value, v;
- v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1));
+ v = png_get_uint_16(bp);
value = 0;
+
for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
{
if (j > 0)
- value |= (png_uint_16)((v << j) & (png_uint_16)0xffff);
+ value |= v << j;
+
else
- value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff);
+ value |= v >> (-j);
}
- *bp++ = (png_byte)(value >> 8);
+ *bp++ = (png_byte)((value >> 8) & 0xff);
*bp++ = (png_byte)(value & 0xff);
}
}
@@ -340,23 +307,21 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
#endif
#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
-void /* PRIVATE */
+static void
png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_write_swap_alpha");
-#ifdef PNG_USELESS_TESTS_SUPPORTED
- if (row != NULL && row_info != NULL)
-#endif
{
if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
{
- /* This converts from ARGB to RGBA */
if (row_info->bit_depth == 8)
{
+ /* This converts from ARGB to RGBA */
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
+
for (i = 0, sp = dp = row; i < row_width; i++)
{
png_byte save = *(sp++);
@@ -366,9 +331,11 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
*(dp++) = save;
}
}
- /* This converts from AARRGGBB to RRGGBBAA */
+
+#ifdef PNG_WRITE_16BIT_SUPPORTED
else
{
+ /* This converts from AARRGGBB to RRGGBBAA */
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
@@ -388,12 +355,14 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
*(dp++) = save[1];
}
}
+#endif /* WRITE_16BIT */
}
+
else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
{
- /* This converts from AG to GA */
if (row_info->bit_depth == 8)
{
+ /* This converts from AG to GA */
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
@@ -405,9 +374,11 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
*(dp++) = save;
}
}
- /* This converts from AAGG to GGAA */
+
+#ifdef PNG_WRITE_16BIT_SUPPORTED
else
{
+ /* This converts from AAGG to GGAA */
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
@@ -423,29 +394,28 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
*(dp++) = save[1];
}
}
+#endif /* WRITE_16BIT */
}
}
}
#endif
#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
-void /* PRIVATE */
+static void
png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_write_invert_alpha");
-#ifdef PNG_USELESS_TESTS_SUPPORTED
- if (row != NULL && row_info != NULL)
-#endif
{
if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
{
- /* This inverts the alpha channel in RGBA */
if (row_info->bit_depth == 8)
{
+ /* This inverts the alpha channel in RGBA */
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
+
for (i = 0, sp = dp = row; i < row_width; i++)
{
/* Does nothing
@@ -454,12 +424,14 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
*(dp++) = *(sp++);
*/
sp+=3; dp = sp;
- *(dp++) = (png_byte)(255 - *(sp++));
+ *dp = (png_byte)(255 - *(sp++));
}
}
- /* This inverts the alpha channel in RRGGBBAA */
+
+#ifdef PNG_WRITE_16BIT_SUPPORTED
else
{
+ /* This inverts the alpha channel in RRGGBBAA */
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
@@ -476,15 +448,17 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
*/
sp+=6; dp = sp;
*(dp++) = (png_byte)(255 - *(sp++));
- *(dp++) = (png_byte)(255 - *(sp++));
+ *dp = (png_byte)(255 - *(sp++));
}
}
+#endif /* WRITE_16BIT */
}
+
else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
{
- /* This inverts the alpha channel in GA */
if (row_info->bit_depth == 8)
{
+ /* This inverts the alpha channel in GA */
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
@@ -495,9 +469,11 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
*(dp++) = (png_byte)(255 - *(sp++));
}
}
- /* This inverts the alpha channel in GGAA */
+
+#ifdef PNG_WRITE_16BIT_SUPPORTED
else
{
+ /* This inverts the alpha channel in GGAA */
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
@@ -510,73 +486,91 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
*/
sp+=2; dp = sp;
*(dp++) = (png_byte)(255 - *(sp++));
- *(dp++) = (png_byte)(255 - *(sp++));
+ *dp = (png_byte)(255 - *(sp++));
}
}
+#endif /* WRITE_16BIT */
}
}
}
#endif
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-/* Undoes intrapixel differencing */
+/* Transform the data according to the user's wishes. The order of
+ * transformations is significant.
