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dexed/JuceLibraryCode/modules/juce_graphics/image_formats/juce_JPEGLoader.cpp

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/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2013 - Raw Material Software Ltd.
Permission is granted to use this software under the terms of either:
a) the GPL v2 (or any later version)
b) the Affero GPL v3
Details of these licenses can be found at: www.gnu.org/licenses
JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
------------------------------------------------------------------------------
To release a closed-source product which uses JUCE, commercial licenses are
available: visit www.juce.com for more information.
==============================================================================
*/
#if JUCE_MSVC
#pragma warning (push)
#pragma warning (disable: 4365)
#endif
namespace jpeglibNamespace
{
#if JUCE_INCLUDE_JPEGLIB_CODE || ! defined (JUCE_INCLUDE_JPEGLIB_CODE)
#if JUCE_MINGW
typedef unsigned char boolean;
#endif
#if JUCE_CLANG
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wconversion"
#pragma clang diagnostic ignored "-Wdeprecated-register"
#endif
#define JPEG_INTERNALS
#undef FAR
#include "jpglib/jpeglib.h"
#include "jpglib/jcapimin.c"
#include "jpglib/jcapistd.c"
#include "jpglib/jccoefct.c"
#include "jpglib/jccolor.c"
#undef FIX
#include "jpglib/jcdctmgr.c"
#undef CONST_BITS
#include "jpglib/jchuff.c"
#undef emit_byte
#include "jpglib/jcinit.c"
#include "jpglib/jcmainct.c"
#include "jpglib/jcmarker.c"
#include "jpglib/jcmaster.c"
#include "jpglib/jcomapi.c"
#include "jpglib/jcparam.c"
#include "jpglib/jcphuff.c"
#include "jpglib/jcprepct.c"
#include "jpglib/jcsample.c"
#include "jpglib/jctrans.c"
#include "jpglib/jdapistd.c"
#include "jpglib/jdapimin.c"
#include "jpglib/jdatasrc.c"
#include "jpglib/jdcoefct.c"
#undef FIX
#include "jpglib/jdcolor.c"
#undef FIX
#include "jpglib/jddctmgr.c"
#undef CONST_BITS
#undef ASSIGN_STATE
#include "jpglib/jdhuff.c"
#include "jpglib/jdinput.c"
#include "jpglib/jdmainct.c"
#include "jpglib/jdmarker.c"
#include "jpglib/jdmaster.c"
#undef FIX
#include "jpglib/jdmerge.c"
#undef ASSIGN_STATE
#include "jpglib/jdphuff.c"
#include "jpglib/jdpostct.c"
#undef FIX
#include "jpglib/jdsample.c"
#include "jpglib/jdtrans.c"
#include "jpglib/jfdctflt.c"
#include "jpglib/jfdctint.c"
#undef CONST_BITS
#undef MULTIPLY
#undef FIX_0_541196100
#include "jpglib/jfdctfst.c"
#undef FIX_0_541196100
#include "jpglib/jidctflt.c"
#undef CONST_BITS
#undef FIX_1_847759065
#undef MULTIPLY
#undef DEQUANTIZE
#undef DESCALE
#include "jpglib/jidctfst.c"
#undef CONST_BITS
#undef FIX_1_847759065
#undef MULTIPLY
#undef DEQUANTIZE
#include "jpglib/jidctint.c"
#include "jpglib/jidctred.c"
#include "jpglib/jmemmgr.c"
#include "jpglib/jmemnobs.c"
#include "jpglib/jquant1.c"
#include "jpglib/jquant2.c"
#include "jpglib/jutils.c"
#include "jpglib/transupp.c"
#if JUCE_CLANG
#pragma clang diagnostic pop
#endif
#else
#define JPEG_INTERNALS
#undef FAR
#include <jpeglib.h>
#endif
}
#undef max
#undef min
#if JUCE_MSVC
#pragma warning (pop)
#endif
//==============================================================================
namespace JPEGHelpers
{
using namespace jpeglibNamespace;
#if ! JUCE_MSVC
using jpeglibNamespace::boolean;
#endif
struct JPEGDecodingFailure {};
static void fatalErrorHandler (j_common_ptr) { throw JPEGDecodingFailure(); }
static void silentErrorCallback1 (j_common_ptr) {}
static void silentErrorCallback2 (j_common_ptr, int) {}
static void silentErrorCallback3 (j_common_ptr, char*) {}
static void setupSilentErrorHandler (struct jpeg_error_mgr& err)
{
zerostruct (err);
err.error_exit = fatalErrorHandler;
err.emit_message = silentErrorCallback2;
err.output_message = silentErrorCallback1;
err.format_message = silentErrorCallback3;
err.reset_error_mgr = silentErrorCallback1;
}
//==============================================================================
#if ! JUCE_USING_COREIMAGE_LOADER
static void dummyCallback1 (j_decompress_ptr) {}
static void jpegSkip (j_decompress_ptr decompStruct, long num)
{
decompStruct->src->next_input_byte += num;
num = jmin (num, (long) decompStruct->src->bytes_in_buffer);
