/*
* Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include "splashscreen_impl.h"
#include "jinclude.h"
#include "jpeglib.h"
#include "jerror.h"
#include <setjmp.h>
/* stream input handling */
typedef struct
{
struct jpeg_source_mgr pub; /* public fields */
SplashStream * stream; /* source stream */
JOCTET *buffer; /* start of buffer */
boolean start_of_file; /* have we gotten any data yet? */
} stream_source_mgr;
typedef stream_source_mgr *stream_src_ptr;
#define INPUT_BUF_SIZE 4096 /* choose an efficiently fread'able size */
METHODDEF(void)
stream_init_source(j_decompress_ptr cinfo)
{
stream_src_ptr src = (stream_src_ptr) cinfo->src;
src->start_of_file = TRUE;
}
METHODDEF(boolean)
stream_fill_input_buffer(j_decompress_ptr cinfo)
{
stream_src_ptr src = (stream_src_ptr) cinfo->src;
size_t nbytes;
nbytes = src->stream->read(src->stream, src->buffer, INPUT_BUF_SIZE);
if (nbytes <= 0) {
if (src->start_of_file) /* Treat empty input file as fatal error */
ERREXIT(cinfo, JERR_INPUT_EMPTY);
WARNMS(cinfo, JWRN_JPEG_EOF);
/* Insert a fake EOI marker */
src->buffer[0] = (JOCTET) 0xFF;
src->buffer[1] = (JOCTET) JPEG_EOI;
nbytes = 2;
}
src->pub.next_input_byte = src->buffer;
src->pub.bytes_in_buffer = nbytes;
src->start_of_file = FALSE;
return TRUE;
}
METHODDEF(void)
stream_skip_input_data(j_decompress_ptr cinfo, long num_bytes)
{
stream_src_ptr src = (stream_src_ptr) cinfo->src;
if (num_bytes > 0) {
while (num_bytes > (long) src->pub.bytes_in_buffer) {
num_bytes -= (long) src->pub.bytes_in_buffer;
(void) stream_fill_input_buffer(cinfo);
}
src->pub.next_input_byte += (size_t) num_bytes;
src->pub.bytes_in_buffer -= (size_t) num_bytes;
}
}
METHODDEF(void)
stream_term_source(j_decompress_ptr cinfo)
{
}
static void
set_stream_src(j_decompress_ptr cinfo, SplashStream * stream)
{
stream_src_ptr src;
if (cinfo->src == NULL) { /* first time for this JPEG object? */
cinfo->src = (struct jpeg_source_mgr *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo,
JPOOL_PERMANENT, SIZEOF(stream_source_mgr));
src = (stream_src_ptr) cinfo->src;
src->buffer = (JOCTET *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo,
JPOOL_PERMANENT, INPUT_BUF_SIZE * SIZEOF(JOCTET));
}
src = (stream_src_ptr) cinfo->src;
src->pub.init_source = stream_init_source;
src->pub.fill_input_buffer = stream_fill_input_buffer;
src->pub.skip_input_data = stream_skip_input_data;
src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
src->pub.term_source = stream_term_source;
src->stream = stream;
src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
src->pub.next_input_byte = NULL; /* until buffer loaded */
}
int
SplashDecodeJpeg(Splash * splash, struct jpeg_decompress_struct *cinfo)
{
int rowStride, stride;
JSAMPARRAY buffer;
ImageFormat srcFormat;
jpeg_read_header(cinfo, TRUE);
// SplashScreen jpeg converter expects data in RGB format only
cinfo->out_color_space = JCS_RGB;
jpeg_start_decompress(cinfo);
SplashCleanup(splash);
splash->width = cinfo->output_width;
splash->height = cinfo->output_height;
if (!SAFE_TO_ALLOC(splash->imageFormat.depthBytes, splash->width)) {
return 0;
}
stride = splash->width * splash->imageFormat.depthBytes;
if (!SAFE_TO_ALLOC(stride, splash->height)) {
return 0;
}
if (!SAFE_TO_ALLOC(cinfo->output_width, cinfo->output_components)) {
return 0;
}
splash->frameCount = 1;
splash->frames = (SplashImage *) malloc(sizeof(SplashImage) *
splash->frameCount);
if (splash->frames == NULL) {
return 0;
}
memset(splash->frames, 0, sizeof(SplashImage) *
splash->frameCount);
splash->loopCount = 1;
splash->frames[0].delay = 0;
splash->frames[0].bitmapBits = malloc(stride * splash->height);
if (splash->frames[0].bitmapBits == NULL) {
free(splash->frames);
return 0;
}
rowStride = cinfo->output_width * cinfo->output_components;
buffer = (*cinfo->mem->alloc_sarray)
((j_common_ptr) cinfo, JPOOL_IMAGE, rowStride, 1);
if (buffer == NULL) {
free(splash->frames[0].bitmapBits);
free(splash->frames);
return 0;
}
initFormat(&srcFormat, 0x00FF0000, 0x0000FF00, 0x000000FF, 0x00000000);
srcFormat.byteOrder = BYTE_ORDER_LSBFIRST;
srcFormat.depthBytes = 3;
srcFormat.fixedBits = 0xFF000000;
splash->maskRequired = 0; // reset maskRequired as JPEG can't be transparent
while (cinfo->output_scanline < cinfo->output_height) {
rgbquad_t *out =
(rgbquad_t *) ((byte_t *) splash->frames[0].bitmapBits +
cinfo->output_scanline * stride);
jpeg_read_scanlines(cinfo, buffer, 1);
convertLine(buffer[0], sizeof(JSAMPLE) * 3, out,
splash->imageFormat.depthBytes, cinfo->output_width, &srcFormat,
&splash->imageFormat, CVT_COPY, NULL, 0, NULL,
cinfo->output_scanline, 0);
}
jpeg_finish_decompress(cinfo);
return 1;
}
struct my_error_mgr
{
struct jpeg_error_mgr pub; /* "public" fields */
jmp_buf setjmp_buffer; /* for return to caller */
};
typedef struct my_error_mgr *my_error_ptr;
static void
my_error_exit(j_common_ptr cinfo)
{
/* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
my_error_ptr myerr = (my_error_ptr) cinfo->err;
/* Always display the message. */
/* We could postpone this until after returning, if we chose. */
(*cinfo->err->output_message) (cinfo);
/* Return control to the setjmp point */
longjmp(myerr->setjmp_buffer, 1);
}
int
SplashDecodeJpegStream(Splash * splash, SplashStream * stream)
{
struct jpeg_decompress_struct cinfo;
int success = 0;
struct my_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr.pub);
jerr.pub.error_exit = my_error_exit;
if (setjmp(jerr.setjmp_buffer)) {
goto done;
}
jpeg_create_decompress(&cinfo);
set_stream_src(&cinfo, stream);
success = SplashDecodeJpeg(splash, &cinfo);
done:
jpeg_destroy_decompress(&cinfo);
return success;
}