janwas
1c1200a049
- add translators from errno and GetLastError to LibError - clarified return values of callbacks (they must return INFO_CB_CONTINUE to continue) - this exposed a few bugs in error handling chains (returning incorrect values); also reduced say-nothing instances of return -1. - move CHECK_ERR etc. macros to lib_error This was SVN commit r3229.
644 lines
18 KiB
C++
644 lines
18 KiB
C++
#include "precompiled.h"
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extern "C" {
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// this is not a core library module, so it doesn't define JPEG_INTERNALS
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#include "jpeglib.h"
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#include "jerror.h"
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}
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#include "lib.h"
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#include "lib/res/res.h"
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#include "tex_codec.h"
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#include <setjmp.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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// pull in the appropriate debug/release library
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# ifdef NDEBUG
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# pragma comment(lib, "jpeg-6b.lib")
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# else
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# pragma comment(lib, "jpeg-6bd.lib")
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# endif // #ifdef NDEBUG
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#endif // #ifdef MSC_VERSION
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/* IMPORTANT: we assume that JOCTET is 8 bits. */
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cassert(sizeof(JOCTET) == 1 && CHAR_BIT == 8);
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//-----------------------------------------------------------------------------
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// mem source manager
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//-----------------------------------------------------------------------------
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/* Expanded data source object for memory input */
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typedef struct
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{
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struct jpeg_source_mgr pub; /* public fields */
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DynArray* da;
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}
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SrcMgr;
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typedef SrcMgr* SrcPtr;
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/*
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* Initialize source --- called by jpeg_read_header
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* before any data is actually read.
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*/
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METHODDEF(void) src_init(j_decompress_ptr UNUSED(cinfo))
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{
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}
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/*
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* Fill the input buffer --- called whenever buffer is emptied.
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*
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* In typical applications, this should read fresh data into the buffer
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* (ignoring the current state of next_input_byte & bytes_in_buffer),
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* reset the pointer & count to the start of the buffer, and return TRUE
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* indicating that the buffer has been reloaded. It is not necessary to
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* fill the buffer entirely, only to obtain at least one more byte.
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*
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* There is no such thing as an EOF return. If the end of the file has been
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* reached, the routine has a choice of ERREXIT() or inserting fake data into
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* the buffer. In most cases, generating a warning message and inserting a
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* fake EOI marker is the best course of action --- this will allow the
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* decompressor to output however much of the image is there. However,
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* the resulting error message is misleading if the real problem is an empty
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* input file, so we handle that case specially.
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*/
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METHODDEF(boolean) src_fill_buffer(j_decompress_ptr cinfo)
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{
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SrcPtr src = (SrcPtr)cinfo->src;
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static const JOCTET eoi[2] = { 0xFF, JPEG_EOI };
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/*
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* since jpeg_mem_src fills the buffer with everything we've got,
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* jpeg is trying to read beyond end of buffer. return a fake EOI marker.
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* note: don't modify input buffer: it might be read-only.
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*/
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WARNMS(cinfo, JWRN_JPEG_EOF);
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src->pub.next_input_byte = eoi;
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src->pub.bytes_in_buffer = 2;
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return TRUE;
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}
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/*
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* Skip data --- used to skip over a potentially large amount of
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* uninteresting data (such as an APPn marker).
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*/
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METHODDEF(void) src_skip_data(j_decompress_ptr cinfo, long num_bytes)
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{
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SrcPtr src = (SrcPtr)cinfo->src;
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size_t skip_count = (size_t)num_bytes;
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/* docs say non-positive num_byte skips should be ignored */
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if(num_bytes <= 0)
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return;
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/*
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* just subtract bytes available in buffer,
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* making sure we don't underflow the size_t.
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* note: if we skip to or beyond end of buffer,
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* bytes_in_buffer = 0 => fill_input_buffer called => abort.
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*/
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if(skip_count > src->pub.bytes_in_buffer)
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skip_count = src->pub.bytes_in_buffer;
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src->pub.bytes_in_buffer -= skip_count;
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src->pub.next_input_byte += skip_count;
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}
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/*
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* An additional method that can be provided by data source modules is the
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* resync_to_restart method for error recovery in the presence of RST markers.
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* For the moment, this source module just uses the default resync method
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* provided by the JPEG library. That method assumes that no backtracking
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* is possible.
