llimagej2coj.cpp

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#include "linden_common.h"
#include "llimagej2coj.h"

// this is defined so that we get static linking.
#include "openjpeg/openjpeg.h"

#include "lltimer.h"
#include "llmemory.h"

const char* fallbackEngineInfoLLImageJ2CImpl()
{
        return (std::string("OpenJPEG: " OPENJPEG_VERSION ", Runtime: ")
                + opj_version()).c_str();
}

LLImageJ2CImpl* fallbackCreateLLImageJ2CImpl()
{
        return new LLImageJ2COJ();
}

void fallbackDestroyLLImageJ2CImpl(LLImageJ2CImpl* impl)
{
        delete impl;
        impl = NULL;
}

void error_callback(const char* msg, void*)
{
        lldebugs << "LLImageJ2CImpl error_callback: " << msg << llendl;
}
void warning_callback(const char* msg, void*)
{
        lldebugs << "LLImageJ2CImpl warning_callback: " << msg << llendl;
}
void info_callback(const char* msg, void*)
{
        lldebugs << "LLImageJ2CImpl info_callback: " << msg << llendl;
}


LLImageJ2COJ::LLImageJ2COJ() : LLImageJ2CImpl()
{
}


LLImageJ2COJ::~LLImageJ2COJ()
{
}


BOOL LLImageJ2COJ::decodeImpl(LLImageJ2C &base, LLImageRaw &raw_image, F32 decode_time, S32 first_channel, S32 max_channel_count)
{
        //
        // FIXME: Get the comment field out of the texture
        //

        LLTimer decode_timer;

        opj_dparameters_t parameters;   /* decompression parameters */
        opj_event_mgr_t event_mgr;              /* event manager */
        opj_image_t *image = NULL;

        opj_dinfo_t* dinfo = NULL;      /* handle to a decompressor */
        opj_cio_t *cio = NULL;


        /* configure the event callbacks (not required) */
        memset(&event_mgr, 0, sizeof(opj_event_mgr_t));
        event_mgr.error_handler = error_callback;
        event_mgr.warning_handler = warning_callback;
        event_mgr.info_handler = info_callback;

        /* set decoding parameters to default values */
        opj_set_default_decoder_parameters(&parameters);

        parameters.cp_reduce = base.getRawDiscardLevel();

        /* decode the code-stream */
        /* ---------------------- */

        /* JPEG-2000 codestream */

        /* get a decoder handle */
        dinfo = opj_create_decompress(CODEC_J2K);

        /* catch events using our callbacks and give a local context */
        opj_set_event_mgr((opj_common_ptr)dinfo, &event_mgr, stderr);                   

        /* setup the decoder decoding parameters using user parameters */
        opj_setup_decoder(dinfo, &parameters);

        /* open a byte stream */
        cio = opj_cio_open((opj_common_ptr)dinfo, base.getData(), base.getDataSize());

        /* decode the stream and fill the image structure */
        image = opj_decode(dinfo, cio);

        /* close the byte stream */
        opj_cio_close(cio);

        /* free remaining structures */
        if(dinfo)
        {
                opj_destroy_decompress(dinfo);
        }

        // The image decode failed if the return was NULL or the component
        // count was zero.  The latter is just a sanity check before we
        // dereference the array.
        if(!image || !image->numcomps)
        {
                fprintf(stderr, "ERROR -> decodeImpl: failed to decode image!\n");
                if (image)
                        opj_image_destroy(image);

                return TRUE; // done
        }

        // Copy image data into our raw image format (instead of the separate channel format

        S32 img_components = image->numcomps;
        S32 channels = img_components - first_channel;
        if( channels > max_channel_count )
                channels = max_channel_count;

        // Component buffers are allocated in an image width by height buffer.
        // The image placed in that buffer is ceil(width/2^factor) by
        // ceil(height/2^factor) and if the factor isn't zero it will be at the
        // top left of the buffer with black filled in the rest of the pixels.
        // It is integer math so the formula is written in ceildivpo2.
        // (Assuming all the components have the same width, height and
        // factor.)
        S32 comp_width = image->comps[0].w;
        S32 f=image->comps[0].factor;
        S32 width = ceildivpow2(image->x1 - image->x0, f);
        S32 height = ceildivpow2(image->y1 - image->y0, f);
        raw_image.resize(width, height, channels);
        U8 *rawp = raw_image.getData();

        // first_channel is what channel to start copying from
        // dest is what channel to copy to.  first_channel comes from the
        // argument, dest always starts writing at channel zero.
        for (S32 comp = first_channel, dest=0; comp < first_channel + channels;
                comp++, dest++)
        {
                S32 offset = dest;
                for (S32 y = (height - 1); y >= 0; y--)
                {
                        for (S32 x = 0; x < width; x++)
                        {
                                rawp[offset] = image->comps[comp].data[y*comp_width + x];
                                offset += channels;
                        }
                }
        }

        /* free image data structure */
        opj_image_destroy(image);

        return TRUE; // done
}


BOOL LLImageJ2COJ::encodeImpl(LLImageJ2C &base, const LLImageRaw &raw_image, const char* comment_text, F32 encode_time, BOOL reversible)
{
        const S32 MAX_COMPS = 5;
        opj_cparameters_t parameters;   /* compression parameters */
        opj_event_mgr_t event_mgr;              /* event manager */


        /* 
        configure the event callbacks (not required)
        setting of each callback is optional 
        */
        memset(&event_mgr, 0, sizeof(opj_event_mgr_t));
        event_mgr.error_handler = error_callback;
        event_mgr.warning_handler = warning_callback;
        event_mgr.info_handler = info_callback;

