gtk2/gdk-pixbuf/io-bmp.c
Havoc Pennington 7a4c689387 Some updates
2000-10-18  Havoc Pennington  <hp@redhat.com>

	* gtk/gtk-sections.txt: Some updates

	* gdk/gdk-sections.txt: remove GdkPixbufAlphaMode

	* gdk-pixbuf/gdk-pixbuf-sections.txt: Add new API, remove
	GdkPixbufClass/GdkAnimationClass since those are private

	* gdk-pixbuf/Makefile.am (IGNORE_HFILES): ignore more headers

2000-10-18  Havoc Pennington  <hp@redhat.com>

	* gtk/gtktextiter.c (gtk_text_iter_forward_to_newline): Fix a bug
	where any number of empty lines would get skipped

	* gtk/gtktextiter.h: Remove padding from GtkTextIter; live on the
	edge.

	* gtk/gtktextiter.c (gtk_text_iter_make_surreal): enhance the
	warning about invalid iterators (explain more thoroughly)
	(gtk_text_iter_in_region): rename gtk_text_iter_in_range

	* gtk/gtktextview.c (FOCUS_EDGE_WIDTH): Make focus rectangle less
	big

	* demos/*.c: Add error handling

	* gtk/gtktextbuffer.c: don't modify const iterators

	* gtk/gdk-pixbuf-loader.c: Add full error handling here

	* gtk/gtkimage.c (gtk_image_set_from_file): ignore errors
	on file load

	* gtk/gtkiconfactory.c: Update to reflect addition of error
	handling to gdk-pixbuf loaders

2000-10-16  Havoc Pennington  <hp@redhat.com>

	* gdk-pixbuf-io.c (gdk_pixbuf_get_module)
	(gdk_pixbuf_get_named_module) (gdk_pixbuf_load_module):
	add error reporting here also

	* make-inline-pixbuf.c (main): use GError

	* io-xpm.c: include unistd.h

	* gdk-pixbuf-util.c: include string.h

	* io-*.c: add error reporting

	* gdk-pixbuf-animation.c (gdk_pixbuf_animation_new_from_file): add
	error reporting

	* gdk-pixbuf-io.c (gdk_pixbuf_new_from_file): Add error reporting

	* gdk-pixbuf-io.h: Add GError** to load_increment and load
	methods

	* gdk-pixbuf-io.c (gdk_pixbuf_save) (gdk_pixbuf_savev): return
	a G_FILE_ERROR if we fail to write or close the file.

	* gdk-pixbuf.h: remove GDK_PIXBUF_ERROR_IO, instead we'll use
	G_FILE_ERROR_*. Rename enum to GdkPixbufError, properly following
	the GError naming rules. Add GError** to load functions.
2000-10-18 18:42:54 +00:00

