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PNG_FORMAT_RGB and PNG_COLOR_TYPE_RGB both evaluate to 2, but PNG_FORMAT_RGBA evaluates to 3 while PNG_COLOR_TYPE_RGBA evaluates to 6; the bit indicating a palette is 1 while the bit indicating alpha is 4.
43 lines
1.7 KiB
C
43 lines
1.7 KiB
C
// Copyright 2021 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "Common/ImageC.h"
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// Since libpng requires use of setjmp, and setjmp interacts poorly with destructors and other C++
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// features, this is in a separate C file.
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// The main purpose of this function is to allow specifying the compression level, which
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// png_image_write_to_memory does not allow. row_pointers is not modified by libpng, but also isn't
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// const for some reason.
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bool SavePNG0(png_structp png_ptr, png_infop info_ptr, int color_type, png_uint_32 width,
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png_uint_32 height, int level, png_voidp io_ptr, png_rw_ptr write_fn,
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png_bytepp row_pointers)
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{
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if (setjmp(png_jmpbuf(png_ptr)) != 0)
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return false;
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png_set_compression_level(png_ptr, level);
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png_set_IHDR(png_ptr, info_ptr, width, height, 8, color_type, PNG_INTERLACE_NONE,
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PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
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png_set_rows(png_ptr, info_ptr, row_pointers);
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png_set_write_fn(png_ptr, io_ptr, write_fn, NULL);
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png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
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return true;
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}
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// pngerror.c says: "Note that the error function MUST NOT return to the calling routine or serious
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// problems will occur. The return method used in the default routine calls
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// longjmp(png_ptr->jmp_buf_ptr, 1)"
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void PngError(png_structp png_ptr, png_const_charp msg)
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{
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struct ErrorHandler* error_logger = (struct ErrorHandler*)png_get_error_ptr(png_ptr);
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error_logger->StoreError(error_logger, msg);
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png_longjmp(png_ptr, 1);
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}
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void PngWarning(png_structp png_ptr, png_const_charp msg)
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{
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struct ErrorHandler* error_logger = (struct ErrorHandler*)png_get_error_ptr(png_ptr);
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error_logger->StoreWarning(error_logger, msg);
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}
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