        /* set encoding parameters to default values */
        opj_set_default_encoder_parameters(&parameters);
        parameters.tcp_rates[0] = 0;
        parameters.tcp_numlayers++;
        parameters.cp_disto_alloc = 1;
        parameters.cod_format = 0;
        if (!comment_text)
        {
                parameters.cp_comment = "";
        }
        else
        {
                // Awful hacky cast, too lazy to copy right now.
                parameters.cp_comment = (char *)comment_text;
        }

        //
        // Fill in the source image from our raw image
        //
        OPJ_COLOR_SPACE color_space = CLRSPC_SRGB;
        opj_image_cmptparm_t cmptparm[MAX_COMPS];
        opj_image_t * image = NULL;
        S32 numcomps = raw_image.getComponents();
        S32 width = raw_image.getWidth();
        S32 height = raw_image.getHeight();

        memset(&cmptparm[0], 0, MAX_COMPS * sizeof(opj_image_cmptparm_t));
        for(S32 c = 0; c < numcomps; c++) {
                cmptparm[c].prec = 8;
                cmptparm[c].bpp = 8;
                cmptparm[c].sgnd = 0;
                cmptparm[c].dx = parameters.subsampling_dx;
                cmptparm[c].dy = parameters.subsampling_dy;
                cmptparm[c].w = width;
                cmptparm[c].h = height;
        }

        /* create the image */
        image = opj_image_create(numcomps, &cmptparm[0], color_space);

        image->x1 = width;
        image->y1 = height;

        S32 i = 0;
        const U8 *src_datap = raw_image.getData();
        for (S32 y = height - 1; y >= 0; y--)
        {
                for (S32 x = 0; x < width; x++)
                {
                        const U8 *pixel = src_datap + (y*width + x) * numcomps;
                        for (S32 c = 0; c < numcomps; c++)
                        {
                                image->comps[c].data[i] = *pixel;
                                pixel++;
                        }
                        i++;
                }
        }



        /* encode the destination image */
        /* ---------------------------- */

        int codestream_length;
        opj_cio_t *cio = NULL;

        /* get a J2K compressor handle */
        opj_cinfo_t* cinfo = opj_create_compress(CODEC_J2K);

        /* catch events using our callbacks and give a local context */
        opj_set_event_mgr((opj_common_ptr)cinfo, &event_mgr, stderr);                   

        /* setup the encoder parameters using the current image and using user parameters */
        opj_setup_encoder(cinfo, &parameters, image);

        /* open a byte stream for writing */
        /* allocate memory for all tiles */
        cio = opj_cio_open((opj_common_ptr)cinfo, NULL, 0);

        /* encode the image */
        bool bSuccess = opj_encode(cinfo, cio, image, parameters.index);
        if (!bSuccess)
        {
                opj_cio_close(cio);
                llinfos << "Failed to encode image." << llendl;
                return FALSE;
        }
        codestream_length = cio_tell(cio);

        base.copyData(cio->buffer, codestream_length);
        base.updateData(); // set width, height

        /* close and free the byte stream */
        opj_cio_close(cio);

        /* free remaining compression structures */
        opj_destroy_compress(cinfo);


        /* free user parameters structure */
        if(parameters.cp_matrice) free(parameters.cp_matrice);

        /* free image data */
        opj_image_destroy(image);
        return TRUE;
}

BOOL LLImageJ2COJ::getMetadata(LLImageJ2C &base)
{
        //
        // FIXME: We get metadata by decoding the ENTIRE image.
        //

        // Update the raw discard level
        base.updateRawDiscardLevel();

        opj_dparameters_t parameters;   /* decompression parameters */
        opj_event_mgr_t event_mgr;              /* event manager */
        opj_image_t *image = NULL;

        opj_dinfo_t* dinfo = NULL;      /* handle to a decompressor */
        opj_cio_t *cio = NULL;


        /* configure the event callbacks (not required) */
        memset(&event_mgr, 0, sizeof(opj_event_mgr_t));
        event_mgr.error_handler = error_callback;
        event_mgr.warning_handler = warning_callback;
        event_mgr.info_handler = info_callback;

        /* set decoding parameters to default values */
        opj_set_default_decoder_parameters(&parameters);

        // Only decode what's required to get the size data.
        parameters.cp_limit_decoding=LIMIT_TO_MAIN_HEADER;

        //parameters.cp_reduce = mRawDiscardLevel;

        /* decode the code-stream */
        /* ---------------------- */

        /* JPEG-2000 codestream */

        /* get a decoder handle */
        dinfo = opj_create_decompress(CODEC_J2K);

        /* catch events using our callbacks and give a local context */
        opj_set_event_mgr((opj_common_ptr)dinfo, &event_mgr, stderr);                   

        /* setup the decoder decoding parameters using user parameters */
        opj_setup_decoder(dinfo, &parameters);

        /* open a byte stream */
        cio = opj_cio_open((opj_common_ptr)dinfo, base.getData(), base.getDataSize());

        /* decode the stream and fill the image structure */
        image = opj_decode(dinfo, cio);

        /* close the byte stream */
        opj_cio_close(cio);

        /* free remaining structures */
        if(dinfo)
        {
                opj_destroy_decompress(dinfo);
        }

        if(!image)
        {
                fprintf(stderr, "ERROR -> getMetadata: failed to decode image!\n");
                return FALSE;
        }

        // Copy image data into our raw image format (instead of the separate channel format
        S32 width = 0;
        S32 height = 0;

        S32 img_components = image->numcomps;
        width = image->x1 - image->x0;
        height = image->y1 - image->y0;
        base.setSize(width, height, img_components);

        /* free image data structure */
        opj_image_destroy(image);
        return TRUE;
}

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