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/* GdkPixbuf library - Windows Bitmap 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-ras.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:
* 4bpp compressed files don't work
* bi-tonal files aren't tested with palettes
*/
#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"
/*
These structures are actually dummies. These are according to
the "Windows API reference guide volume II" as written by
Borland International, but GCC fiddles with the alignment of
the internal members, so these aren't actually usable.
*/
struct BitmapFileHeader {
gushort bfType;
guint bfSize;
guint reserverd;
guint bfOffbits;
};
struct BitmapInfoHeader {
guint biSize;
guint biWidth;
guint biHeight;
gushort biPlanes;
gushort biBitCount;
guint biCompression;
guint biSizeImage;
guint biXPelsPerMeter;
guint biYPelsPerMeter;
guint biClrUsed;
guint biClrImportant;
};
/*
DumpBIH printf's the values in a BitmapInfoHeader to the screen, for
debugging purposes.
*/
#if DUMPBIH
static void DumpBIH(unsigned char *BIH)
{
printf("biSize = %i \n",
(int) (BIH[3] << 24) + (BIH[2] << 16) + (BIH[1] << 8) +
(BIH[0]));
printf("biWidth = %i \n",
(int) (BIH[7] << 24) + (BIH[6] << 16) + (BIH[5] << 8) +
(BIH[4]));
printf("biHeight = %i \n",
(int) (BIH[11] << 24) + (BIH[10] << 16) + (BIH[9] << 8) +
(BIH[8]));
printf("biPlanes = %i \n", (int) (BIH[13] << 8) + (BIH[12]));
printf("biBitCount = %i \n", (int) (BIH[15] << 8) + (BIH[14]));
printf("biCompress = %i \n",
(int) (BIH[19] << 24) + (BIH[18] << 16) + (BIH[17] << 8) +
(BIH[16]));
printf("biSizeImage = %i \n",
(int) (BIH[23] << 24) + (BIH[22] << 16) + (BIH[21] << 8) +
(BIH[20]));
printf("biXPels = %i \n",
(int) (BIH[27] << 24) + (BIH[26] << 16) + (BIH[25] << 8) +
(BIH[24]));
printf("biYPels = %i \n",
(int) (BIH[31] << 24) + (BIH[30] << 16) + (BIH[29] << 8) +
(BIH[28]));
printf("biClrUsed = %i \n",
(int) (BIH[35] << 24) + (BIH[34] << 16) + (BIH[33] << 8) +
(BIH[32]));
printf("biClrImprtnt= %i \n",
(int) (BIH[39] << 24) + (BIH[38] << 16) + (BIH[37] << 8) +
(BIH[36]));
}
#endif
/* struct headerpair contains the decoded width/height/depth info for
the current bitmap */
struct headerpair {
guint width;
guint height;
guint depth;
guint Negative; /* Negative = 1 -> top down BMP,
Negative = 0 -> bottom up BMP */
};
/* Data needed for the "state" during decompression */
struct bmp_compression_state {
gint phase; /* 0 = clean,
1 = count received
2 = escape received
3 = in "raw" run
4 = Relative part 1 is next
5 = Relative part 2 is next
6 = end of image -> No more input allowed
*/
gint RunCount;
gint XDelta;
gint YDelta;
};
/* Progressive loading */
struct bmp_progressive_state {
ModulePreparedNotifyFunc prepared_func;
ModuleUpdatedNotifyFunc 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 Type; /*
32 = RGB + alpha
24 = RGB
4 = 4 bpp colormapped
8 = 8 bpp colormapped
1 = 1 bit bitonal
*/
gint Compressed;
struct bmp_compression_state compr;
struct headerpair Header; /* Decoded (BE->CPU) header */
GdkPixbuf *pixbuf; /* Our "target" */
};
gpointer
gdk_pixbuf__bmp_image_begin_load(ModulePreparedNotifyFunc prepared_func,
ModuleUpdatedNotifyFunc updated_func,
ModuleFrameDoneNotifyFunc frame_done_func,
ModuleAnimationDoneNotifyFunc
anim_done_func, gpointer user_data,
GError **error);
void gdk_pixbuf__bmp_image_stop_load(gpointer data);
gboolean gdk_pixbuf__bmp_image_load_increment(gpointer data, guchar * buf,
guint size,
GError **error);
/* Shared library entry point --> This should be removed when
generic_image_load enters gdk-pixbuf-io. */
GdkPixbuf *gdk_pixbuf__bmp_image_load(FILE * f, GError **error)
{
guchar membuf[4096];
size_t length;
struct bmp_progressive_state *State;
GdkPixbuf *pb;
State =
