forked from AuroraMiddleware/gtk
ab13c8803d
2001-11-21 Federico Mena Quintero <federico@ximian.com> Fix Ximian bug #12125; merged from gdk-pixbuf stable. * gdk-pixbuf/io-bmp.c (gdk_pixbuf__bmp_image_load_increment): Use a simple state machine instead of a scary if/else chain. (DecodeHeader): Set the reading state. (DecodeColormap): Set the reading state. (decode_bitmasks): New function, decodes the bitmasks for BI_BITFIELDS coding. (OneLine32): Handle BI_BITFIELDS coding. (OneLine16): Likewise.
1006 lines
27 KiB
C
1006 lines
27 KiB
C
/* GdkPixbuf library - Windows Bitmap image loader
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*
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* Copyright (C) 1999 The Free Software Foundation
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*
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* Authors: Arjan van de Ven <arjan@fenrus.demon.nl>
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* Federico Mena-Quintero <federico@gimp.org>
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*
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* Based on io-ras.c
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <config.h>
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#include <stdio.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <string.h>
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#include "gdk-pixbuf-private.h"
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#include "gdk-pixbuf-io.h"
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#if 0
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/* If these structures were unpacked, they would define the two headers of the
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* BMP file. After them comes the palette, and then the image data.
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*
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* We do not use these structures; we just keep them here for reference.
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*/
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struct BitmapFileHeader {
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guint16 magic;
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guint32 file_size;
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guint32 reserved;
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guint32 data_offset;
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};
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struct BitmapInfoHeader {
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guint32 header_size;
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guint32 width;
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guint32 height;
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guint16 planes;
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guint16 bpp;
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guint32 compression;
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guint32 data_size;
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guint32 x_ppm;
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guint32 y_ppm;
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guint32 n_colors;
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guint32 n_important_colors;
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};
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#endif
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/* Compression values */
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#define BI_RGB 0
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#define BI_RLE8 1
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#define BI_RLE4 2
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#define BI_BITFIELDS 3
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/* State machine */
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typedef enum {
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READ_STATE_HEADERS, /* Reading the bitmap file header and bitmap info header */
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READ_STATE_PALETTE, /* Reading the palette */
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READ_STATE_BITMASKS, /* Reading the bitmasks for BI_BITFIELDS */
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READ_STATE_DATA, /* Reading the actual image data */
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READ_STATE_ERROR, /* An error occurred; further data will be ignored */
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READ_STATE_DONE /* Done reading the image; further data will be ignored */
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} ReadState;
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/*
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DumpBIH printf's the values in a BitmapInfoHeader to the screen, for
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debugging purposes.
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*/
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#if DUMPBIH
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static void DumpBIH(unsigned char *BIH)
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{
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printf("biSize = %i \n",
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(int) (BIH[3] << 24) + (BIH[2] << 16) + (BIH[1] << 8) +
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(BIH[0]));
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printf("biWidth = %i \n",
