32d4bc4099
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@9293 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
474 lines
14 KiB
C++
474 lines
14 KiB
C++
//
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// "$Id$"
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//
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// Bitmap drawing routines for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2010 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// http://www.fltk.org/COPYING.php
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//
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// Please report all bugs and problems on the following page:
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//
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// http://www.fltk.org/str.php
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//
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/** \fn Fl_Bitmap::Fl_Bitmap(const char *array, int W, int H)
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The constructors create a new bitmap from the specified bitmap data.*/
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/** \fn Fl_Bitmap::Fl_Bitmap(const unsigned char *array, int W, int H)
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The constructors create a new bitmap from the specified bitmap data.*/
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#include <FL/Fl.H>
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#include <FL/x.H>
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#include <FL/fl_draw.H>
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#include <FL/Fl_Widget.H>
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#include <FL/Fl_Menu_Item.H>
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#include <FL/Fl_Bitmap.H>
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#include <FL/Fl_Printer.H>
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#include "flstring.h"
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#if defined(__APPLE_QUARTZ__)
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Fl_Bitmask fl_create_bitmask(int w, int h, const uchar *array) {
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static uchar reverse[16] = /* Bit reversal lookup table */
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{ 0x00, 0x88, 0x44, 0xcc, 0x22, 0xaa, 0x66, 0xee,
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0x11, 0x99, 0x55, 0xdd, 0x33, 0xbb, 0x77, 0xff };
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int rowBytes = (w+7)>>3 ;
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uchar *bmask = (uchar*)malloc(rowBytes*h), *dst = bmask;
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const uchar *src = array;
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for ( int i=rowBytes*h; i>0; i--,src++ ) {
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*dst++ = ((reverse[*src & 0x0f] & 0xf0) | (reverse[(*src >> 4) & 0x0f] & 0x0f))^0xff;
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}
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CGDataProviderRef srcp = CGDataProviderCreateWithData( 0L, bmask, rowBytes*h, 0L);
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CGImageRef id_ = CGImageMaskCreate( w, h, 1, 1, rowBytes, srcp, 0L, false);
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CGDataProviderRelease(srcp);
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return (Fl_Bitmask)id_;
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}
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void fl_delete_bitmask(Fl_Bitmask bm) {
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if (bm) CGImageRelease((CGImageRef)bm);
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}
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#elif defined(WIN32) // Windows bitmask functions...
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// 'fl_create_bitmap()' - Create a 1-bit bitmap for drawing...
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static Fl_Bitmask fl_create_bitmap(int w, int h, const uchar *data) {
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// we need to pad the lines out to words & swap the bits
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// in each byte.
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int w1 = (w+7)/8;
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int w2 = ((w+15)/16)*2;
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uchar* newarray = new uchar[w2*h];
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const uchar* src = data;
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uchar* dest = newarray;
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Fl_Bitmask bm;
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static uchar reverse[16] = /* Bit reversal lookup table */
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{ 0x00, 0x88, 0x44, 0xcc, 0x22, 0xaa, 0x66, 0xee,
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0x11, 0x99, 0x55, 0xdd, 0x33, 0xbb, 0x77, 0xff };
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for (int y=0; y < h; y++) {
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for (int n = 0; n < w1; n++, src++)
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*dest++ = (uchar)((reverse[*src & 0x0f] & 0xf0) |
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(reverse[(*src >> 4) & 0x0f] & 0x0f));
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dest += w2-w1;
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}
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bm = CreateBitmap(w, h, 1, 1, newarray);
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delete[] newarray;
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return bm;
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}
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// 'fl_create_bitmask()' - Create an N-bit bitmap for masking...