gdk_pixbuf__bmp_image_begin_load(NULL, NULL, NULL, NULL, NULL,
error);
if (State == NULL)
return NULL;
while (feof(f) == 0) {
length = fread(membuf, 1, 4096, f);
if (length > 0)
if (!gdk_pixbuf__bmp_image_load_increment(State,
membuf,
length,
error)) {
gdk_pixbuf__bmp_image_stop_load (State);
return NULL;
}
}
if (State->pixbuf != NULL)
gdk_pixbuf_ref(State->pixbuf);
pb = State->pixbuf;
gdk_pixbuf__bmp_image_stop_load(State);
return pb;
}
static void DecodeHeader(unsigned char *BFH, unsigned char *BIH,
struct bmp_progressive_state *State)
{
#if DUMPBIH
DumpBIH(BIH);
#endif
State->Header.width =
(int) (BIH[7] << 24) + (BIH[6] << 16) + (BIH[5] << 8) +
(BIH[4]);
State->Header.height =
(int) (BIH[11] << 24) + (BIH[10] << 16) + (BIH[9] << 8) +
(BIH[8]);
State->Header.depth = (int) (BIH[15] << 8) + (BIH[14]);;
State->Type = State->Header.depth; /* This may be less trivial someday */
State->HeaderSize =
(int) ((BFH[13] << 24) + (BFH[12] << 16) + (BFH[11] << 8) +
(BFH[10]));
if (State->HeaderSize >= 14 + 40 + 1024)
State->HeaderBuf =
g_realloc(State->HeaderBuf, State->HeaderSize);
if ((BIH[16] != 0) || (BIH[17] != 0) || (BIH[18] != 0)
|| (BIH[19] != 0)) {
State->Compressed = 1;
}
/* Negative heights indicates bottom-down pixelorder */
if (State->Header.height < 0) {
State->Header.height = -State->Header.height;
State->Header.Negative = 1;
}
if (State->Header.width < 0) {
State->Header.width = -State->Header.width;
State->Header.Negative = 0;
}
if (State->Type == 32)
State->LineWidth = State->Header.width * 4;
if (State->Type == 24)
State->LineWidth = State->Header.width * 3;
if (State->Type == 8)
State->LineWidth = State->Header.width * 1;
if (State->Type == 4)
State->LineWidth = (State->Header.width + 1) / 2;
if (State->Type == 1) {
State->LineWidth = State->Header.width / 8;
if ((State->Header.width & 7) != 0)
State->LineWidth++;
}
/* Pad to a 32 bit boundary */
if (((State->LineWidth % 4) > 0) && (State->Compressed == 0))
State->LineWidth = (State->LineWidth / 4) * 4 + 4;
if (State->LineBuf == NULL)
State->LineBuf = g_malloc(State->LineWidth);
g_assert(State->LineBuf != NULL);
if (State->pixbuf == NULL) {
if (State->Type == 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->prepared_func != NULL)
/* Notify the client that we are ready to go */
(*State->prepared_func) (State->pixbuf, State->user_data);
}
}
/*
* func - called when we have pixmap created (but no image data)
* user_data - passed as arg 1 to func
* return context (opaque to user)
*/
gpointer
gdk_pixbuf__bmp_image_begin_load(ModulePreparedNotifyFunc prepared_func,
ModuleUpdatedNotifyFunc updated_func,
ModuleFrameDoneNotifyFunc frame_done_func,
ModuleAnimationDoneNotifyFunc
anim_done_func, gpointer user_data,
GError **error)
{
struct bmp_progressive_state *context;
context = g_new0(struct bmp_progressive_state, 1);
context->prepared_func = prepared_func;
context->updated_func = updated_func;
context->user_data = user_data;
context->HeaderSize = 54;
context->HeaderBuf = g_malloc(14 + 40 + 1024);
/* 14 for the BitmapFileHeader, 40 for the BitmapImageHeader and
1024 for the colormap */
context->HeaderDone = 0;
context->LineWidth = 0;
context->LineBuf = NULL;
context->LineDone = 0;
context->Lines = 0;
context->Type = 0;
memset(&context->Header, 0, sizeof(struct headerpair));
memset(&context->compr, 0, sizeof(struct bmp_compression_state));
context->pixbuf = NULL;
return (gpointer) context;
}
/*
* context - returned from image_begin_load
*
* free context, unref gdk_pixbuf
*/
void gdk_pixbuf__bmp_image_stop_load(gpointer data)
{
struct bmp_progressive_state *context =
(struct bmp_progressive_state *) data;
g_return_if_fail(context != NULL);
if (context->LineBuf != NULL)
g_free(context->LineBuf);
context->LineBuf = NULL;
if (context->HeaderBuf != NULL)