decompStruct->src->bytes_in_buffer -= (size_t) num;
}
static boolean jpegFill (j_decompress_ptr)
{
return 0;
}
#endif
//==============================================================================
const int jpegBufferSize = 512;
struct JuceJpegDest : public jpeg_destination_mgr
{
OutputStream* output;
char* buffer;
};
static void jpegWriteInit (j_compress_ptr) {}
static void jpegWriteTerminate (j_compress_ptr cinfo)
{
JuceJpegDest* const dest = static_cast <JuceJpegDest*> (cinfo->dest);
const size_t numToWrite = jpegBufferSize - dest->free_in_buffer;
dest->output->write (dest->buffer, numToWrite);
}
static boolean jpegWriteFlush (j_compress_ptr cinfo)
{
JuceJpegDest* const dest = static_cast <JuceJpegDest*> (cinfo->dest);
const int numToWrite = jpegBufferSize;
dest->next_output_byte = reinterpret_cast <JOCTET*> (dest->buffer);
dest->free_in_buffer = jpegBufferSize;
return (boolean) dest->output->write (dest->buffer, (size_t) numToWrite);
}
}
//==============================================================================
JPEGImageFormat::JPEGImageFormat()
: quality (-1.0f)
{
}
JPEGImageFormat::~JPEGImageFormat() {}
void JPEGImageFormat::setQuality (const float newQuality)
{
quality = newQuality;
}
String JPEGImageFormat::getFormatName() { return "JPEG"; }
bool JPEGImageFormat::usesFileExtension (const File& f) { return f.hasFileExtension ("jpeg;jpg"); }
bool JPEGImageFormat::canUnderstand (InputStream& in)
{
const int bytesNeeded = 10;
uint8 header [bytesNeeded];
return in.read (header, bytesNeeded) == bytesNeeded
&& header[0] == 0xff
&& header[1] == 0xd8
&& header[2] == 0xff;
}
#if JUCE_USING_COREIMAGE_LOADER
Image juce_loadWithCoreImage (InputStream& input);
#endif
Image JPEGImageFormat::decodeImage (InputStream& in)
{
#if JUCE_USING_COREIMAGE_LOADER
return juce_loadWithCoreImage (in);
#else
using namespace jpeglibNamespace;
using namespace JPEGHelpers;
MemoryOutputStream mb;
mb << in;
Image image;
if (mb.getDataSize() > 16)
{
struct jpeg_decompress_struct jpegDecompStruct;
struct jpeg_error_mgr jerr;
setupSilentErrorHandler (jerr);
jpegDecompStruct.err = &jerr;
jpeg_create_decompress (&jpegDecompStruct);
jpegDecompStruct.src = (jpeg_source_mgr*)(jpegDecompStruct.mem->alloc_small)
((j_common_ptr)(&jpegDecompStruct), JPOOL_PERMANENT, sizeof (jpeg_source_mgr));
jpegDecompStruct.src->init_source = dummyCallback1;
jpegDecompStruct.src->fill_input_buffer = jpegFill;
jpegDecompStruct.src->skip_input_data = jpegSkip;
jpegDecompStruct.src->resync_to_restart = jpeg_resync_to_restart;
jpegDecompStruct.src->term_source = dummyCallback1;
jpegDecompStruct.src->next_input_byte = static_cast <const unsigned char*> (mb.getData());
jpegDecompStruct.src->bytes_in_buffer = mb.getDataSize();
try
{
jpeg_read_header (&jpegDecompStruct, TRUE);
jpeg_calc_output_dimensions (&jpegDecompStruct);
const int width = (int) jpegDecompStruct.output_width;
const int height = (int) jpegDecompStruct.output_height;
jpegDecompStruct.out_color_space = JCS_RGB;
JSAMPARRAY buffer
= (*jpegDecompStruct.mem->alloc_sarray) ((j_common_ptr) &jpegDecompStruct,
JPOOL_IMAGE,
(JDIMENSION) width * 3, 1);
if (jpeg_start_decompress (&jpegDecompStruct))
{
image = Image (Image::RGB, width, height, false);
image.getProperties()->set ("originalImageHadAlpha", false);
const bool hasAlphaChan = image.hasAlphaChannel(); // (the native image creator may not give back what we expect)
const Image::BitmapData destData (image, Image::BitmapData::writeOnly);
for (int y = 0; y < height; ++y)
{
jpeg_read_scanlines (&jpegDecompStruct, buffer, 1);
const uint8* src = *buffer;
uint8* dest = destData.getLinePointer (y);
if (hasAlphaChan)
{
for (int i = width; --i >= 0;)
{
((PixelARGB*) dest)->setARGB (0xff, src[0], src[1], src[2]);
((PixelARGB*) dest)->premultiply();
dest += destData.pixelStride;
src += 3;
}
}
else
{
for (int i = width; --i >= 0;)
{
((PixelRGB*) dest)->setARGB (0xff, src[0], src[1], src[2]);
dest += destData.pixelStride;
src += 3;
}
}
}
jpeg_finish_decompress (&jpegDecompStruct);
in.setPosition (((char*) jpegDecompStruct.src->next_input_byte) - (char*) mb.getData());
}
jpeg_destroy_decompress (&jpegDecompStruct);
}
catch (...)
