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Diffstat (limited to 'thirdparty/libpng/pngset.c')
-rw-r--r--thirdparty/libpng/pngset.c158
1 files changed, 152 insertions, 6 deletions
diff --git a/thirdparty/libpng/pngset.c b/thirdparty/libpng/pngset.c
index 7cf54d9248..a281db58ae 100644
--- a/thirdparty/libpng/pngset.c
+++ b/thirdparty/libpng/pngset.c
@@ -1,10 +1,10 @@
/* pngset.c - storage of image information into info struct
*
- * Last changed in libpng 1.6.35 [July 15, 2018]
+ * Copyright (c) 2018 Cosmin Truta
* Copyright (c) 1998-2018 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.)
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -137,7 +137,7 @@ png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X,
#ifdef PNG_eXIf_SUPPORTED
void PNGAPI
png_set_eXIf(png_const_structrp png_ptr, png_inforp info_ptr,
- const png_bytep eXIf_buf)
+ png_bytep eXIf_buf)
{
png_warning(png_ptr, "png_set_eXIf does not work; use png_set_eXIf_1");
PNG_UNUSED(info_ptr)
@@ -146,7 +146,7 @@ png_set_eXIf(png_const_structrp png_ptr, png_inforp info_ptr,
void PNGAPI
png_set_eXIf_1(png_const_structrp png_ptr, png_inforp info_ptr,
- const png_uint_32 num_exif, const png_bytep eXIf_buf)
+ png_uint_32 num_exif, png_bytep eXIf_buf)
{
int i;
@@ -288,6 +288,11 @@ png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr,
info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
+
+#ifdef PNG_APNG_SUPPORTED
+ /* for non-animated png. this may be overwritten from an acTL chunk later */
+ info_ptr->num_frames = 1;
+#endif
}
#ifdef PNG_oFFs_SUPPORTED
@@ -1158,6 +1163,147 @@ png_set_sPLT(png_const_structrp png_ptr,
}
#endif /* sPLT */
+#ifdef PNG_APNG_SUPPORTED
+png_uint_32 PNGAPI
+png_set_acTL(png_structp png_ptr, png_infop info_ptr,
+ png_uint_32 num_frames, png_uint_32 num_plays)
+{
+ png_debug1(1, "in %s storage function", "acTL");
+
+ if (png_ptr == NULL || info_ptr == NULL)
+ {
+ png_warning(png_ptr,
+ "Call to png_set_acTL() with NULL png_ptr "
+ "or info_ptr ignored");
+ return (0);
+ }
+ if (num_frames == 0)
+ {
+ png_warning(png_ptr,
+ "Ignoring attempt to set acTL with num_frames zero");
+ return (0);
+ }
+ if (num_frames > PNG_UINT_31_MAX)
+ {
+ png_warning(png_ptr,
+ "Ignoring attempt to set acTL with num_frames > 2^31-1");
+ return (0);
+ }
+ if (num_plays > PNG_UINT_31_MAX)
+ {
+ png_warning(png_ptr,
+ "Ignoring attempt to set acTL with num_plays "
+ "> 2^31-1");
+ return (0);
+ }
+
+ info_ptr->num_frames = num_frames;
+ info_ptr->num_plays = num_plays;
+
+ info_ptr->valid |= PNG_INFO_acTL;
+
+ return (1);
+}
+
+/* delay_num and delay_den can hold any 16-bit values including zero */
+png_uint_32 PNGAPI
+png_set_next_frame_fcTL(png_structp png_ptr, png_infop info_ptr,
+ png_uint_32 width, png_uint_32 height,
+ png_uint_32 x_offset, png_uint_32 y_offset,
+ png_uint_16 delay_num, png_uint_16 delay_den,
+ png_byte dispose_op, png_byte blend_op)
+{
+ png_debug1(1, "in %s storage function", "fcTL");
+
+ if (png_ptr == NULL || info_ptr == NULL)
+ {
+ png_warning(png_ptr,
+ "Call to png_set_fcTL() with NULL png_ptr or info_ptr "