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(int) (BIH[7] << 24) + (BIH[6] << 16) + (BIH[5] << 8) +
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(BIH[4]));
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printf("biHeight = %i \n",
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(int) (BIH[11] << 24) + (BIH[10] << 16) + (BIH[9] << 8) +
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(BIH[8]));
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printf("biPlanes = %i \n", (int) (BIH[13] << 8) + (BIH[12]));
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printf("biBitCount = %i \n", (int) (BIH[15] << 8) + (BIH[14]));
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printf("biCompress = %i \n",
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(int) (BIH[19] << 24) + (BIH[18] << 16) + (BIH[17] << 8) +
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(BIH[16]));
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printf("biSizeImage = %i \n",
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(int) (BIH[23] << 24) + (BIH[22] << 16) + (BIH[21] << 8) +
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(BIH[20]));
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printf("biXPels = %i \n",
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(int) (BIH[27] << 24) + (BIH[26] << 16) + (BIH[25] << 8) +
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(BIH[24]));
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printf("biYPels = %i \n",
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(int) (BIH[31] << 24) + (BIH[30] << 16) + (BIH[29] << 8) +
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(BIH[28]));
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printf("biClrUsed = %i \n",
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(int) (BIH[35] << 24) + (BIH[34] << 16) + (BIH[33] << 8) +
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(BIH[32]));
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printf("biClrImprtnt= %i \n",
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(int) (BIH[39] << 24) + (BIH[38] << 16) + (BIH[37] << 8) +
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(BIH[36]));
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}
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#endif
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/* struct headerpair contains the decoded width/height/depth info for
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the current bitmap */
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struct headerpair {
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guint32 size;
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gint32 width;
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gint32 height;
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guint depth;
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guint Negative; /* Negative = 1 -> top down BMP,
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Negative = 0 -> bottom up BMP */
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};
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/* Data needed for the "state" during decompression */
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struct bmp_compression_state {
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gint phase;
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gint RunCount;
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guchar *linebuff;
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gint linebuffsize; /* these two counts in nibbles */
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gint linebuffdone;
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};
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/* Progressive loading */
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struct bmp_progressive_state {
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ModulePreparedNotifyFunc prepared_func;
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ModuleUpdatedNotifyFunc updated_func;
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gpointer user_data;
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ReadState read_state;
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guint LineWidth;
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guint Lines; /* # of finished lines */
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guchar *buff;
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gint BufferSize;
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gint BufferDone;
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guchar (*Colormap)[3];
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gint Type; /*
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32 = RGB + alpha
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24 = RGB
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16 = RGB
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4 = 4 bpp colormapped
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8 = 8 bpp colormapped
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1 = 1 bit bitonal
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*/
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gint Compressed;
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struct bmp_compression_state compr;
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struct headerpair Header; /* Decoded (BE->CPU) header */
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/* Bit masks, shift amounts, and significant bits for BI_BITFIELDS coding */
