diff options
Diffstat (limited to 'thirdparty/libpng/pngset.c')
| -rw-r--r-- | thirdparty/libpng/pngset.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/thirdparty/libpng/pngset.c b/thirdparty/libpng/pngset.c index ec75dbe369..a281db58ae 100644 --- a/thirdparty/libpng/pngset.c +++ b/thirdparty/libpng/pngset.c @@ -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) |