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Fl_Bitmask fl_create_bitmask(int w, int h, const uchar *data) {
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// this won't work when the user changes display mode during run or
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// has two screens with differnet depths
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Fl_Bitmask bm;
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static uchar hiNibble[16] =
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{ 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
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0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0 };
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static uchar loNibble[16] =
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{ 0x00, 0x08, 0x04, 0x0c, 0x02, 0x0a, 0x06, 0x0e,
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0x01, 0x09, 0x05, 0x0d, 0x03, 0x0b, 0x07, 0x0f };
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int np = GetDeviceCaps(fl_gc, PLANES); //: was always one on sample machines
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int bpp = GetDeviceCaps(fl_gc, BITSPIXEL);//: 1,4,8,16,24,32 and more odd stuff?
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int Bpr = (bpp*w+7)/8; //: bytes per row
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int pad = Bpr&1, w1 = (w+7)/8, shr = ((w-1)&7)+1;
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if (bpp==4) shr = (shr+1)/2;
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uchar *newarray = new uchar[(Bpr+pad)*h];
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uchar *dst = newarray;
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const uchar *src = data;
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for (int i=0; i<h; i++) {
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// This is slooow, but we do it only once per pixmap
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for (int j=w1; j>0; j--) {
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uchar b = *src++;
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if (bpp==1) {
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*dst++ = (uchar)( hiNibble[b&15] ) | ( loNibble[(b>>4)&15] );
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} else if (bpp==4) {
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for (int k=(j==1)?shr:4; k>0; k--) {
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*dst++ = (uchar)("\377\360\017\000"[b&3]);
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b = b >> 2;
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}
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} else {
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for (int k=(j==1)?shr:8; k>0; k--) {
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if (b&1) {
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*dst++=0;
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if (bpp>8) *dst++=0;
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if (bpp>16) *dst++=0;
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if (bpp>24) *dst++=0;
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} else {
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*dst++=0xff;
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if (bpp>8) *dst++=0xff;
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if (bpp>16) *dst++=0xff;
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if (bpp>24) *dst++=0xff;
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}
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b = b >> 1;
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}
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}
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}
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dst += pad;
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}
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bm = CreateBitmap(w, h, np, bpp, newarray);
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delete[] newarray;
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return bm;
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}
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void fl_delete_bitmask(Fl_Bitmask bm) {
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DeleteObject((HGDIOBJ)bm);
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}
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#else // X11 bitmask functions
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Fl_Bitmask fl_create_bitmask(int w, int h, const uchar *data) {
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return XCreateBitmapFromData(fl_display, fl_window, (const char *)data,
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(w+7)&-8, h);
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}
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void fl_delete_bitmask(Fl_Bitmask bm) {
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fl_delete_offscreen((Fl_Offscreen)bm);
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}
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#endif // __APPLE__
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// Create a 1-bit mask used for alpha blending
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Fl_Bitmask fl_create_alphamask(int w, int h, int d, int ld, const uchar *array) {
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Fl_Bitmask bm;
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int bmw = (w + 7) / 8;
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uchar *bitmap = new uchar[bmw * h];
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uchar *bitptr, bit;
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const uchar *dataptr;
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int x, y;
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static uchar dither[16][16] = { // Simple 16x16 Floyd dither
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{ 0, 128, 32, 160, 8, 136, 40, 168,
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2, 130, 34, 162, 10, 138, 42, 170 },
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{ 192, 64, 224, 96, 200, 72, 232, 104,
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194, 66, 226, 98, 202, 74, 234, 106 },
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{ 48, 176, 16, 144, 56, 184, 24, 152,
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50, 178, 18, 146, 58, 186, 26, 154 },
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{ 240, 112, 208, 80, 248, 120, 216, 88,
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242, 114, 210, 82, 250, 122, 218, 90 },
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{ 12, 140, 44, 172, 4, 132, 36, 164,
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14, 142, 46, 174, 6, 134, 38, 166 },
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{ 204, 76, 236, 108, 196, 68, 228, 100,
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206, 78, 238, 110, 198, 70, 230, 102 },
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{ 60, 188, 28, 156, 52, 180, 20, 148,