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int r_mask, r_shift, r_bits;
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int g_mask, g_shift, g_bits;
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int b_mask, b_shift, b_bits;
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GdkPixbuf *pixbuf; /* Our "target" */
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};
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static gpointer
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gdk_pixbuf__bmp_image_begin_load(ModulePreparedNotifyFunc prepared_func,
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ModuleUpdatedNotifyFunc updated_func,
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gpointer user_data,
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GError **error);
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static gboolean gdk_pixbuf__bmp_image_stop_load(gpointer data, GError **error);
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static gboolean gdk_pixbuf__bmp_image_load_increment(gpointer data,
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const guchar * buf,
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guint size,
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GError **error);
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/* Shared library entry point --> This should be removed when
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generic_image_load enters gdk-pixbuf-io. */
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static GdkPixbuf *gdk_pixbuf__bmp_image_load(FILE * f, GError **error)
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{
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guchar membuf[4096];
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size_t length;
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struct bmp_progressive_state *State;
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GdkPixbuf *pb;
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State =
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gdk_pixbuf__bmp_image_begin_load(NULL, NULL, NULL,
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error);
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if (State == NULL)
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return NULL;
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while (feof(f) == 0) {
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length = fread(membuf, 1, sizeof (membuf), f);
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if (length > 0)
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if (!gdk_pixbuf__bmp_image_load_increment(State,
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membuf,
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length,
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error)) {
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gdk_pixbuf__bmp_image_stop_load (State, NULL);
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return NULL;
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}
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}
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if (State->pixbuf != NULL)
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gdk_pixbuf_ref(State->pixbuf);
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pb = State->pixbuf;
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gdk_pixbuf__bmp_image_stop_load(State, NULL);
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return pb;
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}
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static gboolean DecodeHeader(unsigned char *BFH, unsigned char *BIH,
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struct bmp_progressive_state *State,
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GError **error)
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{
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/* FIXME this is totally unrobust against bogus image data. */
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if (State->BufferSize < GUINT32_FROM_LE (* (guint32 *) &BIH[0]) + 14) {
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State->BufferSize = GUINT32_FROM_LE (* (guint32 *) &BIH[0]) + 14;
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State->buff = g_realloc (State->buff, State->BufferSize);
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return TRUE;
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}
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#if DUMPBIH
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DumpBIH(BIH);
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#endif
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State->Header.size = GUINT32_FROM_LE (* (guint32 *) &BIH[0]);
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if (State->Header.size == 40) {
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State->Header.width = GINT32_FROM_LE (* (gint32 *) &BIH[4]);
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State->Header.height = GINT32_FROM_LE (* (gint32 *) &BIH[8]);
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State->Header.depth = GUINT16_FROM_LE (* (guint16 *) &BIH[14]);
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State->Compressed = GUINT32_FROM_LE (* (guint32 *) &BIH[16]);
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} else if (State->Header.size == 12) {
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State->Header.width = GUINT16_FROM_LE (* (guint16 *) &BIH[4]);