g_free(context->HeaderBuf);
context->LineBuf = NULL;
if (context->pixbuf)
gdk_pixbuf_unref(context->pixbuf);
g_free(context);
}
/*
The OneLineXX functions are called when 1 line worth of data is present.
OneLine24 is the 24 bpp-version.
*/
static void OneLine32(struct bmp_progressive_state *context)
{
gint X;
guchar *Pixels;
X = 0;
if (context->Header.Negative == 0)
Pixels = (context->pixbuf->pixels +
context->pixbuf->rowstride *
(context->Header.height - context->Lines - 1));
else
Pixels = (context->pixbuf->pixels +
context->pixbuf->rowstride *
context->Lines);
while (X < context->Header.width) {
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 bmp_progressive_state *context)
{
gint X;
guchar *Pixels;
X = 0;
if (context->Header.Negative == 0)
Pixels = (context->pixbuf->pixels +
context->pixbuf->rowstride *
(context->Header.height - context->Lines - 1));
else
Pixels = (context->pixbuf->pixels +
context->pixbuf->rowstride *
context->Lines);
while (X < context->Header.width) {
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 bmp_progressive_state *context)
{
gint X;
guchar *Pixels;
X = 0;
if (context->Header.Negative == 0)
Pixels = (context->pixbuf->pixels +
context->pixbuf->rowstride *
(context->Header.height - context->Lines - 1));
else
Pixels = (context->pixbuf->pixels +
context->pixbuf->rowstride *
context->Lines);
while (X < context->Header.width) {
Pixels[X * 3 + 0] =
context->HeaderBuf[4 * context->LineBuf[X] + 56];
Pixels[X * 3 + 1] =
context->HeaderBuf[4 * context->LineBuf[X] + 55];
Pixels[X * 3 + 2] =
context->HeaderBuf[4 * context->LineBuf[X] + 54];
X++;
}
}
static void OneLine4(struct bmp_progressive_state *context)
{
gint X;
guchar *Pixels;
X = 0;
if (context->Header.Negative == 0)
Pixels = (context->pixbuf->pixels +
context->pixbuf->rowstride *
(context->Header.height - context->Lines - 1));
else
Pixels = (context->pixbuf->pixels +
context->pixbuf->rowstride *
context->Lines);
while (X < context->Header.width) {
guchar Pix;
Pix = context->LineBuf[X / 2];
Pixels[X * 3 + 0] =
context->HeaderBuf[4 * (Pix >> 4) + 56];
Pixels[X * 3 + 1] =
context->HeaderBuf[4 * (Pix >> 4) + 55];
Pixels[X * 3 + 2] =
context->HeaderBuf[4 * (Pix >> 4) + 54];
X++;
if (X < context->Header.width) {
/* Handle the other 4 bit pixel only when there is one */
Pixels[X * 3 + 0] =
context->HeaderBuf[4 * (Pix & 15) + 56];
Pixels[X * 3 + 1] =
context->HeaderBuf[4 * (Pix & 15) + 55];
Pixels[X * 3 + 2] =
context->HeaderBuf[4 * (Pix & 15) + 54];
X++;
}
}
}
static void OneLine1(struct bmp_progressive_state *context)
{
gint X;
guchar *Pixels;
X = 0;
if (context->Header.Negative == 0)
Pixels = (context->pixbuf->pixels +
context->pixbuf->rowstride *
(context->Header.height - context->Lines - 1));
else
Pixels = (context->pixbuf->pixels +
context->pixbuf->rowstride *
context->Lines);
while (X < context->Header.width) {
gint Bit;
Bit = (context->LineBuf[X / 8]) >> (7 - (X & 7));
Bit = Bit & 1;
Pixels[X * 3 + 0] = Bit * 255;
Pixels[X * 3 + 1] = Bit * 255;
Pixels[X * 3 + 2] = Bit * 255;
X++;
}
}
static void OneLine(struct bmp_progressive_state *context)
{
context->LineDone = 0;
if (context->Lines >= context->Header.height)
return;
if (context->Type == 32)
OneLine32(context);
if (context->Type == 24)
OneLine24(context);
if (context->Type == 8)
OneLine8(context);
if (context->Type == 4)
OneLine4(context);
if (context->Type == 1)
OneLine1(context);
context->Lines++;
if (context->updated_func != NULL) {
(*context->updated_func) (context->pixbuf,
0,
context->Lines,
context->Header.width,
context->Header.height,
context->user_data);
}
}
/* DoCompressedByte handles 1 byte of incomming compressed data */
void DoCompressedByte(struct bmp_progressive_state *context, guchar ** buf,
gint * size)
