mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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afee2c67c5
Wed Jul 26 12:59:31 2000 Tim Janik <timj@gtk.org>
* *.[hc]: applied patch from Andreas Persenius <ndap@swipnet.se> that
updates the license headers to the GNU Lesser General Public License,
as well as updating the copyright year to 2000.
689 lines
17 KiB
C
689 lines
17 KiB
C
/* GdkPixbuf library - Windows Icon/Cursor 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-bmp.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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#undef DUMPBIH
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/*
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Icons are just like BMP's, except for the header.
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Known bugs:
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* bi-tonal files aren't tested
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*/
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#include <config.h>
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#include <stdio.h>
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#include <unistd.h>
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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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/*
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These structures are actually dummies. These are according to
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the "Windows API reference guide volume II" as written by
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Borland International, but GCC fiddles with the alignment of
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the internal members.
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*/
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struct BitmapFileHeader {
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gushort bfType;
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guint bfSize;
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guint reserverd;
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guint bfOffbits;
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};
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struct BitmapInfoHeader {
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guint biSize;
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guint biWidth;
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guint biHeight;
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gushort biPlanes;
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gushort biBitCount;
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guint biCompression;
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guint biSizeImage;
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guint biXPelsPerMeter;
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guint biYPelsPerMeter;
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guint biClrUsed;
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guint biClrImportant;
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};
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#ifdef DUMPBIH
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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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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) + (BIH[0]));
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printf("biWidth = %i \n",
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(int)(BIH[7] << 24) + (BIH[6] << 16) + (BIH[5] << 8) + (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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/* Progressive loading */
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struct headerpair {
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guint width;
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guint 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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struct ico_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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gint HeaderSize; /* The size of the header-part (incl colormap) */
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guchar *HeaderBuf; /* The buffer for the header (incl colormap) */
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gint BytesInHeaderBuf; /* The size of the allocated HeaderBuf */
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gint HeaderDone; /* The nr of bytes actually in HeaderBuf */
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gint LineWidth; /* The width of a line in bytes */
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guchar *LineBuf; /* Buffer for 1 line */
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gint LineDone; /* # of bytes in LineBuf */
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gint Lines; /* # of finished lines */
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gint Type; /*
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24 = RGB
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8 = 8 bit colormapped
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1 = 1 bit bitonal
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*/
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struct headerpair Header; /* Decoded (BE->CPU) header */
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gint DIBoffset;
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gint ImageScore;
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GdkPixbuf *pixbuf; /* Our "target" */
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};
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gpointer
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gdk_pixbuf__ico_image_begin_load(ModulePreparedNotifyFunc prepared_func,
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ModuleUpdatedNotifyFunc updated_func,
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ModuleFrameDoneNotifyFunc frame_done_func,
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ModuleAnimationDoneNotifyFunc anim_done_func,
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gpointer user_data);
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void gdk_pixbuf__ico_image_stop_load(gpointer data);
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gboolean gdk_pixbuf__ico_image_load_increment(gpointer data, guchar * buf, guint size);
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/* Shared library entry point --> Can go when generic_image_load
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enters gdk-pixbuf-io */
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GdkPixbuf *
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gdk_pixbuf__ico_image_load(FILE * f)
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{
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guchar *membuf;
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size_t length;
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struct ico_progressive_state *State;
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GdkPixbuf *pb;
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State = gdk_pixbuf__ico_image_begin_load(NULL, NULL, NULL, NULL, NULL);
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membuf = g_malloc(4096);
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g_assert(membuf != NULL);
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while (feof(f) == 0) {