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State->Header.height = GUINT16_FROM_LE (* (guint16 *) &BIH[6]);
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State->Header.depth = GUINT16_FROM_LE (* (guint16 *) &BIH[10]);
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State->Compressed = BI_RGB;
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} else {
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g_set_error (error,
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GDK_PIXBUF_ERROR,
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GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
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_("BMP image has unsupported header size"));
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State->read_state = READ_STATE_ERROR;
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return FALSE;
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}
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State->Type = State->Header.depth; /* This may be less trivial someday */
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/* Negative heights indicates bottom-down pixelorder */
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if (State->Header.height < 0) {
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State->Header.height = -State->Header.height;
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State->Header.Negative = 1;
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}
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if (State->Header.width < 0) {
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State->Header.width = -State->Header.width;
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State->Header.Negative = 0;
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}
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if (State->Header.width == 0 || State->Header.height == 0 ||
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(State->Compressed == BI_RLE4 && State->Type != 4) ||
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(State->Compressed == BI_RLE8 && State->Type != 8) ||
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(State->Compressed == BI_BITFIELDS && !(State->Type == 16 || State->Type == 32)) ||
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State->Compressed > BI_BITFIELDS) {
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g_set_error (error,
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GDK_PIXBUF_ERROR,
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GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
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_("BMP image has bogus header data"));
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State->read_state = READ_STATE_ERROR;
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return FALSE;
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}
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if (State->Type == 32)
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State->LineWidth = State->Header.width * 4;
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else if (State->Type == 24)
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State->LineWidth = State->Header.width * 3;
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else if (State->Type == 16)
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State->LineWidth = State->Header.width * 2;
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else if (State->Type == 8)
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State->LineWidth = State->Header.width * 1;
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else if (State->Type == 4)
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State->LineWidth = (State->Header.width + 1) / 2;
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else if (State->Type == 1) {
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State->LineWidth = State->Header.width / 8;
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if ((State->Header.width & 7) != 0)
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State->LineWidth++;
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} else {
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g_set_error (error,
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GDK_PIXBUF_ERROR,
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GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
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_("BMP image has bogus header data"));
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State->read_state = READ_STATE_ERROR;
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return FALSE;
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}
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/* Pad to a 32 bit boundary */
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if (((State->LineWidth % 4) > 0)
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&& (State->Compressed == BI_RGB || State->Compressed == BI_BITFIELDS))
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State->LineWidth = (State->LineWidth / 4) * 4 + 4;
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if (State->pixbuf == NULL) {
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if (State->Type == 32)
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State->pixbuf =
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gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8,
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(gint) State->Header.width,
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(gint) State->Header.height);