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62, 190, 30, 158, 54, 182, 22, 150 },
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{ 252, 124, 220, 92, 244, 116, 212, 84,
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254, 126, 222, 94, 246, 118, 214, 86 },
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{ 3, 131, 35, 163, 11, 139, 43, 171,
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1, 129, 33, 161, 9, 137, 41, 169 },
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{ 195, 67, 227, 99, 203, 75, 235, 107,
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193, 65, 225, 97, 201, 73, 233, 105 },
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{ 51, 179, 19, 147, 59, 187, 27, 155,
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49, 177, 17, 145, 57, 185, 25, 153 },
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{ 243, 115, 211, 83, 251, 123, 219, 91,
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241, 113, 209, 81, 249, 121, 217, 89 },
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{ 15, 143, 47, 175, 7, 135, 39, 167,
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13, 141, 45, 173, 5, 133, 37, 165 },
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{ 207, 79, 239, 111, 199, 71, 231, 103,
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205, 77, 237, 109, 197, 69, 229, 101 },
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{ 63, 191, 31, 159, 55, 183, 23, 151,
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61, 189, 29, 157, 53, 181, 21, 149 },
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{ 254, 127, 223, 95, 247, 119, 215, 87,
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253, 125, 221, 93, 245, 117, 213, 85 }
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};
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// Generate a 1-bit "screen door" alpha mask; not always pretty, but
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// definitely fast... In the future we may be able to support things
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// like the RENDER extension in XFree86, when available, to provide
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// true RGBA-blended rendering. See:
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//
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// http://www.xfree86.org/~keithp/render/protocol.html
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//
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// for more info on XRender...
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//
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// MacOS already provides alpha blending support and has its own
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// fl_create_alphamask() function...
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memset(bitmap, 0, bmw * h);
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for (dataptr = array + d - 1, y = 0; y < h; y ++, dataptr += ld)
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for (bitptr = bitmap + y * bmw, bit = 1, x = 0; x < w; x ++, dataptr += d) {
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if (*dataptr > dither[x & 15][y & 15])
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*bitptr |= bit;
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if (bit < 128) bit <<= 1;
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else {
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bit = 1;
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bitptr ++;
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}
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}
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bm = fl_create_bitmask(w, h, bitmap);
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delete[] bitmap;
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return (bm);
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}
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void Fl_Bitmap::draw(int XP, int YP, int WP, int HP, int cx, int cy) {
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fl_graphics_driver->draw(this, XP, YP, WP, HP, cx, cy);
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}
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static int start(Fl_Bitmap *bm, int XP, int YP, int WP, int HP, int w, int h, int &cx, int &cy,
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int &X, int &Y, int &W, int &H)
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{
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// account for current clip region (faster on Irix):
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fl_clip_box(XP,YP,WP,HP,X,Y,W,H);
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cx += X-XP; cy += Y-YP;
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// clip the box down to the size of image, quit if empty:
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if (cx < 0) {W += cx; X -= cx; cx = 0;}
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if (cx+W > w) W = w-cx;
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if (W <= 0) return 1;
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if (cy < 0) {H += cy; Y -= cy; cy = 0;}
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if (cy+H > h) H = h-cy;
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if (H <= 0) return 1;
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return 0;
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}
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#ifdef __APPLE__
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void Fl_Quartz_Graphics_Driver::draw(Fl_Bitmap *bm, int XP, int YP, int WP, int HP, int cx, int cy) {
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int X, Y, W, H;
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if (!bm->array) {
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bm->draw_empty(XP, YP);
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return;
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}
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if (start(bm, XP, YP, WP, HP, bm->w(), bm->h(), cx, cy, X, Y, W, H)) {
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return;
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}
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if (!bm->id_) bm->id_ = fl_create_bitmask(bm->w(), bm->h(), bm->array);
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if (bm->id_ && fl_gc) {
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CGRect rect = { { X, Y }, { W, H } };
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Fl_X::q_begin_image(rect, cx, cy, bm->w(), bm->h());
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CGContextDrawImage(fl_gc, rect, (CGImageRef)bm->id_);
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Fl_X::q_end_image();
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}
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}
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#elif defined(WIN32)