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length = fread(membuf, 1, 4096, f);
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if (length > 0)
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gdk_pixbuf__ico_image_load_increment(State, membuf, length);
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}
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g_free(membuf);
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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__ico_image_stop_load(State);
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return pb;
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}
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static void DecodeHeader(guchar *Data, gint Bytes,
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struct ico_progressive_state *State)
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{
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/* For ICO's we have to be very clever. There are multiple images possible
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in an .ICO. For now, we select (in order of priority):
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1) The one with the highest number of colors
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2) The largest one
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*/
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gint IconCount = 0; /* The number of icon-versions in the file */
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guchar *BIH; /* The DIB for the used icon */
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guchar *Ptr;
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gint I;
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/* Step 1: The ICO header */
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IconCount = (Data[5] << 8) + (Data[4]);
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State->HeaderSize = 6 + IconCount*16;
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if (State->HeaderSize>State->BytesInHeaderBuf) {
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State->HeaderBuf=g_realloc(State->HeaderBuf,State->HeaderSize);
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State->BytesInHeaderBuf = State->HeaderSize;
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}
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if (Bytes < State->HeaderSize)
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return;
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/* We now have all the "short-specs" of the versions
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So we iterate through them and select the best one */
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State->ImageScore = 0;
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State->DIBoffset = 0;
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Ptr = Data + 6;
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for (I=0;I<IconCount;I++) {
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int ThisWidth, ThisHeight,ThisColors;
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int ThisScore;
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ThisWidth = Ptr[0];
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ThisHeight = Ptr[1];
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ThisColors = (Ptr[2]);
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if (ThisColors==0)
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ThisColors=256; /* Yes, this is in the spec, ugh */
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ThisScore = ThisColors*1024+ThisWidth*ThisHeight;
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if (ThisScore>State->ImageScore) {
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State->ImageScore = ThisScore;
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State->DIBoffset = (Ptr[15]<<24)+(Ptr[14]<<16)+
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(Ptr[13]<<8) + (Ptr[12]);
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}
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Ptr += 16;
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}
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/* We now have a winner, pointed to in State->DIBoffset,
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so we know how many bytes are in the "header" part. */
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State->HeaderSize = State->DIBoffset + 40; /* 40 = sizeof(InfoHeader) */
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if (State->HeaderSize>State->BytesInHeaderBuf) {
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State->HeaderBuf=g_realloc(State->HeaderBuf,State->HeaderSize);
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State->BytesInHeaderBuf = State->HeaderSize;
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}
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if (Bytes<State->HeaderSize)
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return;
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BIH = Data+State->DIBoffset;
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#ifdef DUMPBIH
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DumpBIH(BIH);
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#endif
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/* Add the palette to the headersize */
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State->Header.width =
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(int)(BIH[7] << 24) + (BIH[6] << 16) + (BIH[5] << 8) + (BIH[4]);
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State->Header.height =
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(int)(BIH[11] << 24) + (BIH[10] << 16) + (BIH[9] << 8) + (BIH[8])/2;
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/* /2 because the BIH height includes the transparency mask */
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State->Header.depth = (BIH[15] << 8) + (BIH[14]);;
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State->Type = State->Header.depth;
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if (State->Lines>=State->Header.height)
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State->Type = 1; /* The transparency mask is 1 bpp */
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/* Determine the palette size. If the header indicates 0, it
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is actually the maximum for the bpp. You have to love the
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guys who made the spec. */
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I = (int)(BIH[35] << 24) + (BIH[34] << 16) + (BIH[33] << 8) + (BIH[32]);
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I = I*4;
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if ((I==0)&&(State->Type==1))
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I = 2*4;
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if ((I==0)&&(State->Type==4))
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I = 16*4;
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if ((I==0)&&(State->Type==8))
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I = 256*4;
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State->HeaderSize+=I;
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if (State->HeaderSize>State->BytesInHeaderBuf) {
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State->HeaderBuf=g_realloc(State->HeaderBuf,State->HeaderSize);