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else
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State->pixbuf =
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gdk_pixbuf_new(GDK_COLORSPACE_RGB, FALSE, 8,
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(gint) State->Header.width,
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(gint) State->Header.height);
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if (State->pixbuf == NULL) {
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g_set_error (error,
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GDK_PIXBUF_ERROR,
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GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
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_("Not enough memory to load bitmap image"));
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State->read_state = READ_STATE_ERROR;
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return FALSE;
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}
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if (State->prepared_func != NULL)
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/* Notify the client that we are ready to go */
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(*State->prepared_func) (State->pixbuf, NULL, State->user_data);
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}
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if (!(State->Compressed == BI_RGB || State->Compressed == BI_BITFIELDS)) {
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State->compr.linebuffdone = 0;
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State->compr.linebuffsize = State->Header.width;
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if (State->Type == 8)
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State->compr.linebuffsize *= 2;
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State->compr.linebuff = g_malloc ((State->compr.linebuffsize + 1) / 2);
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}
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State->BufferDone = 0;
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if (State->Type <= 8) {
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State->read_state = READ_STATE_PALETTE;
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State->BufferSize = GUINT32_FROM_LE (* (guint32 *) &BFH[10]) - 14 - State->Header.size;
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} else if (State->Compressed == BI_RGB) {
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State->read_state = READ_STATE_DATA;
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State->BufferSize = State->LineWidth;
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} else if (State->Compressed == BI_BITFIELDS) {
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State->read_state = READ_STATE_BITMASKS;
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State->BufferSize = 12;
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} else
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g_assert_not_reached ();
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State->buff = g_realloc (State->buff, State->BufferSize);
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return TRUE;
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}
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static void DecodeColormap (guchar *buff,
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struct bmp_progressive_state *State,
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GError **error)
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{
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gint i;
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g_assert (State->read_state == READ_STATE_PALETTE);
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State->Colormap = g_malloc ((1 << State->Header.depth) * sizeof (*State->Colormap));
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for (i = 0; i < (1 << State->Header.depth); i++)
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{
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State->Colormap[i][0] = buff[i * (State->Header.size == 12 ? 3 : 4)];
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State->Colormap[i][1] = buff[i * (State->Header.size == 12 ? 3 : 4) + 1];
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State->Colormap[i][2] = buff[i * (State->Header.size == 12 ? 3 : 4) + 2];
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}
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State->read_state = READ_STATE_DATA;
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State->BufferDone = 0;
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if (!(State->Compressed == BI_RGB || State->Compressed == BI_BITFIELDS))
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State->BufferSize = 2;
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else
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State->BufferSize = State->LineWidth;
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State->buff = g_realloc (State->buff, State->BufferSize);
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}
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/* Finds the lowest set bit and the number of set bits */
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static void
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find_bits (int n, int *lowest, int *n_set)
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{