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*/
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/*
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* Terminate source --- called by jpeg_finish_decompress
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* after all data has been read. Often a no-op.
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*
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* NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
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* application must deal with any cleanup that should happen even
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* for error exit.
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*/
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METHODDEF(void) src_term(j_decompress_ptr UNUSED(cinfo))
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{
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/*
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* no-op (we don't own the buffer and shouldn't,
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* to make possible multiple images in a source).
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*/
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}
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/*
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* Prepare for input from a buffer.
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* The caller is responsible for freeing it after finishing decompression.
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*/
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GLOBAL(void) src_prepare(j_decompress_ptr cinfo, DynArray* da)
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{
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SrcPtr src;
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const u8* p = da->base;
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const size_t size = da->cur_size;
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/* Treat 0-length buffer as fatal error */
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if(size == 0)
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ERREXIT(cinfo, JERR_INPUT_EMPTY);
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/*
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* The source object is made permanent so that
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* a series of JPEG images can be read from the same file
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* by calling jpeg_mem_src only before the first one.
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* This makes it unsafe to use this manager and a different source
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* manager serially with the same JPEG object. Caveat programmer.
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*/
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/* first time for this JPEG object? */
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if(!cinfo->src)
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cinfo->src = (struct jpeg_source_mgr*)
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(*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_PERMANENT,
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sizeof(SrcMgr));
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/* (takes care of raising error if out of memory) */
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src = (SrcPtr)cinfo->src;
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src->pub.init_source = src_init;
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src->pub.fill_input_buffer = src_fill_buffer;
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src->pub.skip_input_data = src_skip_data;
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src->pub.resync_to_restart = jpeg_resync_to_restart; /* default */
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src->pub.term_source = src_term;
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/*
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* fill buffer with everything we have.
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* if fill_input_buffer is called, the buffer was overrun.
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*/
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src->pub.bytes_in_buffer = size;
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src->pub.next_input_byte = (JOCTET*)p;
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}
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//-----------------------------------------------------------------------------
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// mem destination manager
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//-----------------------------------------------------------------------------
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/* Expanded data destination object for memory output */
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typedef struct {
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struct jpeg_destination_mgr pub; /* public fields */
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DynArray* da;
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} DstMgr;
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typedef DstMgr* DstPtr;
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// this affects how often dst_empty_output_buffer is called (which
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// efficiently expands the DynArray) and how much tail memory we waste
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// (not an issue because it is freed immediately after compression).
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#define OUTPUT_BUF_SIZE 64*KiB /* choose an efficiently writeable size */
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// note: can't call dst_empty_output_buffer from dst_init or vice versa
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// because only the former must advance da->pos.
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static void make_room_in_buffer(j_compress_ptr cinfo)
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{
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DstPtr dst = (DstPtr)cinfo->dest;
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DynArray* da = dst->da;
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void* start = da->base + da->cur_size;
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if(da_set_size(da, da->cur_size+OUTPUT_BUF_SIZE) != 0)
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ERREXIT(cinfo, JERR_FILE_WRITE);
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dst->pub.next_output_byte = (JOCTET*)start;
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dst->pub.free_in_buffer = OUTPUT_BUF_SIZE;
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}
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/*
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* Initialize destination --- called by jpeg_start_compress
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* before any data is actually written.
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*/
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METHODDEF(void) dst_init(j_compress_ptr cinfo)
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{
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make_room_in_buffer(cinfo);
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}
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/*
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* Empty the output buffer --- called whenever buffer fills up.
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*
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* In typical applications, this should write the entire output buffer
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* (ignoring the current state of next_output_byte & free_in_buffer),
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* reset the pointer & count to the start of the buffer, and return TRUE
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* indicating that the buffer has been dumped.
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*
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* <snip comments on suspended IO>
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*/
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METHODDEF(boolean) dst_empty_output_buffer(j_compress_ptr cinfo)
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{
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DstPtr dst = (DstPtr)cinfo->dest;
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DynArray* da = dst->da;
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// writing out OUTPUT_BUF_SIZE-dst->pub.free_in_buffer bytes
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// sounds reasonable, but makes for broken output.
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da->pos += OUTPUT_BUF_SIZE;
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make_room_in_buffer(cinfo);
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return TRUE; // not suspended
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}
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/*
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* Terminate destination --- called by jpeg_finish_compress
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* after all data has been written. Usually needs to flush buffer.
