261 lines
7.0 KiB
C++
261 lines
7.0 KiB
C++
/* Copyright (c) 2010 Wildfire Games
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* PNG codec using libpng.
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*/
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#include "precompiled.h"
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#include "lib/external_libraries/png.h"
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#include "lib/byte_order.h"
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#include "tex_codec.h"
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#include "lib/timer.h"
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#if MSC_VERSION
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// squelch "dtor / setjmp interaction" warnings.
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// all attempts to resolve the underlying problem failed; apparently
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// the warning is generated if setjmp is used at all in C++ mode.
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// (png_*_impl have no code that would trigger ctors/dtors, nor are any
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// called in their prolog/epilog code).
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# pragma warning(disable: 4611)
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#endif // MSC_VERSION
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//-----------------------------------------------------------------------------
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//
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//-----------------------------------------------------------------------------
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// pass data from PNG file in memory to libpng
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static void io_read(png_struct* png_ptr, u8* data, png_size_t length)
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{
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DynArray* da = (DynArray*)png_get_io_ptr(png_ptr);
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if(da_read(da, data, length) != 0)
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png_error(png_ptr, "io_read failed");
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}
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// write libpng output to PNG file
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static void io_write(png_struct* png_ptr, u8* data, png_size_t length)
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{
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DynArray* da = (DynArray*)png_get_io_ptr(png_ptr);
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if(da_append(da, data, length) != 0)
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png_error(png_ptr, "io_write failed");
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}
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static void io_flush(png_structp UNUSED(png_ptr))
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{
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}
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//-----------------------------------------------------------------------------
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static LibError png_transform(Tex* UNUSED(t), size_t UNUSED(transforms))
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{
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return INFO::TEX_CODEC_CANNOT_HANDLE;
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}
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// note: it's not worth combining png_encode and png_decode, due to
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// libpng read/write interface differences (grr).
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// split out of png_decode to simplify resource cleanup and avoid
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// "dtor / setjmp interaction" warning.
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static LibError png_decode_impl(DynArray* da, png_structp png_ptr, png_infop info_ptr, Tex* t)
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{
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png_set_read_fn(png_ptr, da, io_read);
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// read header and determine format
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png_read_info(png_ptr, info_ptr);
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png_uint_32 w, h;
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int bit_depth, colour_type;
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png_get_IHDR(png_ptr, info_ptr, &w, &h, &bit_depth, &colour_type, 0, 0, 0);
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const size_t pitch = png_get_rowbytes(png_ptr, info_ptr);
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const u32 bpp = (u32)(pitch/w * 8);
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size_t flags = 0;
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if(bpp == 32)
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flags |= TEX_ALPHA;
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if(colour_type == PNG_COLOR_TYPE_GRAY)
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flags |= TEX_GREY;
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// make sure format is acceptable
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if(bit_depth != 8)
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WARN_RETURN(ERR::TEX_NOT_8BIT_PRECISION);
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if(colour_type & PNG_COLOR_MASK_PALETTE)
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WARN_RETURN(ERR::TEX_INVALID_COLOR_TYPE);
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const size_t img_size = pitch * h;
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shared_ptr<u8> data = io_Allocate(img_size);
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shared_ptr<RowPtr> rows = tex_codec_alloc_rows(data.get(), h, pitch, TEX_TOP_DOWN, 0);
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png_read_image(png_ptr, (png_bytepp)rows.get());
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png_read_end(png_ptr, info_ptr);
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// success; make sure all data was consumed.
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debug_assert(da->pos == da->cur_size);
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// store image info
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t->data = data;
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t->dataSize = img_size;
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t->ofs = 0;
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t->w = w;
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t->h = h;
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t->bpp = bpp;
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t->flags = flags;
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return INFO::OK;
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}
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// split out of png_encode to simplify resource cleanup and avoid
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// "dtor / setjmp interaction" warning.
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static LibError png_encode_impl(Tex* t, png_structp png_ptr, png_infop info_ptr, DynArray* da)
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{
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const png_uint_32 w = (png_uint_32)t->w, h = (png_uint_32)t->h;
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const size_t pitch = w * t->bpp / 8;
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int colour_type;
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switch(t->flags & (TEX_GREY|TEX_ALPHA))
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{
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case TEX_GREY|TEX_ALPHA:
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colour_type = PNG_COLOR_TYPE_GRAY_ALPHA;
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break;
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case TEX_GREY:
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colour_type = PNG_COLOR_TYPE_GRAY;
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break;
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case TEX_ALPHA:
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colour_type = PNG_COLOR_TYPE_RGB_ALPHA;
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break;
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default:
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colour_type = PNG_COLOR_TYPE_RGB;
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break;
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}
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png_set_write_fn(png_ptr, da, io_write, io_flush);
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png_set_IHDR(png_ptr, info_ptr, w, h, 8, colour_type,
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PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
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u8* data = tex_get_data(t);
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shared_ptr<RowPtr> rows = tex_codec_alloc_rows(data, h, pitch, t->flags, TEX_TOP_DOWN);
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// PNG is native RGB.
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const int png_transforms = (t->flags & TEX_BGR)? PNG_TRANSFORM_BGR : PNG_TRANSFORM_IDENTITY;
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png_set_rows(png_ptr, info_ptr, (png_bytepp)rows.get());
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png_write_png(png_ptr, info_ptr, png_transforms, 0);
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return INFO::OK;
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}
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static bool png_is_hdr(const u8* file)
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{
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// don't use png_sig_cmp, so we don't pull in libpng for
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// this check alone (it might not actually be used).
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return *(u32*)file == FOURCC('\x89','P','N','G');
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}
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static bool png_is_ext(const std::wstring& extension)
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{
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return !wcscasecmp(extension.c_str(), L".png");
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}
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static size_t png_hdr_size(const u8* UNUSED(file))
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{
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return 0; // libpng returns decoded image data; no header
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}
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TIMER_ADD_CLIENT(tc_png_decode);
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// limitation: palette images aren't supported
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static LibError png_decode(DynArray* RESTRICT da, Tex* RESTRICT t)
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{
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TIMER_ACCRUE(tc_png_decode);
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LibError ret = ERR::FAIL;
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png_infop info_ptr = 0;
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// allocate PNG structures; use default stderr and longjmp error handlers
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png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
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if(!png_ptr)
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WARN_RETURN(ERR::FAIL);
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info_ptr = png_create_info_struct(png_ptr);
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if(!info_ptr)
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goto fail;
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// setup error handling
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if(setjmp(png_jmpbuf(png_ptr)))
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{
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// libpng longjmps here after an error
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goto fail;
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}
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ret = png_decode_impl(da, png_ptr, info_ptr, t);
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fail:
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png_destroy_read_struct(&png_ptr, &info_ptr, 0);
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return ret;
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}
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// limitation: palette images aren't supported
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static LibError png_encode(Tex* RESTRICT t, DynArray* RESTRICT da)
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{
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LibError ret = ERR::FAIL;
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png_infop info_ptr = 0;
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// allocate PNG structures; use default stderr and longjmp error handlers
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png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
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if(!png_ptr)
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WARN_RETURN(ERR::FAIL);
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info_ptr = png_create_info_struct(png_ptr);
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if(!info_ptr)
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goto fail;
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// setup error handling
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if(setjmp(png_jmpbuf(png_ptr)))
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{
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// libpng longjmps here after an error
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goto fail;
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}
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ret = png_encode_impl(t, png_ptr, info_ptr, da);
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// shared cleanup
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fail:
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png_destroy_write_struct(&png_ptr, &info_ptr);
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return ret;
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}
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TEX_CODEC_REGISTER(png);
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