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State->BytesInHeaderBuf = State->HeaderSize;
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}
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if (Bytes < State->HeaderSize)
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return;
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if ((BIH[16] != 0) || (BIH[17] != 0) || (BIH[18] != 0)
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|| (BIH[19] != 0)) {
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g_assert(0); /* Compressed icons aren't allowed */
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}
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/* Negative heights mean top-down pixel-order */
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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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}
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if (State->Type == 24)
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State->LineWidth = State->Header.width * 3;
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if (State->Type == 8)
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State->LineWidth = State->Header.width * 1;
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if (State->Type == 4) {
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State->LineWidth = (State->Header.width+1)/2;
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}
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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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}
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/* Pad to a 32 bit boundary */
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if (((State->LineWidth % 4) > 0))
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State->LineWidth = (State->LineWidth / 4) * 4 + 4;
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if (State->LineBuf == NULL)
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State->LineBuf = g_malloc(State->LineWidth);
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g_assert(State->LineBuf != NULL);
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if (State->pixbuf == NULL) {
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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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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,
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State->user_data);
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}
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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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gpointer
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gdk_pixbuf__ico_image_begin_load(ModulePreparedNotifyFunc prepared_func,
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ModuleUpdatedNotifyFunc updated_func,
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ModuleFrameDoneNotifyFunc frame_done_func,
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ModuleAnimationDoneNotifyFunc anim_done_func,
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gpointer user_data)
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{
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struct ico_progressive_state *context;
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context = g_new0(struct ico_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->HeaderSize = 54;
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context->HeaderBuf = g_malloc(14 + 40 + 4*256 + 512);
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/* 4*256 for the colormap */
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context->BytesInHeaderBuf = 14 + 40 + 4*256 + 512 ;
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context->HeaderDone = 0;
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context->LineWidth = 0;
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context->LineBuf = NULL;
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context->LineDone = 0;
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context->Lines = 0;
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context->Type = 0;
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memset(&context->Header, 0, sizeof(struct headerpair));
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context->pixbuf = NULL;
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return (gpointer) context;
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}
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/*
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* context - returned from image_begin_load
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*
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* free context, unref gdk_pixbuf
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*/
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void gdk_pixbuf__ico_image_stop_load(gpointer data)
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{
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struct ico_progressive_state *context =
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(struct ico_progressive_state *) data;
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g_return_if_fail(context != NULL);
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if (context->LineBuf != NULL)
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g_free(context->LineBuf);
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context->LineBuf = NULL;
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if (context->HeaderBuf != NULL)
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g_free(context->HeaderBuf);
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if (context->pixbuf)
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gdk_pixbuf_unref(context->pixbuf);
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g_free(context);
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}
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static void OneLine24(struct ico_progressive_state *context)
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{
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gint X;
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guchar *Pixels;
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X = 0;
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if (context->Header.Negative == 0)
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Pixels = (context->pixbuf->pixels +
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context->pixbuf->rowstride *
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(context->Header.height - context->Lines - 1));
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else
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Pixels = (context->pixbuf->pixels +
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context->pixbuf->rowstride *
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context->Lines);
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while (X < context->Header.width) {
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Pixels[X * 4 + 0] = context->LineBuf[X * 3 + 2];
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Pixels[X * 4 + 1] = context->LineBuf[X * 3 + 1];
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Pixels[X * 4 + 2] = context->LineBuf[X * 3 + 0];
