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Diffstat (limited to 'Build/source/texk/dvipng/dvipng-1.13/set.c')
-rw-r--r--Build/source/texk/dvipng/dvipng-1.13/set.c289
1 files changed, 289 insertions, 0 deletions
diff --git a/Build/source/texk/dvipng/dvipng-1.13/set.c b/Build/source/texk/dvipng/dvipng-1.13/set.c
new file mode 100644
index 00000000000..af4e4ebdfaa
--- /dev/null
+++ b/Build/source/texk/dvipng/dvipng-1.13/set.c
@@ -0,0 +1,289 @@
+/* set.c */
+
+/************************************************************************
+
+ Part of the dvipng distribution
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation, either version 3 of the
+ License, or (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this program. If not, see
+ <http://www.gnu.org/licenses/>.
+
+ Copyright (C) 2002-2010 Jan-Åke Larsson
+
+************************************************************************/
+
+#include "dvipng.h"
+#include <math.h>
+
+#ifndef HAVE_GDIMAGECREATETRUECOLOR
+#define gdImageColorAllocateAlpha(i,r,g,b,a) gdImageColorAllocate(i,r,g,b)
+#define gdImageColorResolveAlpha(i,r,g,b,a) gdImageColorResolve(i,r,g,b)
+#define gdImageAlpha(i,c) 0
+#define gdAlphaMax 127
+#endif
+#ifndef HAVE_GDIMAGEPNGEX
+#define gdImagePngEx(i,f,z) gdImagePng(i,f)
+#endif
+
+/* Persistent color cache. Index is ink thickness,
+ 0=no ink, 127=total coverage */
+static int ColorCache[gdAlphaMax+1];
+
+void CreateImage(pixels x_width,pixels y_width)
+{
+ if (page_imagep)
+ gdImageDestroy(page_imagep);
+ if (x_width <= 0) x_width=1;
+ if (y_width <= 0) y_width=1;
+#ifdef HAVE_GDIMAGECREATETRUECOLOR
+ /* GIFs are 256-color */
+ if ((option_flags & FORCE_TRUECOLOR
+ || page_flags & PAGE_TRUECOLOR)
+ && ~option_flags & GIF_OUTPUT
+ && ~option_flags & FORCE_PALETTE)
+ page_imagep=gdImageCreateTrueColor(x_width,y_width);
+ else
+#endif
+ page_imagep=gdImageCreate(x_width,y_width);
+ /* Set bg color. GIFs cannot handle an alpha channel, resort to
+ transparent color index, set in WriteImage */
+ ColorCache[0]
+ = gdImageColorAllocateAlpha(page_imagep,
+ cstack[0].red,
+ cstack[0].green,
+ cstack[0].blue,
+ (option_flags & BG_TRANSPARENT_ALPHA
+ && ~option_flags & GIF_OUTPUT) ? 127 : 0);
+ ColorCache[gdAlphaMax]=-1;
+#ifdef HAVE_GDIMAGECREATETRUECOLOR
+ /* Alpha blending in libgd is only performed for truecolor images.