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int i;
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*n_set = 0;
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for (i = 31; i >= 0; i--)
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if (n & (1 << i)) {
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*lowest = i;
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(*n_set)++;
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}
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}
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/* Decodes the 3 shorts that follow for the bitmasks for BI_BITFIELDS coding */
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static void
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decode_bitmasks (struct bmp_progressive_state *State, guchar *buf)
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{
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State->r_mask = buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
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buf += 4;
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State->g_mask = buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
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buf += 4;
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State->b_mask = buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
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find_bits (State->r_mask, &State->r_shift, &State->r_bits);
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find_bits (State->g_mask, &State->g_shift, &State->g_bits);
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find_bits (State->b_mask, &State->b_shift, &State->b_bits);
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if (State->r_bits == 0 || State->g_bits == 0 || State->b_bits == 0) {
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State->r_mask = 0x7c00;
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State->r_shift = 10;
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State->g_mask = 0x03e0;
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State->g_shift = 5;
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State->b_mask = 0x001f;
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State->b_shift = 0;
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State->r_bits = State->g_bits = State->b_bits = 5;
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}
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State->read_state = READ_STATE_DATA;
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State->BufferDone = 0;
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State->BufferSize = State->LineWidth;
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State->buff = g_realloc (State->buff, State->BufferSize);
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}
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/*
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* func - called when we have pixmap created (but no image data)
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* user_data - passed as arg 1 to func
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* return context (opaque to user)
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*/
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static gpointer
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gdk_pixbuf__bmp_image_begin_load(ModulePreparedNotifyFunc prepared_func,
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ModuleUpdatedNotifyFunc updated_func,
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gpointer user_data,
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GError **error)
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{
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struct bmp_progressive_state *context;
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context = g_new0(struct bmp_progressive_state, 1);
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context->prepared_func = prepared_func;
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context->updated_func = updated_func;
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context->user_data = user_data;
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context->read_state = READ_STATE_HEADERS;
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context->BufferSize = 26;
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context->buff = g_malloc(26);
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context->BufferDone = 0;
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/* 14 for the BitmapFileHeader, 12 for the BitmapImageHeader */
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context->Colormap = NULL;
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context->Lines = 0;
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||
|
||
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
|
||
*/
|
||
static gboolean gdk_pixbuf__bmp_image_stop_load(gpointer data, GError **error)
|
||
{
|
||
struct bmp_progressive_state *context =
|
||
(struct bmp_progressive_state *) data;
|
||
|
||
/* FIXME this thing needs to report errors if
|
||
* we have unused image data
|
||
*/
|
||
|
||
g_return_val_if_fail(context != NULL, TRUE);
|
||
|
||
if (context->compr.linebuff != NULL)
|
||
g_free(context->compr.linebuff);
|
||
|
||
if (context->Colormap != NULL)
|
||
g_free(context->Colormap);
|
||
|
||
if (context->pixbuf)
|
||
gdk_pixbuf_unref(context->pixbuf);
|
||
|
||
g_free(context->buff);
|
||
g_free(context);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
