gtk2/gdk-pixbuf/io-ras.c
Tor Lillqvist 59596e699f Use explicit G_MODULE_EXPORT decoration when building the loader in
2008-05-27  Tor Lillqvist  <tml@novell.com>

	* io-*.c: Use explicit G_MODULE_EXPORT decoration when building
	the loader in question as a module.

	* gdk-pixbuf-io.c: Enable included build of the icns and jasper
	loaders.


svn path=/trunk/; revision=20192
2008-05-27 16:51:33 +00:00

552 lines
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/* -*- mode: C; c-file-style: "linux" -*- */
/* GdkPixbuf library - SUNRAS image loader
*
* Copyright (C) 1999 The Free Software Foundation
*
* Authors: Arjan van de Ven <arjan@fenrus.demon.nl>
* Federico Mena-Quintero <federico@gimp.org>
*
* Based on io-gif.c, io-tiff.c and io-png.c
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
Known bugs:
* Compressed rasterfiles don't work yet
*/
#include <config.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <string.h>
#include "gdk-pixbuf-private.h"
#include "gdk-pixbuf-io.h"
/*
Header structure for sunras files.
All values are in big-endian order on disk
Note: Every scanline is padded to be a multiple of 16 bits
*/
struct rasterfile {
guint magic;
guint width;
guint height;
guint depth;
guint length;
guint type;
guint maptype;
guint maplength;
};
/*
This does a byte-order swap. Does glib have something like
be32_to_cpu() ??
*/
/* Progressive loading */
struct ras_progressive_state {
GdkPixbufModuleSizeFunc size_func;
GdkPixbufModulePreparedFunc prepared_func;
GdkPixbufModuleUpdatedFunc updated_func;
gpointer user_data;
gint HeaderSize; /* The size of the header-part (incl colormap) */
guchar *HeaderBuf; /* The buffer for the header (incl colormap) */
gint HeaderDone; /* The nr of bytes actually in HeaderBuf */
gint LineWidth; /* The width of a line in bytes */
guchar *LineBuf; /* Buffer for 1 line */
gint LineDone; /* # of bytes in LineBuf */
gint Lines; /* # of finished lines */
gint RasType; /* 32 = BGRA
24 = BGR
8 = 8 bit colormapped
1 = 1 bit bitonal
*/
gint DecoderState;
struct rasterfile Header; /* Decoded (BE->CPU) header */
GdkPixbuf *pixbuf; /* Our "target" */
};
static gpointer
gdk_pixbuf__ras_image_begin_load(GdkPixbufModuleSizeFunc size_func,
GdkPixbufModulePreparedFunc prepared_func,
GdkPixbufModuleUpdatedFunc updated_func,
gpointer user_data,
GError **error);
static gboolean gdk_pixbuf__ras_image_stop_load(gpointer data, GError **error);
static gboolean gdk_pixbuf__ras_image_load_increment(gpointer data,
const guchar * buf, guint size,
GError **error);
static gboolean RAS2State(struct rasterfile *RAS,
struct ras_progressive_state *State,
GError **error)
{
State->Header.width = GUINT32_FROM_BE(RAS->width);
State->Header.height = GUINT32_FROM_BE(RAS->height);
State->Header.depth = GUINT32_FROM_BE(RAS->depth);
State->Header.type = GUINT32_FROM_BE(RAS->type);
State->Header.maptype = GUINT32_FROM_BE(RAS->maptype);
State->Header.maplength = GUINT32_FROM_BE(RAS->maplength);
if ((gint)State->Header.width <= 0 ||
(gint)State->Header.height <= 0 ||
State->Header.maplength > 768) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
_("RAS image has bogus header data"));
return FALSE;
}
State->RasType = State->Header.depth; /* This may be less trivial someday */
State->HeaderSize = 32 + State->Header.maplength;
if (State->RasType == 32)
State->LineWidth = State->Header.width * 4;
else if (State->RasType == 24)
State->LineWidth = State->Header.width * 3;
else if (State->RasType == 8)
State->LineWidth = State->Header.width * 1;
else if (State->RasType == 1) {
State->LineWidth = State->Header.width / 8;
if ((State->Header.width & 7) != 0)
State->LineWidth++;
}
else {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
_("RAS image has unknown type"));
return FALSE;
}
if (State->Header.type > 2 || State->Header.maptype > 1) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
_("unsupported RAS image variation"));
return FALSE;
}
/* Now pad the line to be a multiple of 16 bits */
if ((State->LineWidth & 1) != 0)
State->LineWidth++;
if (!State->LineBuf) {
State->LineBuf = g_try_malloc (State->LineWidth);