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X++;
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}
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}
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static void OneLine8(struct ico_progressive_state *context)
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{
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gint X;
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guchar *Pixels;
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X = 0;
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if (context->Header.Negative == 0)
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Pixels = (context->pixbuf->pixels +
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context->pixbuf->rowstride *
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(context->Header.height - context->Lines - 1));
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else
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Pixels = (context->pixbuf->pixels +
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context->pixbuf->rowstride *
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context->Lines);
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while (X < context->Header.width) {
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/* The joys of having a BGR byteorder */
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Pixels[X * 4 + 0] =
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context->HeaderBuf[4 * context->LineBuf[X] + 42+context->DIBoffset];
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Pixels[X * 4 + 1] =
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context->HeaderBuf[4 * context->LineBuf[X] + 41+context->DIBoffset];
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Pixels[X * 4 + 2] =
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context->HeaderBuf[4 * context->LineBuf[X] + 40+context->DIBoffset];
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X++;
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}
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}
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static void OneLine4(struct ico_progressive_state *context)
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{
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gint X;
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guchar *Pixels;
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X = 0;
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if (context->Header.Negative == 0)
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Pixels = (context->pixbuf->pixels +
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context->pixbuf->rowstride *
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(context->Header.height - context->Lines - 1));
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else
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Pixels = (context->pixbuf->pixels +
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context->pixbuf->rowstride *
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context->Lines);
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while (X < context->Header.width) {
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guchar Pix;
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Pix = context->LineBuf[X/2];
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Pixels[X * 4 + 0] =
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context->HeaderBuf[4 * (Pix>>4) + 42+context->DIBoffset];
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Pixels[X * 4 + 1] =
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context->HeaderBuf[4 * (Pix>>4) + 41+context->DIBoffset];
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Pixels[X * 4 + 2] =
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context->HeaderBuf[4 * (Pix>>4) + 40+context->DIBoffset];
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X++;
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if (X<context->Header.width) {
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/* Handle the other 4 bit pixel only when there is one */
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Pixels[X * 4 + 0] =
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context->HeaderBuf[4 * (Pix&15) + 42+context->DIBoffset];
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Pixels[X * 4 + 1] =
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context->HeaderBuf[4 * (Pix&15) + 41+context->DIBoffset];
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Pixels[X * 4 + 2] =
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context->HeaderBuf[4 * (Pix&15) + 40+context->DIBoffset];
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X++;
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}
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}
|
||
|
||
}
|
||
|
||
static void OneLine1(struct ico_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) {
|
||
int Bit;
|
||
|
||
Bit = (context->LineBuf[X / 8]) >> (7 - (X & 7));
|
||
Bit = Bit & 1;
|
||
/* The joys of having a BGR byteorder */
|
||
Pixels[X * 4 + 0] = Bit*255;
|
||
Pixels[X * 4 + 1] = Bit*255;
|
||
Pixels[X * 4 + 2] = Bit*255;
|
||
X++;
|
||
}
|
||
}
|
||
|
||
static void OneLineTransp(struct ico_progressive_state *context)
|
||
{
|
||
gint X;
|
||
guchar *Pixels;
|
||
|
||
X = 0;
|
||
if (context->Header.Negative == 0)
|
||
Pixels = (context->pixbuf->pixels +
|
||
context->pixbuf->rowstride *
|
||
(2*context->Header.height - context->Lines - 1));
|
||
else
|
||
Pixels = (context->pixbuf->pixels +
|
||
context->pixbuf->rowstride *
|
||
(context->Lines-context->Header.height));
|
||
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 * 4 + 3] = 255-Bit*255;
|
||
#if 0
|
||
if (Bit){
|
||
Pixels[X*4+0] = 255;
|
||
Pixels[X*4+1] = 255;
|
||
} else {
|
||
Pixels[X*4+0] = 0;
|
||
Pixels[X*4+1] = 0;
|
||
}
|
||
#endif
|
||
X++;
|
||
}
|
||
}
|
||
|
||
|
||
static void OneLine(struct ico_progressive_state *context)
|
||
{
|
||
context->LineDone = 0;
|
||
|
||
if (context->Lines >= context->Header.height*2) {
|
||
return;
|
||
}
|
||
|
||
if (context->Lines <context->Header.height) {
|
||
|
||
if (context->Type == 24)
|
||
OneLine24(context);
|
||
if (context->Type == 8)
|
||
OneLine8(context);
|
||
if (context->Type == 4)
|
||
OneLine4(context);
|
||
if (context->Type == 1)
|
||
OneLine1(context);
|
||
} else
|
||
{
|
||
OneLineTransp(context);
|
||
}
|
||
|
||
context->Lines++;
|
||
if (context->Lines>=context->Header.height) {
|
||
context->Type = 1;
|
||
context->LineWidth = context->Header.width / 8;
|
||
if ((context->Header.width & 7) != 0)
|
||
context->LineWidth++;
|
||
/* Pad to a 32 bit boundary */
|
||
if (((context->LineWidth % 4) > 0))
|
||
context->LineWidth = (context->LineWidth / 4) * 4 + 4;
|
||
|
||
}
|
||
|
||
|
||
if (context->updated_func != NULL) {
|
||
(*context->updated_func) (context->pixbuf,
|
||
0,
|
||
context->Lines,
|
||
context->Header.width,
|
||
context->Header.height,
|
||
context->user_data);
|
||
|
||
}
|
||
}
|
||
|
||
/*
|
||
* 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__ico_image_load_increment(gpointer data, guchar * buf, guint size)
|
||
{
|
||
struct ico_progressive_state *context =
|
||
(struct ico_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
|
||
{
|
||
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 >= 6)
|
||
DecodeHeader(context->HeaderBuf,
|
||
context->HeaderDone, context);
|
||
|
||
|
||
}
|
||
|
||
return TRUE;
|
||
}
|