+ "ignored");
+ return (0);
+ }
+
+ png_ensure_fcTL_is_valid(png_ptr, width, height, x_offset, y_offset,
+ delay_num, delay_den, dispose_op, blend_op);
+
+ if (blend_op == PNG_BLEND_OP_OVER)
+ {
+ if (!(png_ptr->color_type & PNG_COLOR_MASK_ALPHA) &&
+ !(png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
+ {
+ png_warning(png_ptr, "PNG_BLEND_OP_OVER is meaningless "
+ "and wasteful for opaque images, ignored");
+ blend_op = PNG_BLEND_OP_SOURCE;
+ }
+ }
+
+ info_ptr->next_frame_width = width;
+ info_ptr->next_frame_height = height;
+ info_ptr->next_frame_x_offset = x_offset;
+ info_ptr->next_frame_y_offset = y_offset;
+ info_ptr->next_frame_delay_num = delay_num;
+ info_ptr->next_frame_delay_den = delay_den;
+ info_ptr->next_frame_dispose_op = dispose_op;
+ info_ptr->next_frame_blend_op = blend_op;
+
+ info_ptr->valid |= PNG_INFO_fcTL;
+
+ return (1);
+}
+
+void /* PRIVATE */
+png_ensure_fcTL_is_valid(png_structp png_ptr,
+ png_uint_32 width, png_uint_32 height,
+ png_uint_32 x_offset, png_uint_32 y_offset,
+ png_uint_16 delay_num, png_uint_16 delay_den,
+ png_byte dispose_op, png_byte blend_op)
+{
+ if (width == 0 || width > PNG_UINT_31_MAX)
+ png_error(png_ptr, "invalid width in fcTL (> 2^31-1)");
+ if (height == 0 || height > PNG_UINT_31_MAX)
+ png_error(png_ptr, "invalid height in fcTL (> 2^31-1)");
+ if (x_offset > PNG_UINT_31_MAX)
+ png_error(png_ptr, "invalid x_offset in fcTL (> 2^31-1)");
+ if (y_offset > PNG_UINT_31_MAX)
+ png_error(png_ptr, "invalid y_offset in fcTL (> 2^31-1)");
+ if (width + x_offset > png_ptr->first_frame_width ||
+ height + y_offset > png_ptr->first_frame_height)
+ png_error(png_ptr, "dimensions of a frame are greater than"
+ "the ones in IHDR");
+
+ if (dispose_op != PNG_DISPOSE_OP_NONE &&
+ dispose_op != PNG_DISPOSE_OP_BACKGROUND &&
+ dispose_op != PNG_DISPOSE_OP_PREVIOUS)
+ png_error(png_ptr, "invalid dispose_op in fcTL");
+
+ if (blend_op != PNG_BLEND_OP_SOURCE &&
+ blend_op != PNG_BLEND_OP_OVER)
+ png_error(png_ptr, "invalid blend_op in fcTL");
+
+ PNG_UNUSED(delay_num)
+ PNG_UNUSED(delay_den)
+}
+
+png_uint_32 PNGAPI
+png_set_first_frame_is_hidden(png_structp png_ptr, png_infop info_ptr,
+ png_byte is_hidden)
+{
+ png_debug(1, "in png_first_frame_is_hidden()");
+
+ if (png_ptr == NULL)
+ return 0;
+
+ if (is_hidden)
+ png_ptr->apng_flags |= PNG_FIRST_FRAME_HIDDEN;
+ else
+ png_ptr->apng_flags &= ~PNG_FIRST_FRAME_HIDDEN;
+
+ PNG_UNUSED(info_ptr)
+
+ return 1;
+}
+#endif /* PNG_APNG_SUPPORTED */
+
#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
static png_byte
check_location(png_const_structrp png_ptr, int location)
@@ -1399,7 +1545,7 @@ png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
/* Ignore all unknown chunks and all chunks recognized by
* libpng except for IHDR, PLTE, tRNS, IDAT, and IEND
*/
- static PNG_CONST png_byte chunks_to_ignore[] = {
+ static const png_byte chunks_to_ignore[] = {
98, 75, 71, 68, '\0', /* bKGD */
99, 72, 82, 77, '\0', /* cHRM */
101, 88, 73, 102, '\0', /* eXIf */
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-16 13:02:42 +0000