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void Fl_GDI_Graphics_Driver::draw(Fl_Bitmap *bm, int XP, int YP, int WP, int HP, int cx, int cy) {
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int X, Y, W, H;
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if (!bm->array) {
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bm->draw_empty(XP, YP);
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return;
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}
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if (start(bm, XP, YP, WP, HP, bm->w(), bm->h(), cx, cy, X, Y, W, H)) {
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return;
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}
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if (!bm->id_) bm->id_ = fl_create_bitmap(bm->w(), bm->h(), bm->array);
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typedef BOOL (WINAPI* fl_transp_func) (HDC,int,int,int,int,HDC,int,int,int,int,UINT);
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static fl_transp_func fl_TransparentBlt;
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HDC tempdc;
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int save;
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BOOL use_print_algo = false;
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if (Fl_Surface_Device::surface() != Fl_Display_Device::display_device()) {
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static HMODULE hMod = NULL;
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if (!hMod) {
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hMod = LoadLibrary("MSIMG32.DLL");
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if (hMod) fl_TransparentBlt = (fl_transp_func)GetProcAddress(hMod, "TransparentBlt");
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}
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if (fl_TransparentBlt) use_print_algo = true;
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}
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if (use_print_algo) { // algorithm for bitmap output to Fl_GDI_Printer
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Fl_Color save_c = fl_color(); // save bitmap's desired color
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uchar r, g, b;
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Fl::get_color(save_c, r, g, b);
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r = 255-r;
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g = 255-g;
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b = 255-b;
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Fl_Color background = fl_rgb_color(r, g, b); // a color very different from the bitmap's
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Fl_Offscreen tmp_id = fl_create_offscreen(W, H);
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fl_begin_offscreen(tmp_id);
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fl_color(background);
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fl_rectf(0,0,W,H); // use this color as offscreen background
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fl_color(save_c); // back to bitmap's color
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tempdc = CreateCompatibleDC(fl_gc);
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save = SaveDC(tempdc);
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SelectObject(tempdc, (HGDIOBJ)bm->id_);
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SelectObject(fl_gc, fl_brush()); // use bitmap's desired color
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BitBlt(fl_gc, 0, 0, W, H, tempdc, 0, 0, 0xE20746L); // draw bitmap to offscreen
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fl_end_offscreen(); // offscreen data is in tmp_id
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SelectObject(tempdc, (HGDIOBJ)tmp_id); // use offscreen data
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// draw it to printer context with background color as transparent
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fl_TransparentBlt(fl_gc, X,Y,W,H, tempdc, cx, cy, bm->w(), bm->h(), RGB(r, g, b) );
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fl_delete_offscreen(tmp_id);
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}
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else { // algorithm for bitmap output to display
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tempdc = CreateCompatibleDC(fl_gc);
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save = SaveDC(tempdc);
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SelectObject(tempdc, (HGDIOBJ)bm->id_);
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SelectObject(fl_gc, fl_brush());
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// secret bitblt code found in old MSWindows reference manual:
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BitBlt(fl_gc, X, Y, W, H, tempdc, cx, cy, 0xE20746L);
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}
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RestoreDC(tempdc, save);
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DeleteDC(tempdc);
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}
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#else // Xlib
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void Fl_Xlib_Graphics_Driver::draw(Fl_Bitmap *bm, int XP, int YP, int WP, int HP, int cx, int cy) {
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int X, Y, W, H;
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if (!bm->array) {
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bm->draw_empty(XP, YP);
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return;
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}
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if (start(bm, XP, YP, WP, HP, bm->w(), bm->h(), cx, cy, X, Y, W, H)) {
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return;
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}
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if (!bm->id_) bm->id_ = fl_create_bitmask(bm->w(), bm->h(), bm->array);
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XSetStipple(fl_display, fl_gc, bm->id_);
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int ox = X-cx; if (ox < 0) ox += bm->w();
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int oy = Y-cy; if (oy < 0) oy += bm->h();
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XSetTSOrigin(fl_display, fl_gc, ox, oy);
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XSetFillStyle(fl_display, fl_gc, FillStippled);
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XFillRectangle(fl_display, fl_window, fl_gc, X, Y, W, H);
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XSetFillStyle(fl_display, fl_gc, FillSolid);
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}
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#endif
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/**
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The destructor free all memory and server resources that are used by
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the bitmap.