|
||
/*
|
||
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; int i;
|
||
guchar *pixels;
|
||
guchar *src;
|
||
|
||
if (!context->Header.Negative)
|
||
pixels = (context->pixbuf->pixels +
|
||
context->pixbuf->rowstride * (context->Header.height - context->Lines - 1));
|
||
else
|
||
pixels = (context->pixbuf->pixels +
|
||
context->pixbuf->rowstride * context->Lines);
|
||
|
||
src = context->buff;
|
||
|
||
if (context->Compressed == BI_BITFIELDS) {
|
||
int r_lshift, r_rshift;
|
||
int g_lshift, g_rshift;
|
||
int b_lshift, b_rshift;
|
||
|
||
r_lshift = 8 - context->r_bits;
|
||
g_lshift = 8 - context->g_bits;
|
||
b_lshift = 8 - context->b_bits;
|
||
|
||
r_rshift = context->r_bits - r_lshift;
|
||
g_rshift = context->g_bits - g_lshift;
|
||
b_rshift = context->b_bits - b_lshift;
|
||
|
||
for (i = 0; i < context->Header.width; i++) {
|
||
int v, r, g, b;
|
||
|
||
v = src[0] | (src[1] << 8) | (src[2] << 16);
|
||
|
||
r = (v & context->r_mask) >> context->r_shift;
|
||
g = (v & context->g_mask) >> context->g_shift;
|
||
b = (v & context->b_mask) >> context->b_shift;
|
||
|
||
*pixels++ = (r << r_lshift) | (r >> r_rshift);
|
||
*pixels++ = (g << g_lshift) | (g >> g_rshift);
|
||
*pixels++ = (b << b_lshift) | (b >> b_rshift);
|
||
*pixels++ = src[3]; /* alpha */
|
||
|
||
src += 4;
|
||
}
|
||
} else
|
||
for (i = 0; i < context->Header.width; i++) {
|
||
*pixels++ = src[2];
|
||
*pixels++ = src[1];
|
||
*pixels++ = src[0];
|
||
*pixels++ = src[3];
|
||
|
||
src += 4;
|
||
}
|
||
}
|
||
|
||
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->buff[X * 3 + 2];
|
||
Pixels[X * 3 + 1] = context->buff[X * 3 + 1];
|
||
Pixels[X * 3 + 2] = context->buff[X * 3 + 0];
|
||
X++;
|
||
}
|
||
|
||
}
|
||
|
||
static void OneLine16(struct bmp_progressive_state *context)
|
||
{
|
||
int i;
|
||
guchar *pixels;
|
||
guchar *src;
|
||
|
||
if (!context->Header.Negative)
|
||
pixels = (context->pixbuf->pixels +
|
||
context->pixbuf->rowstride * (context->Header.height - context->Lines - 1));
|
||
else
|
||
pixels = (context->pixbuf->pixels +
|
||
context->pixbuf->rowstride * context->Lines);
|
||
|
||
src = context->buff;
|
||
|
||
if (context->Compressed == BI_BITFIELDS) {
|
||
int r_lshift, r_rshift;
|
||
int g_lshift, g_rshift;
|
||
int b_lshift, b_rshift;
|
||
|
||
r_lshift = 8 - context->r_bits;
|
||
g_lshift = 8 - context->g_bits;
|
||
b_lshift = 8 - context->b_bits;
|
||
|
||
r_rshift = context->r_bits - r_lshift;
|
||
g_rshift = context->g_bits - g_lshift;
|
||
b_rshift = context->b_bits - b_lshift;
|
||
|
||
for (i = 0; i < context->Header.width; i++) {
|
||
int v, r, g, b;
|
||
|
||
v = (int) src[0] | ((int) src[1] << 8);
|
||
|
||
r = (v & context->r_mask) >> context->r_shift;
|
||
g = (v & context->g_mask) >> context->g_shift;
|
||
b = (v & context->b_mask) >> context->b_shift;
|
||
|
||
*pixels++ = (r << r_lshift) | (r >> r_rshift);
|
||
*pixels++ = (g << g_lshift) | (g >> g_rshift);
|
||
*pixels++ = (b << b_lshift) | (b >> b_rshift);
|
||
|
||
src += 2;
|
||
}
|
||
} else
|
||
for (i = 0; i < context->Header.width; i++) {
|
||
int v, r, g, b;
|
||
|
||
v = src[0] | (src[1] << 8);
|
||
|
||
r = (v >> 10) & 0x1f;
|
||
g = (v >> 5) & 0x1f;
|
||
b = v & 0x1f;
|
||
|
||
*pixels++ = (r << 3) | (r >> 2);
|
||
*pixels++ = (g << 3) | (g >> 2);
|
||
*pixels++ = (b << 3) | (b >> 2);
|
||
}
|
||
}
|
||
|
||
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->Colormap[context->buff[X]][2];
|
||
Pixels[X * 3 + 1] =
|
||
context->Colormap[context->buff[X]][1];
|
||
Pixels[X * 3 + 2] =
|
||
context->Colormap[context->buff[X]][0];
|
||
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->buff[X / 2];
|
||
|
||
Pixels[X * 3 + 0] =
|
||
context->Colormap[Pix >> 4][2];
|
||
Pixels[X * 3 + 1] =
|
||
context->Colormap[Pix >> 4][1];
|
||
Pixels[X * 3 + 2] =
|
||
context->Colormap[Pix >> 4][0];
|
||
X++;
|
||
if (X < context->Header.width) {
|
||
/* Handle the other 4 bit pixel only when there is one */
|
||
Pixels[X * 3 + 0] =
|
||
context->Colormap[Pix & 15][2];
|
||
Pixels[X * 3 + 1] =
|
||
context->Colormap[Pix & 15][1];
|
||
Pixels[X * 3 + 2] =
|
||
context->Colormap[Pix & 15][0];
|
||
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->buff[X / 8]) >> (7 - (X & 7));
|
||
Bit = Bit & 1;
|
||
Pixels[X * 3 + 0] = context->Colormap[Bit][2];
|
||
Pixels[X * 3 + 1] = context->Colormap[Bit][1];
|
||
Pixels[X * 3 + 2] = context->Colormap[Bit][0];
|
||
X++;
|
||
}
|
||
}
|
||
|
||
|
||
static void OneLine(struct bmp_progressive_state *context)
|
||
{
|
||
context->BufferDone = 0;
|
||
if (context->Lines >= context->Header.height)
|
||
return;
|
||
|
||
if (context->Type == 32)
|
||
OneLine32(context);
|
||
else if (context->Type == 24)
|
||
OneLine24(context);
|
||
else if (context->Type == 16)
|
||
OneLine16(context);
|
||
else if (context->Type == 8)
|
||
OneLine8(context);
|
||
else if (context->Type == 4)
|
||
OneLine4(context);
|
||
else if (context->Type == 1)
|
||
OneLine1(context);
|
||
else
|
||
g_assert_not_reached ();
|
||
|
||
context->Lines++;
|
||
|
||
if (context->updated_func != NULL) {
|
||
(*context->updated_func) (context->pixbuf,
|
||
0,
|
||
context->Lines,
|
||
context->Header.width,
|
||
1,
|
||
context->user_data);
|
||
|
||
}
|
||
}
|
||
|
||
static void
|
||
DoCompressed(struct bmp_progressive_state *context)
|
||
{
|
||
gint count, pos;
|
||
switch (context->compr.phase) {
|
||
case 0: /* Neutral state */
|
||
if (context->buff[0] != 0) { /* run count */
|
||
context->compr.RunCount = context->buff[0];
|
||
if (context->Type == 8)
|
||