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*
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* NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
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* application must deal with any cleanup that should happen even
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* for error exit.
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*/
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METHODDEF(void) dst_term(j_compress_ptr cinfo)
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{
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DstPtr dst = (DstPtr)cinfo->dest;
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DynArray* da = dst->da;
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// account for nbytes left in buffer
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da->pos += OUTPUT_BUF_SIZE - dst->pub.free_in_buffer;
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}
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/*
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* Prepare for output to a buffer.
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* The caller is responsible for allocating and writing out to disk after
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* compression is complete.
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*/
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GLOBAL(void) dst_prepare(j_compress_ptr cinfo, DynArray* da)
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{
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/* The destination object is made permanent so that multiple JPEG images
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* can be written to the same file without re-executing dst_prepare.
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* This makes it dangerous to use this manager and a different destination
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* manager serially with the same JPEG object, because their private object
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* sizes may be different. Caveat programmer.
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*/
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if (cinfo->dest == NULL) { /* first time for this JPEG object? */
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cinfo->dest = (struct jpeg_destination_mgr*)(*cinfo->mem->alloc_small)
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((j_common_ptr)cinfo, JPOOL_PERMANENT, sizeof(DstMgr));
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}
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DstPtr dst = (DstPtr)cinfo->dest;
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dst->pub.init_destination = dst_init;
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dst->pub.empty_output_buffer = dst_empty_output_buffer;
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dst->pub.term_destination = dst_term;
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dst->da = da;
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}
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//-----------------------------------------------------------------------------
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// error handler, shared by jpg_(en|de)code
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//-----------------------------------------------------------------------------
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// the JPEG library's standard error handler (jerror.c) is divided into
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// several "methods" which we can override individually. This allows
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// adjusting the behavior without duplicating a lot of code, which may
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// have to be updated with each future release.
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//
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// we here override error_exit to return control to the library's caller
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// (i.e. jpg_(de|en)code) when a fatal error occurs, rather than calling exit.
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//
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// the replacement error_exit does a longjmp back to the caller's
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// setjmp return point. it needs access to the jmp_buf,
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// so we store it in a "subclass" of jpeg_error_mgr.
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struct JpgErrorMgr
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{
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struct jpeg_error_mgr pub; // "public" fields
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// jump here (back to JPEG lib caller) on error
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jmp_buf call_site;
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// description of first error encountered; must store in JPEG context
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// for thread safety. initialized in setup_err_mgr.
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char msg[JMSG_LENGTH_MAX];
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JpgErrorMgr(j_common_ptr cinfo);
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};
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METHODDEF(void) err_error_exit(j_common_ptr cinfo)
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{
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// get subclass
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JpgErrorMgr* err_mgr = (JpgErrorMgr*)cinfo->err;
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// "output" error message (i.e. store in JpgErrorMgr;
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// call_site is responsible for displaying it via debug_printf)
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(*cinfo->err->output_message)(cinfo);
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// jump back to call site, i.e. jpg_(de|en)code
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longjmp(err_mgr->call_site, 1);
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}
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// stores message in JpgErrorMgr for later output by jpg_(de|en)code.
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// note: don't display message here, so the caller can
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// add some context (whether encoding or decoding, and filename).
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METHODDEF(void) err_output_message(j_common_ptr cinfo)
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{
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// get subclass
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JpgErrorMgr* err_mgr = (JpgErrorMgr*)cinfo->err;
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// this context already had an error message; don't overwrite it.
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// (subsequent errors probably aren't related to the real problem).
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// note: was set to '\0' by ctor.
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if(err_mgr->msg[0] != '\0')
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return;
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// generate the message and store it
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(*cinfo->err->format_message)(cinfo, err_mgr->msg);
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}
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JpgErrorMgr::JpgErrorMgr(j_common_ptr cinfo)
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{
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// fill in pub fields
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jpeg_std_error(&pub);
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// .. and override some methods:
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pub.error_exit = err_error_exit;
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pub.output_message = err_output_message;
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// required for "already have message" check in err_output_message
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msg[0] = '\0';
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// hack: register this error manager with cinfo.
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// must be done before jpeg_create_* in case that fails
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// (unlikely, but possible if out of memory).