{
gint BytesToCopy;
switch (context->compr.phase) {
case 0: /* Neutral state */
if ((*buf)[0] != 0) { /* run count */
context->compr.phase = 1;
context->compr.RunCount = (*buf)[0];
} else { /* Escape */
context->compr.phase = 2;
}
(*buf)++;
(*size)--;
break;
case 1: /* Run count received.... */
while (context->compr.RunCount > 0) {
BytesToCopy =
context->LineWidth - context->LineDone;
if (BytesToCopy > context->compr.RunCount)
BytesToCopy = context->compr.RunCount;
if (BytesToCopy > 0) {
memset(context->LineBuf +
context->LineDone, (*buf)[0],
BytesToCopy);
context->compr.RunCount -= BytesToCopy;
context->LineDone += BytesToCopy;
}
if ((context->LineDone >= context->LineWidth)
&& (context->LineWidth > 0)) {
OneLine(context);
}
}
context->compr.phase = 0;
(*buf)++;
(*size)--;
break;
case 2: /* Escape received */
if ((*buf)[0] == 0) { /* End of line */
context->compr.phase = 0;
if (context->LineDone > 0)
OneLine(context);
} else if ((*buf)[0] == 1) { /* End of image */
OneLine(context);
context->compr.phase = 6;
(*size) = 0;
break;
} else if ((*buf)[0] == 2) { /* Cursor displacement */
context->compr.phase = 4;
} else {
context->compr.phase = 3;
context->compr.RunCount = (*buf)[0];
if (context->compr.RunCount & 1)
context->compr.phase = 7;
}
(*buf)++;
(*size)--;
break;
case 3:
while ((context->compr.RunCount > 0)
&& (*size > 0)) {
BytesToCopy =
context->LineWidth - context->LineDone;
if (BytesToCopy > context->compr.RunCount)
BytesToCopy = context->compr.RunCount;
if (BytesToCopy > *size)
BytesToCopy = *size;
if (BytesToCopy > 0) {
memcpy(context->LineBuf +
context->LineDone, *buf,
BytesToCopy);
context->compr.RunCount -= BytesToCopy;
(*buf) += BytesToCopy;
(*size) -= BytesToCopy;
context->LineDone += BytesToCopy;
}
if ((context->LineDone >= context->LineWidth)
&& (context->LineWidth > 0))
OneLine(context);
}
if (context->compr.RunCount <= 0)
context->compr.phase = 0;
break;
case 4:
context->compr.phase = 5;
context->compr.XDelta = (*buf)[0];
(*buf)++;
(*size)--;
break;
case 5:
context->compr.phase = 0;
context->compr.YDelta = (*buf)[0];
g_assert(0); /* No implementatio of this yet */
/* If this happens, please email me (arjan@fenrus.demon.nl)
the image concerned. */
(*buf)++;
(*size)--;
break;
case 6:
(*size) = 0;
break;
case 7: /* Odd raw run */
while ((context->compr.RunCount > 0) && (*size > 0)) {
BytesToCopy =
context->LineWidth - context->LineDone;
if (BytesToCopy > context->compr.RunCount)
BytesToCopy = context->compr.RunCount;
if (BytesToCopy > *size)
BytesToCopy = *size;
if (BytesToCopy > 0) {
memcpy(context->LineBuf +
context->LineDone, *buf,
BytesToCopy);
context->compr.RunCount -= BytesToCopy;
(*buf) += BytesToCopy;
(*size) -= BytesToCopy;
context->LineDone += BytesToCopy;
}
if ((context->LineDone >= context->LineWidth)
&& (context->LineWidth > 0))
OneLine(context);
}
if (context->compr.RunCount <= 0)
context->compr.phase = 8;
break;
case 8: /* Eat dummy byte; */
(*buf)++;
(*size)--;
context->compr.phase = 0;
break;
}
}
/*
* context - from image_begin_load
* buf - new image data
* size - length of new image data
*
* append image data onto inrecrementally built output image
*/
gboolean gdk_pixbuf__bmp_image_load_increment(gpointer data,
guchar * buf,
guint size,
GError **error)
{
struct bmp_progressive_state *context =
(struct bmp_progressive_state *) data;
gint BytesToCopy;
while (size > 0) {
g_assert(context->LineDone >= 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->Compressed) {
/* Compression is done 1 byte at a time for now */
DoCompressedByte(context, &buf, &size);
} else {
/* Uncompressed pixeldata */
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 >= 14 + 40)
DecodeHeader(context->HeaderBuf,
context->HeaderBuf + 14, context);
}
return TRUE;
}