int
decodeWEBP(Ychannel *channel, Vbitmap *vbitmap,
YmagineFormatOptions *options)
{
int nlines = -1;
#if HAVE_WEBP
WEBPDec webp;
#endif
if (!YchannelReadable(channel)) {
#if YMAGINE_DEBUG_WEBP
ALOGD("input channel not readable");
#endif
return nlines;
}
#if HAVE_WEBP
if (WEBPInit(&webp, channel, vbitmap) == YMAGINE_OK) {
nlines = WEBPDecode(&webp, vbitmap, options);
WEBPFini(&webp);
}
#endif
return nlines;
}
int
decodeJPEG(Ychannel *channel, Vbitmap *vbitmap,
YmagineFormatOptions *options)
{
struct jpeg_decompress_struct cinfo;
struct noop_error_mgr jerr;
int nlines = -1;
if (!YchannelReadable(channel)) {
#if YMAGINE_DEBUG_JPEG
ALOGD("input channel not readable");
#endif
return nlines;
}
memset(&cinfo, 0, sizeof(struct jpeg_decompress_struct));
cinfo.err = noop_jpeg_std_error(&jerr.pub);
/* Establish the setjmp return context for noop_error_exit to use. */
if (setjmp(jerr.setjmp_buffer)) {
/* If we get here, the JPEG code has signaled an error. */
noop_append_jpeg_message((j_common_ptr) &cinfo);
} else {
jpeg_create_decompress(&cinfo);
if (ymaginejpeg_input(&cinfo, channel) >= 0) {
nlines = bitmap_decode(&cinfo, vbitmap,
options);
}
}
jpeg_destroy_decompress(&cinfo);
return nlines;
}
int
matchJPEG(Ychannel *channel)
{
unsigned char header[8];
int hlen;
if (!YchannelReadable(channel)) {
return YFALSE;
}
hlen = YchannelRead(channel, header, sizeof(header));
if (hlen > 0) {
YchannelPush(channel, (const char*) header, hlen);
}
if (hlen < 3) {
return YFALSE;
}
if ( (header[0] != 0xff) || (header[1] != 0xd8) || (header[2] != 0xff) ) {
return YFALSE;
}
return YTRUE;
}
int
matchWEBP(Ychannel *channel)
{
#if HAVE_WEBP
char header[WEBP_HEADER_SIZE];
int hlen;
if (!YchannelReadable(channel)) {
return YFALSE;
}
hlen = YchannelRead(channel, header, sizeof(header));
if (hlen > 0) {
YchannelPush(channel, header, hlen);
}
if (WebpCheckHeader(header, hlen) > 0) {
return YTRUE;
}
#endif
return YFALSE;
}
int
transcodeJPEG(Ychannel *channelin, Ychannel *channelout,
YmagineFormatOptions *options)
{
struct jpeg_decompress_struct cinfo;
struct noop_error_mgr jerr;
struct jpeg_compress_struct cinfoout;
struct noop_error_mgr jerr2;
int rc = YMAGINE_ERROR;
int nlines = 0;
int quality = YmagineFormatOptions_normalizeQuality(options);
if (!YchannelReadable(channelin) || !YchannelWritable(channelout)) {
return rc;
}
memset(&cinfo, 0, sizeof(struct jpeg_decompress_struct));
cinfo.err = noop_jpeg_std_error(&jerr.pub);
memset(&cinfoout, 0, sizeof(struct jpeg_compress_struct));
cinfoout.err = noop_jpeg_std_error(&jerr2.pub);
if (setjmp(jerr.setjmp_buffer)) {
/* If we get here, the JPEG code has signaled an error in decoder */
noop_append_jpeg_message((j_common_ptr) &cinfo);
} else if (setjmp(jerr2.setjmp_buffer)) {
/* If we get here, the JPEG code has signaled an error in encoder */
noop_append_jpeg_message((j_common_ptr) &cinfoout);
} else {
jpeg_create_decompress(&cinfo);
/* Equivalent to:
jpeg_CreateCompress(&cinfoout, JPEG_LIB_VERSION,
(size_t) sizeof(struct jpeg_compress_struct));
*/
jpeg_create_compress(&cinfoout);
if (ymaginejpeg_input(&cinfo, channelin) >= 0 &&
ymaginejpeg_output(&cinfoout, channelout) >= 0) {
if (prepareDecompressor(&cinfo, options) == YMAGINE_OK) {
/* markers copy option (NONE, COMMENTS or ALL) */
JCOPY_OPTION copyoption;
int metamode = YMAGINE_METAMODE_DEFAULT;
if (options != NULL) {
metamode = options->metamode;
}
if (metamode == YMAGINE_METAMODE_NONE) {
copyoption = JCOPYOPT_NONE;
} else if (metamode == YMAGINE_METAMODE_COMMENTS) {
copyoption = JCOPYOPT_COMMENTS;
} else if (metamode == YMAGINE_METAMODE_ALL) {
copyoption = JCOPYOPT_ALL;
} else {
/* Default to copy all markers */
copyoption = JCOPYOPT_ALL;
}
/* Enable saving of extra markers that we want to copy */
if (copyoption != JCOPYOPT_NONE) {
jcopy_markers_setup(&cinfo, copyoption);
}
/* Force image to be decoded without colorspace conversion if possible */
if (jpeg_read_header(&cinfo, TRUE) == JPEG_HEADER_OK) {
YmagineFormatOptions_invokeCallback(options, YMAGINE_IMAGEFORMAT_JPEG,
cinfo.image_width, cinfo.image_height);
/* Other compression settings */
int optimize = 0;
int progressive = 0;
int grayscale = 0;
if (quality >= 90) {
optimize = 1;
}
if (options != NULL && options->pixelshader != NULL) {
/* If a shader is enabled, force RGBA mode */
cinfo.out_color_space = JCS_EXT_RGBA;
cinfoout.in_color_space = cinfo.out_color_space;
cinfoout.input_components = 4;
} else if (options != NULL && options->sharpen > 0.0f) {
cinfo.out_color_space = JCS_RGB;
cinfoout.in_color_space = cinfo.out_color_space;
cinfoout.input_components = 3;
} else {
/* Otherwise sse same colorspace than input image (typically YCbCr) */
cinfo.out_color_space = cinfo.jpeg_color_space;
cinfoout.in_color_space = cinfo.out_color_space;
cinfoout.input_components = JpegPixelSize(cinfoout.in_color_space);
}
jpeg_set_defaults(&cinfoout);
cinfoout.optimize_coding = FALSE;
jpeg_set_quality(&cinfoout, quality, FALSE);
if (grayscale) {
/* Force a monochrome JPEG file to be generated. */
jpeg_set_colorspace(&cinfoout, JCS_GRAYSCALE);
}
if (optimize) {
/* Enable entropy parm optimization. */
cinfoout.optimize_coding = TRUE;
}
/* If non-zero, the input image is smoothed; the value should
be 1 for minimal smoothing to 100 for maximum smoothing. */
cinfoout.smoothing_factor = 0;
if (progressive) {
/* Select simple progressive mode. */
jpeg_simple_progression(&cinfoout);
}
setCompressorOptions(&cinfoout, options);
cinfo.client_data = (void*) NULL;
cinfoout.client_data = (void*) NULL;
nlines = decompress_jpeg(&cinfo, &cinfoout, copyoption, NULL, options);
if (nlines > 0) {
rc = YMAGINE_OK;
}
}
}
}
}
jpeg_destroy_compress(&cinfoout);
jpeg_destroy_decompress(&cinfo);
return rc;
}