if (!State->LineBuf) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
_("Not enough memory to load RAS image"));
return FALSE;
}
}
if (!State->pixbuf) {
if (State->size_func) {
gint width = State->Header.width;
gint height = State->Header.height;
(*State->size_func) (&width, &height, State->user_data);
if (width == 0 || height == 0)
return FALSE;
}
if (State->RasType == 32)
State->pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
(gint) State->Header.width,
(gint) State->Header.height);
else
State->pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8,
(gint) State->Header.width,
(gint) State->Header.height);
if (!State->pixbuf) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
_("Not enough memory to load RAS image"));
return FALSE;
}
if (State->prepared_func != NULL)
/* Notify the client that we are ready to go */
(*State->prepared_func) (State->pixbuf,
NULL,
State->user_data);
}
if ((State->Header.maplength == 0) && (State->RasType == 1)) {
State->HeaderBuf[32] = 255;
State->HeaderBuf[33] = 0;
State->HeaderBuf[34] = 255;
State->HeaderBuf[35] = 0;
State->HeaderBuf[36] = 255;
State->HeaderBuf[37] = 0;
}
return TRUE;
}
/*
* func - called when we have pixmap created (but no image data)
* user_data - passed as arg 1 to func
* return context (opaque to user)
*/
static gpointer
gdk_pixbuf__ras_image_begin_load(GdkPixbufModuleSizeFunc size_func,
GdkPixbufModulePreparedFunc prepared_func,
GdkPixbufModuleUpdatedFunc updated_func,
gpointer user_data,
GError **error)
{
struct ras_progressive_state *context;
context = g_new0(struct ras_progressive_state, 1);
context->size_func = size_func;
context->prepared_func = prepared_func;
context->updated_func = updated_func;
context->user_data = user_data;
context->HeaderSize = 32;
context->HeaderBuf = g_malloc(32 + 768); /* 32 for rasheader,
768 for the colormap */
context->HeaderDone = 0;
context->LineWidth = 0;
context->LineBuf = NULL;
context->LineDone = 0;
context->Lines = 0;
context->RasType = 0;
context->DecoderState = 0;
memset(&context->Header, 0, sizeof(struct rasterfile));
context->pixbuf = NULL;
return (gpointer) context;
}
/*
* context - returned from image_begin_load
*
* free context, unref gdk_pixbuf
*/
static gboolean
gdk_pixbuf__ras_image_stop_load(gpointer data, GError **error)
{
struct ras_progressive_state *context =
(struct ras_progressive_state *) data;
/* FIXME this thing needs to report errors if
* we have unused image data
*/
g_return_val_if_fail(context != NULL, TRUE);
g_free(context->LineBuf);
g_free(context->HeaderBuf);
if (context->pixbuf)
g_object_unref(context->pixbuf);
g_free(context);
return TRUE;
}
/*
OneLine is called when enough data is received to process 1 line
of pixels
*/
static void OneLine32(struct ras_progressive_state *context)
{
gint X;
guchar *Pixels;
X = 0;
Pixels = context->pixbuf->pixels + context->pixbuf->rowstride * context->Lines;
while (X < context->Header.width) {
/* The joys of having a BGR byteorder */
Pixels[X * 4 + 0] = context->LineBuf[X * 4 + 2];
Pixels[X * 4 + 1] = context->LineBuf[X * 4 + 1];
Pixels[X * 4 + 2] = context->LineBuf[X * 4 + 0];
Pixels[X * 4 + 3] = context->LineBuf[X * 4 + 3];
X++;
}
}
static void OneLine24(struct ras_progressive_state *context)
{
gint X;
guchar *Pixels;
X = 0;
Pixels = context->pixbuf->pixels + context->pixbuf->rowstride * context->Lines;
while (X < context->Header.width) {
/* The joys of having a BGR byteorder */
Pixels[X * 3 + 0] = context->LineBuf[X * 3 + 2];
Pixels[X * 3 + 1] = context->LineBuf[X * 3 + 1];
Pixels[X * 3 + 2] = context->LineBuf[X * 3 + 0];
X++;
}
}
static void OneLine8(struct ras_progressive_state *context)
{
gint X;
guchar *Pixels;
int offset = context->Header.maplength / 3;
X = 0;
Pixels = context->pixbuf->pixels + context->pixbuf->rowstride * context->Lines;
while (X < context->Header.width) {
/* The joys of having a BGR byteorder */
Pixels[X * 3 + 0] =
context->HeaderBuf[context->LineBuf[X] + 32];
Pixels[X * 3 + 1] =
context->HeaderBuf[context->LineBuf[X] + offset + 32];
Pixels[X * 3 + 2] =