+ We need it for palette images also. Turn libgd alpha blending off
+ and calculate color blending where needed. We turn it back on
+ briefly for image inclusion. */
+ gdImageAlphaBlending(page_imagep, 0);
+ if (option_flags & BG_TRANSPARENT_ALPHA)
+ gdImageSaveAlpha(page_imagep, 1);
+ if (page_imagep->trueColor)
+ /* Truecolor: there is no background color index, fill image instead. */
+ gdImageFilledRectangle(page_imagep, 0, 0,
+ x_width-1, y_width-1, ColorCache[0]);
+#endif
+}
+
+
+static void ChangeColor(gdImagePtr imagep,int x1,int y1,
+ int x2,int y2,int color1,int color2)
+/* In the given rectangle, change color1 to color2 */
+{
+ int x,y;
+ for( y=y1; y<=y2; y++) {
+ for( x=x1; x<=x2; x++) {
+ if (gdImageGetPixel(imagep, x, y)==color1)
+ gdImageSetPixel(imagep, x, y, color2);
+ }
+ }
+}
+
+void WriteImage(char *pngname, int pagenum)
+{
+ char* pos, *freeme=NULL;
+ FILE* outfp=NULL;
+
+ /* Set transparent background. Maybe alpha is not available or
+ perhaps we are producing GIFs, so test for BG_TRANSPARENT_ALPHA
+ too */
+ if (option_flags & (BG_TRANSPARENT|BG_TRANSPARENT_ALPHA))
+ gdImageColorTransparent(page_imagep,ColorCache[0]);
+ /* Transparent border */
+ if (borderwidth>0) {
+ int Transparent;
+ pixels x_width,y_width;
+
+ x_width=gdImageSX(page_imagep);
+ y_width=gdImageSY(page_imagep);
+
+ /* Set ANOTHER bg color, transparent this time */
+ /* No semi-transparency here, given the motivation for this code
+ * (box cursor visibility in Emacs) */
+ if (userbordercolor)
+ Transparent = gdImageColorAllocate(page_imagep,
+ bordercolor.red,
+ bordercolor.green,
+ bordercolor.blue);
+ else
+ Transparent = gdImageColorAllocate(page_imagep,
+ gdImageRed(page_imagep,ColorCache[0]),
+ gdImageGreen(page_imagep,ColorCache[0]),
+ gdImageBlue(page_imagep,ColorCache[0]));
+ gdImageColorTransparent(page_imagep,Transparent);
+ ChangeColor(page_imagep,0,0,x_width-1,borderwidth-1,
+ ColorCache[0],Transparent);
+ ChangeColor(page_imagep,0,0,borderwidth-1,y_width-1,
+ ColorCache[0],Transparent);
+ ChangeColor(page_imagep,x_width-borderwidth,0,x_width-1,y_width-1,
+ ColorCache[0],Transparent);
+ ChangeColor(page_imagep,0,y_width-borderwidth,x_width-1,y_width-1,
+ ColorCache[0],Transparent);
+ }
+
+ if ((pos=strchr(pngname,'%')) != NULL) {
+ if (strchr(++pos,'%'))
+ Fatal("too many %%s in output file name");
+ if (*pos == 'd'
+ || (*pos=='0' && pos[1]>='1' && pos[1]<='9' && pos[2]=='d')) {
+ /* %d -> pagenumber, so add 9 string positions
+ since pagenumber max +-2^31 or +-2*10^9 */
+ freeme = malloc(strlen(pngname)+9);
+ sprintf(freeme,pngname,pagenum);
+ pngname = freeme;
+ } else {
+ Fatal("unacceptible format spec in output file name");
+ }
+ }
+#ifdef HAVE_GDIMAGEGIF
+ if (option_flags & GIF_OUTPUT && (pos=strrchr(pngname,'.')) != NULL
+ && strcmp(pos,".png")==0) {
+ *(pos+1)='g';
+ *(pos+2)='i';
+ *(pos+3)='f';
+ }
+#endif
+ if ((outfp = fopen(pngname,"wb")) == NULL)
+ Fatal("cannot open output file %s",pngname);
+#ifdef HAVE_GDIMAGEGIF
+ if (option_flags & GIF_OUTPUT)
+ gdImageGif(page_imagep,outfp);
+ else
+#endif
+ gdImagePngEx(page_imagep,outfp,compression);
+ fclose(outfp);
+ DEBUG_PRINT(DEBUG_DVI,("\n WROTE: \t%s\n",pngname));
+ if (freeme)
+ free(freeme);
+ DestroyImage();
+}
+
+void DestroyImage(void)
+{
+ gdImageDestroy(page_imagep);
+ page_imagep=NULL;
+}
+
+static int gammatable[]=
+ {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,