context->compr.RunCount *= 2;
|
||
while (context->compr.RunCount > 0) {
|
||
if (context->compr.linebuffdone & 1) {
|
||
guchar *ptr = context->compr.linebuff +
|
||
context->compr.linebuffdone / 2;
|
||
|
||
*ptr = (*ptr & 0xF0) | (context->buff[1] >> 4);
|
||
context->buff[1] = (context->buff[1] << 4) |
|
||
(context->buff[1] >> 4);
|
||
context->compr.linebuffdone++;
|
||
context->compr.RunCount--;
|
||
}
|
||
|
||
if (context->compr.RunCount) {
|
||
count = context->compr.linebuffsize -
|
||
context->compr.linebuffdone;
|
||
if (count > context->compr.RunCount)
|
||
count = context->compr.RunCount;
|
||
|
||
memset (context->compr.linebuff +
|
||
context->compr.linebuffdone / 2,
|
||
context->buff[1],
|
||
(count + 1) / 2);
|
||
context->compr.RunCount -= count;
|
||
context->compr.linebuffdone += count;
|
||
}
|
||
if (context->compr.linebuffdone == context->compr.linebuffsize) {
|
||
guchar *tmp = context->buff;
|
||
context->buff = context->compr.linebuff;
|
||
OneLine (context);
|
||
context->buff = tmp;
|
||
|
||
if (context->compr.linebuffdone & 1)
|
||
context->buff[1] = (context->buff[1] << 4) |
|
||
(context->buff[1] >> 4);
|
||
context->compr.linebuffdone = 0;
|
||
}
|
||
}
|
||
} else { /* Escape */
|
||
if (context->buff[1] == 0) { /* End of line */
|
||
if (context->compr.linebuffdone) {
|
||
guchar *tmp = context->buff;
|
||
context->buff = context->compr.linebuff;
|
||
OneLine (context);
|
||
context->buff = tmp;
|
||
|
||
context->compr.linebuffdone = 0;
|
||
}
|
||
} else if (context->buff[1] == 1) { /* End of image */
|
||
if (context->compr.linebuffdone) {
|
||
guchar *tmp = context->buff;
|
||
context->buff = context->compr.linebuff;
|
||
OneLine (context);
|
||
context->buff = tmp;
|
||
}
|
||
|
||
context->compr.phase = 2;
|
||
} else if (context->buff[1] == 2) /* Cursor displacement */
|
||
; /* not implemented */
|
||
else {
|
||
context->compr.phase = 1;
|
||
context->compr.RunCount = context->buff[1];
|
||
if (context->Type == 8)
|
||
context->compr.RunCount *= 2;
|
||
context->BufferSize = (context->compr.RunCount + 3) / 4 * 2;
|
||
context->buff = g_realloc (context->buff, context->BufferSize);
|
||
}
|
||
}
|
||
context->BufferDone = 0;
|
||
break;
|
||
case 1:
|
||
pos = 0;
|
||
while (pos < context->compr.RunCount) {
|
||
count = context->compr.linebuffsize - context->compr.linebuffdone;
|
||
if (count > context->compr.RunCount)
|
||
count = context->compr.RunCount;
|
||
|
||
if ((context->compr.linebuffdone & 1) || (pos & 1)) {
|
||
gint i, newval;
|
||
guchar *ptr;
|
||
for (i = 0; i < count; i++) {
|
||
ptr = context->compr.linebuff + (i +
|
||
context->compr.linebuffdone) / 2;
|
||
newval = *(context->buff + (pos + i) / 2) & (0xf0 >> (((pos + i) % 2) * 4));
|
||
if (((pos + i) % 2) ^ ((context->compr.linebuffdone + i) % 2)) {
|
||
if ((pos + i) % 2)
|
||
newval <<= 4;
|
||
else
|
||
newval >>= 4;
|
||
}
|
||
*ptr = (*ptr & (0xf << (((i + context->compr.linebuffdone) % 2) * 4))) | newval;
|
||
}
|
||
} else {
|
||
memmove (context->compr.linebuff +
|
||
context->compr.linebuffdone / 2,
|
||
context->buff + pos / 2,
|
||
(count + 1) / 2);
|
||
}
|
||
pos += count;
|
||
context->compr.linebuffdone += count;
|
||
if (context->compr.linebuffdone == context->compr.linebuffsize) {
|
||
guchar *tmp = context->buff;
|
||
context->buff = context->compr.linebuff;
|
||
OneLine (context);
|
||
context->buff = tmp;
|
||
|
||
context->compr.linebuffdone = 0;
|
||
}
|
||
}
|
||
context->compr.phase = 0;
|
||
context->BufferSize = 2;
|
||
context->buff = g_realloc (context->buff, context->BufferSize);
|
||
context->BufferDone = 0;
|
||
break;
|
||
case 2:
|
||
context->BufferDone = 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
|
||
*/
|
||
static gboolean
|
||
gdk_pixbuf__bmp_image_load_increment(gpointer data,
|
||
const guchar * buf,
|
||
guint size,
|
||
GError **error)
|
||
{
|
||
struct bmp_progressive_state *context =
|
||
(struct bmp_progressive_state *) data;
|
||
|
||
gint BytesToCopy;
|
||
|
||
if (context->read_state == READ_STATE_DONE)
|
||
return TRUE;
|
||
else if (context->read_state == READ_STATE_ERROR)
|
||
return FALSE;
|
||
|
||
while (size > 0) {
|
||
if (context->BufferDone < context->BufferSize) { /* We still
|
||
have headerbytes to do */
|
||
BytesToCopy =
|
||
context->BufferSize - context->BufferDone;
|
||
if (BytesToCopy > size)
|
||
BytesToCopy = size;
|
||
|
||
memmove(context->buff + context->BufferDone,
|
||
buf, BytesToCopy);
|
||
|
||
size -= BytesToCopy;
|
||
buf += BytesToCopy;
|
||
context->BufferDone += BytesToCopy;
|
||
|
||
if (context->BufferDone != context->BufferSize)
|
||
break;
|
||
}
|
||
|
||
switch (context->read_state) {
|
||
case READ_STATE_HEADERS:
|
||
if (!DecodeHeader (context->buff, context->buff + 14, context))
|
||
return FALSE;
|
||
|
||
break;
|
||
|
||
case READ_STATE_PALETTE:
|
||
DecodeColormap (context->buff, context);
|
||
break;
|
||
|
||
case READ_STATE_BITMASKS:
|
||
decode_bitmasks (context, context->buff);
|
||
break;
|
||
|
||
case READ_STATE_DATA:
|
||
if (context->Compressed == BI_RGB || context->Compressed == BI_BITFIELDS)
|
||
OneLine (context);
|
||
else
|
||
DoCompressed (context);
|
||
|
||
break;
|
||
|
||
default:
|
||
g_assert_not_reached ();
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
void
|
||
gdk_pixbuf__bmp_fill_vtable (GdkPixbufModule *module)
|
||
{
|
||
module->load = gdk_pixbuf__bmp_image_load;
|
||
module->begin_load = gdk_pixbuf__bmp_image_begin_load;
|
||
module->stop_load = gdk_pixbuf__bmp_image_stop_load;
|
||
module->load_increment = gdk_pixbuf__bmp_image_load_increment;
|
||
}
|