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cinfo->err = &pub;
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}
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//-----------------------------------------------------------------------------
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static LibError jpg_transform(Tex* UNUSED(t), uint UNUSED(transforms))
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{
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return ERR_TEX_CODEC_CANNOT_HANDLE;
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}
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// note: jpg_encode and jpg_decode cannot be combined due to
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// libjpg interface differences.
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// we do split them up into interface and impl to simplify
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// resource cleanup and avoid "dtor / setjmp interaction" warnings.
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//
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// rationale for row array: jpeg won't output more than a few
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// scanlines at a time, so we need an output loop anyway. however,
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// passing at least 2..4 rows is more efficient in low-quality modes
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// due to less copying.
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static LibError jpg_decode_impl(DynArray* da,
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jpeg_decompress_struct* cinfo,
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Handle& img_hm, RowArray& rows, Tex* t)
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{
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src_prepare(cinfo, da);
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// ignore return value since:
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// - suspension is not possible with the mem data source
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// - we passed TRUE to raise an error if table-only JPEG file
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(void)jpeg_read_header(cinfo, TRUE);
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// set libjpg output format. we cannot go with the default because
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// Photoshop writes non-standard CMYK files that must be converted to RGB.
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int flags = 0;
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cinfo->out_color_space = JCS_RGB;
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if(cinfo->num_components == 1)
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{
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flags |= TEX_GREY;
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cinfo->out_color_space = JCS_GRAYSCALE;
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}
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// lower quality, but faster
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cinfo->dct_method = JDCT_IFAST;
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cinfo->do_fancy_upsampling = FALSE;
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// ignore return value since suspension is not possible with the
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// mem data source.
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// note: since we've set out_color_space, JPEG will always
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// return an acceptable image format; no need to check.
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(void)jpeg_start_decompress(cinfo);
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// scaled output image dimensions and final bpp are now available.
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int w = cinfo->output_width;
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int h = cinfo->output_height;
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int bpp = cinfo->output_components * 8;
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// alloc destination buffer
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const size_t pitch = w * bpp / 8;
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const size_t img_size = pitch * h; // for allow_rows
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u8* img = (u8*)mem_alloc(img_size, 64*KiB, 0, &img_hm);
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if(!img)
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return ERR_NO_MEM;
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// read rows
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RETURN_ERR(tex_codec_alloc_rows(img, h, pitch, TEX_TOP_DOWN, 0, rows));
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// could use cinfo->output_scanline to keep track of progress,
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// but we need to count lines_left anyway (paranoia).
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JSAMPARRAY row = (JSAMPARRAY)rows;
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JDIMENSION lines_left = h;
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while(lines_left != 0)
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{
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JDIMENSION lines_read = jpeg_read_scanlines(cinfo, row, lines_left);
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row += lines_read;
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lines_left -= lines_read;
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// we've decoded in-place; no need to further process
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}
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// ignore return value since suspension is not possible with the
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// mem data source.
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(void)jpeg_finish_decompress(cinfo);
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LibError ret = ERR_OK;
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if(cinfo->err->num_warnings != 0)
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ret = WARN_TEX_INVALID_DATA;
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// store image info
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// .. transparently switch handles - free the old (compressed)
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// buffer and replace it with the decoded-image memory handle.
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mem_free_h(t->hm); // must come after jpeg_finish_decompress
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t->hm = img_hm;
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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 ret;
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}
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static LibError jpg_encode_impl(Tex* t,
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jpeg_compress_struct* cinfo,
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RowArray& rows, DynArray* da)
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{
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dst_prepare(cinfo, da);
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// describe image format
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// required:
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cinfo->image_width = t->w;
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cinfo->image_height = t->h;
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cinfo->input_components = t->bpp / 8;
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cinfo->in_color_space = (t->bpp == 8)? JCS_GRAYSCALE : JCS_RGB;
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// defaults depend on cinfo->in_color_space already having been set!