+ */
void /* PRIVATE */
-png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
+png_do_write_transformations(png_structrp png_ptr, png_row_infop row_info)
{
- png_debug(1, "in png_do_write_intrapixel");
+ png_debug(1, "in png_do_write_transformations");
- if (
-#ifdef PNG_USELESS_TESTS_SUPPORTED
- row != NULL && row_info != NULL &&
+ if (png_ptr == NULL)
+ return;
+
+#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
+ if ((png_ptr->transformations & PNG_USER_TRANSFORM) != 0)
+ if (png_ptr->write_user_transform_fn != NULL)
+ (*(png_ptr->write_user_transform_fn)) /* User write transform
+ function */
+ (png_ptr, /* png_ptr */
+ row_info, /* row_info: */
+ /* png_uint_32 width; width of row */
+ /* png_size_t rowbytes; number of bytes in row */
+ /* png_byte color_type; color type of pixels */
+ /* png_byte bit_depth; bit depth of samples */
+ /* png_byte channels; number of channels (1-4) */
+ /* png_byte pixel_depth; bits per pixel (depth*channels) */
+ png_ptr->row_buf + 1); /* start of pixel data for row */
#endif
- (row_info->color_type & PNG_COLOR_MASK_COLOR))
- {
- int bytes_per_pixel;
- png_uint_32 row_width = row_info->width;
- if (row_info->bit_depth == 8)
- {
- png_bytep rp;
- png_uint_32 i;
- if (row_info->color_type == PNG_COLOR_TYPE_RGB)
- bytes_per_pixel = 3;
- else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
- bytes_per_pixel = 4;
- else
- return;
+#ifdef PNG_WRITE_FILLER_SUPPORTED
+ if ((png_ptr->transformations & PNG_FILLER) != 0)
+ png_do_strip_channel(row_info, png_ptr->row_buf + 1,
+ !(png_ptr->flags & PNG_FLAG_FILLER_AFTER));
+#endif
- for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
- {
- *(rp) = (png_byte)((*rp - *(rp+1))&0xff);
- *(rp+2) = (png_byte)((*(rp+2) - *(rp+1))&0xff);
- }
- }
- else if (row_info->bit_depth == 16)
- {
- png_bytep rp;
- png_uint_32 i;
+#ifdef PNG_WRITE_PACKSWAP_SUPPORTED
+ if ((png_ptr->transformations & PNG_PACKSWAP) != 0)
+ png_do_packswap(row_info, png_ptr->row_buf + 1);
+#endif
- if (row_info->color_type == PNG_COLOR_TYPE_RGB)
- bytes_per_pixel = 6;
- else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
- bytes_per_pixel = 8;
- else
- return;
+#ifdef PNG_WRITE_PACK_SUPPORTED
+ if ((png_ptr->transformations & PNG_PACK) != 0)
+ png_do_pack(row_info, png_ptr->row_buf + 1,
+ (png_uint_32)png_ptr->bit_depth);
+#endif
- for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
- {
- png_uint_32 s0 = (*(rp ) << 8) | *(rp+1);
- png_uint_32 s1 = (*(rp+2) << 8) | *(rp+3);
- png_uint_32 s2 = (*(rp+4) << 8) | *(rp+5);
- png_uint_32 red = (png_uint_32)((s0 - s1) & 0xffffL);
- png_uint_32 blue = (png_uint_32)((s2 - s1) & 0xffffL);
- *(rp ) = (png_byte)((red >> 8) & 0xff);
- *(rp+1) = (png_byte)(red & 0xff);
- *(rp+4) = (png_byte)((blue >> 8) & 0xff);
- *(rp+5) = (png_byte)(blue & 0xff);
- }
- }
- }
+#ifdef PNG_WRITE_SWAP_SUPPORTED
+# ifdef PNG_16BIT_SUPPORTED
+ if ((png_ptr->transformations & PNG_SWAP_BYTES) != 0)
+ png_do_swap(row_info, png_ptr->row_buf + 1);
+# endif
+#endif
+
+#ifdef PNG_WRITE_SHIFT_SUPPORTED
+ if ((png_ptr->transformations & PNG_SHIFT) != 0)
+ png_do_shift(row_info, png_ptr->row_buf + 1,
+ &(png_ptr->shift));
+#endif
+
+#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
+ if ((png_ptr->transformations & PNG_SWAP_ALPHA) != 0)
+ png_do_write_swap_alpha(row_info, png_ptr->row_buf + 1);
+#endif
+
+#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
+ if ((png_ptr->transformations & PNG_INVERT_ALPHA) != 0)
+ png_do_write_invert_alpha(row_info, png_ptr->row_buf + 1);
+#endif
+
+#ifdef PNG_WRITE_BGR_SUPPORTED
+ if ((png_ptr->transformations & PNG_BGR) != 0)
+ png_do_bgr(row_info, png_ptr->row_buf + 1);
+#endif
+
+#ifdef PNG_WRITE_INVERT_SUPPORTED
+ if ((png_ptr->transformations & PNG_INVERT_MONO) != 0)
+ png_do_invert(row_info, png_ptr->row_buf + 1);
+#endif
}
-#endif /* PNG_MNG_FEATURES_SUPPORTED */
-#endif /* PNG_WRITE_SUPPORTED */
+#endif /* WRITE_TRANSFORMS */
+#endif /* WRITE */
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