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*/
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Fl_Bitmap::~Fl_Bitmap() {
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uncache();
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if (alloc_array) delete[] (uchar *)array;
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}
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void Fl_Bitmap::uncache() {
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if (id_) {
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#ifdef __APPLE_QUARTZ__
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fl_delete_bitmask((Fl_Bitmask)id_);
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#else
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fl_delete_bitmask((Fl_Offscreen)id_);
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#endif
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id_ = 0;
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}
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}
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void Fl_Bitmap::label(Fl_Widget* widget) {
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widget->image(this);
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}
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void Fl_Bitmap::label(Fl_Menu_Item* m) {
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Fl::set_labeltype(_FL_IMAGE_LABEL, labeltype, measure);
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m->label(_FL_IMAGE_LABEL, (const char*)this);
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}
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Fl_Image *Fl_Bitmap::copy(int W, int H) {
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Fl_Bitmap *new_image; // New RGB image
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uchar *new_array; // New array for image data
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// Optimize the simple copy where the width and height are the same...
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if (W == w() && H == h()) {
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new_array = new uchar [H * ((W + 7) / 8)];
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memcpy(new_array, array, H * ((W + 7) / 8));
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new_image = new Fl_Bitmap(new_array, W, H);
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new_image->alloc_array = 1;
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return new_image;
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}
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if (W <= 0 || H <= 0) return 0;
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// OK, need to resize the image data; allocate memory and
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uchar *new_ptr, // Pointer into new array
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new_bit, // Bit for new array
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old_bit; // Bit for old array
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const uchar *old_ptr; // Pointer into old array
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int sx, sy, // Source coordinates
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dx, dy, // Destination coordinates
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xerr, yerr, // X & Y errors
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xmod, ymod, // X & Y moduli
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xstep, ystep; // X & Y step increments
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// Figure out Bresenheim step/modulus values...
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xmod = w() % W;
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xstep = w() / W;
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ymod = h() % H;
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ystep = h() / H;
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// Allocate memory for the new image...
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new_array = new uchar [H * ((W + 7) / 8)];
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new_image = new Fl_Bitmap(new_array, W, H);
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|
new_image->alloc_array = 1;
|
|
|
|
memset(new_array, 0, H * ((W + 7) / 8));
|
|
|
|
// Scale the image using a nearest-neighbor algorithm...
|
|
for (dy = H, sy = 0, yerr = H, new_ptr = new_array; dy > 0; dy --) {
|
|
for (dx = W, xerr = W, old_ptr = array + sy * ((w() + 7) / 8), sx = 0, new_bit = 1;
|
|
dx > 0;
|
|
dx --) {
|
|
old_bit = (uchar)(1 << (sx & 7));
|
|
if (old_ptr[sx / 8] & old_bit) *new_ptr |= new_bit;
|
|
|
|
if (new_bit < 128) new_bit <<= 1;
|
|
else {
|
|
new_bit = 1;
|
|
new_ptr ++;
|
|
}
|
|
|
|
sx += xstep;
|
|
xerr -= xmod;
|
|
|
|
if (xerr <= 0) {
|
|
xerr += W;
|
|
sx ++;
|
|
}
|
|
}
|
|
|
|
if (new_bit > 1) new_ptr ++;
|
|
|
|
sy += ystep;
|
|
yerr -= ymod;
|
|
if (yerr <= 0) {
|
|
yerr += H;
|
|
sy ++;
|
|
}
|
|
}
|
|
|
|
return new_image;
|
|
}
|
|
|
|
|
|
//
|
|
// End of "$Id$".
|
|
//
|