context->HeaderBuf[context->LineBuf[X] + 2*offset + 32];
X++;
}
}
static void OneLine1(struct ras_progressive_state *context)
{
gint X;
guchar *Pixels;
X = 0;
Pixels = context->pixbuf->pixels + context->pixbuf->rowstride * context->Lines;
while (X < context->Header.width) {
int Bit;
Bit = (context->LineBuf[X/8])>>(7-(X&7));
Bit = Bit & 1;
/* The joys of having a BGR byteorder */
Pixels[X * 3 + 0] =
context->HeaderBuf[Bit + 32];
Pixels[X * 3 + 1] =
context->HeaderBuf[Bit + 2 + 32];
Pixels[X * 3 + 2] =
context->HeaderBuf[Bit + 4 + 32];
X++;
}
}
static void OneLine(struct ras_progressive_state *context)
{
context->LineDone = 0;
if (context->Lines >= context->Header.height)
return;
if (context->RasType == 32)
OneLine32(context);
if (context->RasType == 24)
OneLine24(context);
if (context->RasType == 8)
OneLine8(context);
if (context->RasType == 1)
OneLine1(context);
context->LineDone = 0;
context->Lines++;
if (context->updated_func != NULL) {
(*context->updated_func) (context->pixbuf,
0,
context->Lines,
context->Header.width,
1,
context->user_data);
}
}
static gboolean
DoCompressed (struct ras_progressive_state *context,
const guchar * buf, guint size,
GError **error)
{
int i;
for (i = 0; i < size; i++) {
switch (context->DecoderState) {
case 0:
if (buf[i] == 0x80)
context->DecoderState = 1;
else
context->LineBuf[context->LineDone++] = buf[i];
break;
case 1:
if (buf[i] == 0) {
context->LineBuf[context->LineDone++] = 0x80;
context->DecoderState = 0;
}
else
context->DecoderState = buf[i] + 1;
break;
default:
for (; context->DecoderState; context->DecoderState--) {
context->LineBuf[context->LineDone++] = buf[i];
if ((context->LineDone >= context->LineWidth) && (context->LineWidth > 0))
OneLine(context);
}
}
if ((context->LineDone >= context->LineWidth) && (context->LineWidth > 0))
OneLine(context);
}
return TRUE;
}
/*
* context - from image_begin_load
* buf - new image data
* size - length of new image data
*
* append image data onto incrementally built output image
*/
static gboolean
gdk_pixbuf__ras_image_load_increment(gpointer data,
const guchar * buf, guint size,
GError **error)
{
struct ras_progressive_state *context =
(struct ras_progressive_state *) data;
gint BytesToCopy;
while (size > 0) {
if (context->HeaderDone < context->HeaderSize) { /* We still
have headerbytes to do */
BytesToCopy =
context->HeaderSize - context->HeaderDone;
if (BytesToCopy > size)
BytesToCopy = size;
memmove(context->HeaderBuf + context->HeaderDone,
buf, BytesToCopy);
size -= BytesToCopy;
buf += BytesToCopy;
context->HeaderDone += BytesToCopy;
} else if (context->Header.type == 2) {
if (!DoCompressed (context, buf, size, error)) {
return FALSE;
}
size = 0;
}
else {
BytesToCopy =
context->LineWidth - context->LineDone;
if (BytesToCopy > size)
BytesToCopy = size;
if (BytesToCopy > 0) {
memmove(context->LineBuf +
context->LineDone, buf,
BytesToCopy);
size -= BytesToCopy;
buf += BytesToCopy;
context->LineDone += BytesToCopy;
}
if ((context->LineDone >= context->LineWidth) &&
(context->LineWidth > 0))
OneLine(context);
}
if (context->HeaderDone >= 32)
if (!RAS2State((struct rasterfile *) context->HeaderBuf,
context, error)) {
return FALSE;
}
}
return TRUE;
}
#ifndef INCLUDE_ras
#define MODULE_ENTRY(function) G_MODULE_EXPORT void function
#else
#define MODULE_ENTRY(function) void _gdk_pixbuf__ras_ ## function
#endif
MODULE_ENTRY (fill_vtable) (GdkPixbufModule *module)
{
module->begin_load = gdk_pixbuf__ras_image_begin_load;
module->stop_load = gdk_pixbuf__ras_image_stop_load;
module->load_increment = gdk_pixbuf__ras_image_load_increment;
}
MODULE_ENTRY (fill_info) (GdkPixbufFormat *info)
{
static GdkPixbufModulePattern signature[] = {
{ "\x59\xa6\x6a\x95", NULL, 100 },
{ NULL, NULL, 0 }
};
static gchar * mime_types[] = {
"image/x-cmu-raster",
"image/x-sun-raster",
NULL
};
static gchar * extensions[] = {
"ras",
NULL
};
info->name = "ras";
info->signature = signature;
info->description = N_("The Sun raster image format");
info->mime_types = mime_types;
info->extensions = extensions;
info->flags = GDK_PIXBUF_FORMAT_THREADSAFE;
info->license = "LGPL";
}