+ 20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,
+ 40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,
+ 60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,
+ 80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,
+ 100,101,102,103,104,105,106,107,108,109,
+ 110,111,112,113,114,115,116,117,118,119,
+ 120,121,122,123,124,125,126,127};
+
+void Gamma(double gamma)
+{
+ int i=0;
+
+ while (i<=gdAlphaMax) {
+ gammatable[i]=gdAlphaMax-
+ (int)(pow((gdAlphaMax-i)/((double)gdAlphaMax),gamma)*gdAlphaMax);
+ DEBUG_PRINT(DEBUG_GLYPH,
+ ("\n GAMMA GREYSCALE: %d -> %d ",i,gammatable[i]));
+ i++;
+ }
+}
+
+dviunits SetGlyph(struct char_entry *ptr, int32_t hh,int32_t vv)
+/* gdImageChar can only do monochrome glyphs */
+{
+ int dst_alpha,dst_weight,tot_weight,alpha;
+ int x,y,pos=0;
+ int bgColor,pixelgrey,pixelcolor;
+
+ hh -= ptr->xOffset/shrinkfactor;
+ vv -= ptr->yOffset/shrinkfactor;
+ /* Initialize persistent color cache. Perhaps this should be in
+ color.c? */
+ pixelcolor=gdImageColorResolve(page_imagep,
+ cstack[csp].red,
+ cstack[csp].green,
+ cstack[csp].blue);
+ if (ColorCache[gdAlphaMax]!=pixelcolor) {
+ for( x=1; x<gdAlphaMax; x++ )
+ ColorCache[x]=-1;
+ ColorCache[gdAlphaMax]=pixelcolor;
+ }
+ for( y=0; y<ptr->h; y++) {
+ for( x=0; x<ptr->w; x++) {
+ if (ptr->data[pos]>0) {
+ pixelgrey=gammatable[(int)ptr->data[pos]/2];
+ bgColor = gdImageGetPixel(page_imagep, hh + x, vv + y);
+ if (ColorCache[0]!=bgColor || ColorCache[pixelgrey]==-1) {
+ DEBUG_PRINT(DEBUG_GLYPH,("\n GAMMA GREYSCALE: %d -> %d ",
+ ptr->data[pos]/2,pixelgrey));
+ alpha = gdAlphaMax-pixelgrey;
+ dst_alpha = gdImageAlpha(page_imagep,bgColor);
+ dst_weight = (gdAlphaMax - dst_alpha) * alpha / gdAlphaMax;
+ tot_weight = pixelgrey + dst_weight;
+ pixelcolor = gdImageColorResolveAlpha(page_imagep,
+ (cstack[csp].red*pixelgrey
+ + gdImageRed(page_imagep,bgColor)*dst_weight)/tot_weight,
+ (cstack[csp].green*pixelgrey
+ + gdImageGreen(page_imagep,bgColor)*dst_weight)/tot_weight,
+ (cstack[csp].blue*pixelgrey
+ + gdImageBlue(page_imagep,bgColor)*dst_weight)/tot_weight,
+ alpha*dst_alpha/gdAlphaMax);
+ if (ColorCache[0]==bgColor)
+ ColorCache[pixelgrey]=pixelcolor;
+ } else
+ pixelcolor=ColorCache[pixelgrey];
+ gdImageSetPixel(page_imagep, hh + x, vv + y, pixelcolor);
+ }
+ pos++;
+ }
+ }
+ return(ptr->tfmw);
+}
+
+dviunits SetRule(dviunits a, dviunits b, subpixels hh,subpixels vv)
+{
+ /* This routine will draw a \rule */
+ int Color;
+ pixels width=0, height=0;
+
+ if ( a > 0 && b > 0 ) {
+ /* Calculate width and height, round up */
+ width = (b+dvi->conv*shrinkfactor-1)/dvi->conv/shrinkfactor;
+ height = (a+dvi->conv*shrinkfactor-1)/dvi->conv/shrinkfactor;
+ }
+ if (page_imagep != NULL) {
+ if ((height>0) && (width>0)) {
+ /* This code produces too dark rules. But what the hell. Grey
+ * rules look fuzzy. */
+ Color = gdImageColorResolve(page_imagep,
+ cstack[csp].red,
+ cstack[csp].green,
+ cstack[csp].blue);
+ /* +1 and -1 are because the Rectangle coords include last pixels */
+ gdImageFilledRectangle(page_imagep,hh,vv-height+1,hh+width-1,vv,Color);
+ DEBUG_PRINT(DEBUG_DVI,("\n RULE \t%dx%d at (%d,%d)",
+ width, height, hh, vv));
+ }
+ } else {
+ /* The +1's are because things are cut _at_that_coordinate_. */
+ min(x_min,hh);
+ min(y_min,vv-height+1);
+ max(x_max,hh+width);
+ max(y_max,vv+1);
+ }
+ return(b);
+}
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