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/*
* File: imgbuf.cc
*
* Copyright (C) 2008 Jorge Arellano Cid <jcid@dillo.org>,
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*/
#include "msg.h"
#include "imgbuf.hh"
#include "dw/core.hh"
#include "dw/image.hh"
using namespace dw::core;
/*
* Local data
*/
static size_t linebuf_size = 0;
static uchar_t *linebuf = NULL;
/*
* Decode 'buf' (an image line) into RGB format.
*/
static uchar_t *Imgbuf_rgb_line(const uchar_t *buf,
DilloImgType type, uchar_t *cmap,
uint_t width, uint_t y)
{
uint_t x;
switch (type) {
case DILLO_IMG_TYPE_INDEXED:
if (cmap) {
for (x = 0; x < width; x++)
memcpy(linebuf + x * 3, cmap + buf[x] * 3, 3);
} else {
MSG_WARN("Gif:: image lacks a color map\n");
}
break;
case DILLO_IMG_TYPE_GRAY:
for (x = 0; x < width; x++)
memset(linebuf + x * 3, buf[x], 3);
break;
case DILLO_IMG_TYPE_CMYK_INV:
/*
* We treat CMYK as if it were "RGBW", and it works. Everyone who is
* trying to handle CMYK jpegs is confused by this, and supposedly
* the issue is that Adobe CMYK is "wrong" but ubiquitous.
*/
for (x = 0; x < width; x++) {
uint_t white = buf[x * 4 + 3];
linebuf[x * 3] = buf[x * 4] * white / 0x100;
linebuf[x * 3 + 1] = buf[x * 4 + 1] * white / 0x100;
linebuf[x * 3 + 2] = buf[x * 4 + 2] * white / 0x100;
}
break;
case DILLO_IMG_TYPE_RGB:
/* avoid a memcpy here! --Jcid */
return (uchar_t *)buf;
case DILLO_IMG_TYPE_NOTSET:
MSG_ERR("Imgbuf_rgb_line: type not set...\n");
break;
}
return linebuf;
}
// Wrappers for Imgbuf -------------------------------------------------------
/*
* Increment reference count for an Imgbuf
*/
void a_Imgbuf_ref(void *v_imgbuf)
{
((Imgbuf*)v_imgbuf)->ref();
}
/*
* Decrement reference count for an Imgbuf
*/
void a_Imgbuf_unref(void *v_imgbuf)
{
if (v_imgbuf)
((Imgbuf*)v_imgbuf)->unref();
}
/*
* Create a new Imgbuf
*/
void *a_Imgbuf_new(void *layout, int img_type, uint_t width, uint_t height,
double gamma)
{
if (!layout) {
MSG_ERR("a_Imgbuf_new: layout is NULL.\n");
exit(1);
}
// Assert linebuf is wide enough.
if (3 * width > linebuf_size) {
linebuf_size = 3 * width;
linebuf = (uchar_t*) dRealloc(linebuf, linebuf_size);
}
return (void*)((Layout*)layout)->createImgbuf(Imgbuf::RGB, width, height,
gamma);
}
/*
* Last reference for this Imgbuf?
*/
int a_Imgbuf_last_reference(void *v_imgbuf)
{
return ((Imgbuf*)v_imgbuf)->lastReference () ? 1 : 0;
}
/*
* Update the root buffer of an imgbuf.
*/
void a_Imgbuf_update(void *v_imgbuf, const uchar_t *buf, DilloImgType type,
uchar_t *cmap, uint_t width, uint_t height, uint_t y)
{
dReturn_if_fail ( y < height );
/* Decode 'buf' and copy it into the imgbuf */
uchar_t *newbuf = Imgbuf_rgb_line(buf, type, cmap, width, y);
((Imgbuf*)v_imgbuf)->copyRow(y, (byte *)newbuf);
}
/*
* Reset for a new scan from a multiple-scan image.
*/
void a_Imgbuf_new_scan(void *v_imgbuf)
{
((Imgbuf*)v_imgbuf)->newScan();
}
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