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jpeg_set_defaults(cinfo);
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// (add optional settings, e.g. quality, here)
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// TRUE ensures that we will write a complete interchange-JPEG file.
|
|
// don't change unless you are very sure of what you're doing.
|
|
jpeg_start_compress(cinfo, TRUE);
|
|
|
|
// if BGR, convert to RGB.
|
|
WARN_ERR(tex_transform_to(t, t->flags & ~TEX_BGR));
|
|
|
|
const size_t pitch = t->w * t->bpp / 8;
|
|
u8* data = tex_get_data(t);
|
|
RETURN_ERR(tex_codec_alloc_rows(data, t->h, pitch, t->flags, TEX_TOP_DOWN, rows));
|
|
|
|
|
|
// could use cinfo->output_scanline to keep track of progress,
|
|
// but we need to count lines_left anyway (paranoia).
|
|
JSAMPARRAY row = (JSAMPARRAY)rows;
|
|
JDIMENSION lines_left = t->h;
|
|
while(lines_left != 0)
|
|
{
|
|
JDIMENSION lines_read = jpeg_write_scanlines(cinfo, row, lines_left);
|
|
row += lines_read;
|
|
lines_left -= lines_read;
|
|
|
|
// we've decoded in-place; no need to further process
|
|
}
|
|
|
|
jpeg_finish_compress(cinfo);
|
|
|
|
LibError ret = ERR_OK;
|
|
if(cinfo->err->num_warnings != 0)
|
|
ret = WARN_TEX_INVALID_DATA;
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
|
|
static bool jpg_is_hdr(const u8* file)
|
|
{
|
|
// JFIF requires SOI marker at start of stream.
|
|
// we compare single bytes to be endian-safe.
|
|
return (file[0] == 0xff && file[1] == 0xd8);
|
|
}
|
|
|
|
|
|
static bool jpg_is_ext(const char* ext)
|
|
{
|
|
return !stricmp(ext, "jpg") || !stricmp(ext, "jpeg");
|
|
}
|
|
|
|
|
|
static size_t jpg_hdr_size(const u8* UNUSED(file))
|
|
{
|
|
return 0; // libjpg returns decoded image data; no header
|
|
}
|
|
|
|
|
|
static LibError jpg_decode(DynArray* restrict da, Tex* restrict t)
|
|
{
|
|
LibError err;
|
|
|
|
// freed when ret is reached:
|
|
// .. contains the JPEG decompression parameters and pointers to
|
|
// working space (allocated as needed by the JPEG library).
|
|
struct jpeg_decompress_struct cinfo;
|
|
// .. array of pointers to scanlines (see rationale above)
|
|
RowArray rows = 0;
|
|
|
|
// freed when fail is reached:
|
|
Handle img_hm; // decompressed image memory
|
|
|
|
JpgErrorMgr jerr((j_common_ptr)&cinfo);
|
|
if(setjmp(jerr.call_site))
|
|
{
|
|
err = ERR_FAIL;
|
|
goto fail;
|
|
}
|
|
|
|
jpeg_create_decompress(&cinfo);
|
|
|
|
err = jpg_decode_impl(da, &cinfo, img_hm, rows, t);
|
|
if(err < 0)
|
|
goto fail;
|
|
|
|
ret:
|
|
jpeg_destroy_decompress(&cinfo); // releases a "good deal" of memory
|
|
free(rows);
|
|
return err;
|
|
|
|
fail:
|
|
mem_free_h(img_hm);
|
|
goto ret;
|
|
}
|
|
|
|
|
|
// limitation: palette images aren't supported
|
|
static LibError jpg_encode(Tex* restrict t, DynArray* restrict da)
|
|
{
|
|
LibError err;
|
|
|
|
// freed when ret is reached:
|
|
// .. contains the JPEG compression parameters and pointers to
|
|
// working space (allocated as needed by the JPEG library).
|
|
struct jpeg_compress_struct cinfo;
|
|
// .. array of pointers to scanlines (see rationale above)
|
|
RowArray rows = 0;
|
|
|
|
JpgErrorMgr jerr((j_common_ptr)&cinfo);
|
|
if(setjmp(jerr.call_site))
|
|
{
|
|
err = ERR_FAIL;
|
|
goto fail;
|
|
}
|
|
|
|
jpeg_create_compress(&cinfo);
|
|
|
|
err = jpg_encode_impl(t, &cinfo, rows, da);
|
|
if(err < 0)
|
|
goto fail;
|
|
|
|
ret:
|
|
jpeg_destroy_compress(&cinfo); // releases a "good deal" of memory
|
|
free(rows);
|
|
return err;
|
|
|
|
fail:
|
|
// currently no extra cleanup needed
|
|
goto ret;
|
|
}
|
|
|
|
TEX_CODEC_REGISTER(jpg);
|