{}
}
return image;
#endif
}
bool JPEGImageFormat::writeImageToStream (const Image& image, OutputStream& out)
{
using namespace jpeglibNamespace;
using namespace JPEGHelpers;
jpeg_compress_struct jpegCompStruct;
zerostruct (jpegCompStruct);
jpeg_create_compress (&jpegCompStruct);
struct jpeg_error_mgr jerr;
setupSilentErrorHandler (jerr);
jpegCompStruct.err = &jerr;
JuceJpegDest dest;
jpegCompStruct.dest = &dest;
dest.output = &out;
HeapBlock <char> tempBuffer (jpegBufferSize);
dest.buffer = tempBuffer;
dest.next_output_byte = (JOCTET*) dest.buffer;
dest.free_in_buffer = jpegBufferSize;
dest.init_destination = jpegWriteInit;
dest.empty_output_buffer = jpegWriteFlush;
dest.term_destination = jpegWriteTerminate;
jpegCompStruct.image_width = (JDIMENSION) image.getWidth();
jpegCompStruct.image_height = (JDIMENSION) image.getHeight();
jpegCompStruct.input_components = 3;
jpegCompStruct.in_color_space = JCS_RGB;
jpegCompStruct.write_JFIF_header = 1;
jpegCompStruct.X_density = 72;
jpegCompStruct.Y_density = 72;
jpeg_set_defaults (&jpegCompStruct);
jpegCompStruct.dct_method = JDCT_FLOAT;
jpegCompStruct.optimize_coding = 1;
if (quality < 0.0f)
quality = 0.85f;
jpeg_set_quality (&jpegCompStruct, jlimit (0, 100, roundToInt (quality * 100.0f)), TRUE);
jpeg_start_compress (&jpegCompStruct, TRUE);
const int strideBytes = (int) (jpegCompStruct.image_width * (unsigned int) jpegCompStruct.input_components);
JSAMPARRAY buffer = (*jpegCompStruct.mem->alloc_sarray) ((j_common_ptr) &jpegCompStruct,
JPOOL_IMAGE, (JDIMENSION) strideBytes, 1);
const Image::BitmapData srcData (image, Image::BitmapData::readOnly);
while (jpegCompStruct.next_scanline < jpegCompStruct.image_height)
{
uint8* dst = *buffer;
if (srcData.pixelFormat == Image::RGB)
{
const uint8* src = srcData.getLinePointer ((int) jpegCompStruct.next_scanline);
for (int i = srcData.width; --i >= 0;)
{
*dst++ = ((const PixelRGB*) src)->getRed();
*dst++ = ((const PixelRGB*) src)->getGreen();
*dst++ = ((const PixelRGB*) src)->getBlue();
src += srcData.pixelStride;
}
}
else
{
for (int x = 0; x < srcData.width; ++x)
{
const Colour pixel (srcData.getPixelColour (x, (int) jpegCompStruct.next_scanline));
*dst++ = pixel.getRed();
*dst++ = pixel.getGreen();
*dst++ = pixel.getBlue();
}
}
jpeg_write_scanlines (&jpegCompStruct, buffer, 1);
}
jpeg_finish_compress (&jpegCompStruct);
jpeg_destroy_compress (&jpegCompStruct);
return true;
}