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/* draw.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) 2002-2015 Jan-Åke Larsson
************************************************************************/
#include "dvipng.h"
#ifdef DEBUG
#include <ctype.h> /* isprint */
#endif
struct stack_entry {
dviunits h, v, w, x, y, z; /* stack entry */
subpixels hh,vv;
} stack[STACK_SIZE+1]; /* stack + space for current pos */
struct stack_entry* dvi_stack=stack;
#define MAXDRIFT 1
#define CHECK_MAXDRIFT(x,xx) \
if ( xx-PIXROUND(x,dvi->conv*shrinkfactor) < -MAXDRIFT ) { \
DEBUG_PRINT(DEBUG_DVI,(" add 1 to")); \
xx += 1; \
} \
if ( xx-PIXROUND(x,dvi->conv*shrinkfactor) > MAXDRIFT ) { \
DEBUG_PRINT(DEBUG_DVI,(" sub 1 to")); \
xx -= 1; \
} \
if (PIXROUND(dvi_stack->h,dvi->conv*shrinkfactor) != dvi_stack->hh \
|| PIXROUND(dvi_stack->v,dvi->conv*shrinkfactor) != dvi_stack->vv)\
DEBUG_PRINT(DEBUG_DVI, \
(" drift (%d,%d)", \
dvi_stack->hh-PIXROUND(dvi_stack->h,dvi->conv*shrinkfactor), \
dvi_stack->vv-PIXROUND(dvi_stack->v,dvi->conv*shrinkfactor)));
#define MoveRight(x) \
temp=x; dvi_stack->h += temp; \
if ( currentfont==NULL \
|| temp > currentfont->s/6 || temp < -currentfont->s/6*4 ) \
dvi_stack->hh = PIXROUND(dvi_stack->h,dvi->conv*shrinkfactor); \
else \
dvi_stack->hh += PIXROUND( temp,dvi->conv*shrinkfactor ); \
CHECK_MAXDRIFT(dvi_stack->h,dvi_stack->hh)
#define MoveDown(x) \
temp=x; dvi_stack->v += temp; \
if ( currentfont==NULL \
|| temp > currentfont->s/6*5 || temp < currentfont->s/6*(-5) ) \
dvi_stack->vv = PIXROUND(dvi_stack->v,dvi->conv*shrinkfactor); \
else \
dvi_stack->vv += PIXROUND( temp,dvi->conv*shrinkfactor ); \
CHECK_MAXDRIFT(dvi_stack->v,dvi_stack->vv)
#define DO_VFCONV(a) ((((struct font_entry*) parent)->type==DVI_TYPE)?a:\
(dviunits)((int64_t) a * ((struct font_entry*) parent)->s / (1 << 20)))
dviunits SetChar(int32_t c)
{
struct char_entry* ptr=NULL;
if (currentfont==NULL)
Fatal("faulty DVI, trying to set character from null font");
if (c<0 || c>LASTFNTCHAR) {
Warning("glyph index out of range (%d), skipping",c);
return(0);
}
ptr=currentfont->chr[c];
if (ptr==NULL) {
Warning("unable to draw glyph %d, skipping",c);
return(0);
}
#ifdef DEBUG
switch (currentfont->type) {
case FONT_TYPE_VF: DEBUG_PRINT(DEBUG_DVI,("\n VF CHAR:\t")); break;
case FONT_TYPE_PK: DEBUG_PRINT(DEBUG_DVI,("\n PK CHAR:\t")); break;
case FONT_TYPE_FT: DEBUG_PRINT(DEBUG_DVI,("\n FT CHAR:\t")); break;
default: DEBUG_PRINT(DEBUG_DVI,("\n NO CHAR:\t"))
}
if (debug & DEBUG_DVI && c>=0 && c<=UCHAR_MAX && isprint(c))
DEBUG_PRINT(DEBUG_DVI,("'%c' ",c));
DEBUG_PRINT(DEBUG_DVI,("%d at (%d,%d) tfmw %d", c,
dvi_stack->hh,dvi_stack->vv,ptr?ptr->tfmw:0));
#endif
if (currentfont->type==FONT_TYPE_VF) {
return(SetVF(ptr));
} else {
if (ptr->data == NULL)
switch(currentfont->type) {
case FONT_TYPE_PK: LoadPK(c, ptr); break;
#ifdef HAVE_FT2
case FONT_TYPE_FT: LoadFT(c, ptr); break;
#endif
default:
Fatal("undefined fonttype %d",currentfont->type);
}
if (page_imagep != NULL)
return(SetGlyph(ptr, dvi_stack->hh, dvi_stack->vv));
else {
/* Expand bounding box if necessary */
min(x_min,dvi_stack->hh - ptr->xOffset/shrinkfactor);
min(y_min,dvi_stack->vv - ptr->yOffset/shrinkfactor);
max(x_max,dvi_stack->hh - ptr->xOffset/shrinkfactor + ptr->w);
max(y_max,dvi_stack->vv - ptr->yOffset/shrinkfactor + ptr->h);
return(ptr->tfmw);
}
}
return(0);
}
void DrawCommand(unsigned char* command, void* parent /* dvi/vf */)
/* To be used both in plain DVI drawing and VF drawing */
{
dviunits temp;
if (/*command >= SETC_000 &&*/ *command <= SETC_127) {
temp = SetChar((int32_t)*command);
dvi_stack->h += temp;
dvi_stack->hh += PIXROUND(temp,dvi->conv*shrinkfactor);
CHECK_MAXDRIFT(dvi_stack->h,dvi_stack->hh);
} else if (*command >= FONT_00 && *command <= FONT_63) {
SetFntNum((int32_t)*command - FONT_00,parent);
} else switch (*command) {
case PUT1: case PUT2: case PUT3: case PUT4:
DEBUG_PRINT(DEBUG_DVI,(" %d",
UNumRead(command+1, dvi_commandlength[*command]-1)));
(void) SetChar(UNumRead(command+1, dvi_commandlength[*command]-1));
break;
case SET1: case SET2: case SET3: case SET4:
DEBUG_PRINT(DEBUG_DVI,(" %d",
UNumRead(command+1, dvi_commandlength[*command]-1)));
{
temp = SetChar(UNumRead(command+1, dvi_commandlength[*command]-1));
dvi_stack->h += temp;
dvi_stack->hh += PIXROUND(temp,dvi->conv*shrinkfactor);
CHECK_MAXDRIFT(dvi_stack->h,dvi_stack->hh);
}
break;
case SET_RULE:
DEBUG_PRINT(DEBUG_DVI,(" %d %d",
UNumRead(command+1, 4), UNumRead(command+5, 4)));
temp = SetRule(DO_VFCONV(UNumRead(command+1, 4)),
DO_VFCONV(UNumRead(command+5, 4)),
dvi_stack->hh, dvi_stack->vv);
dvi_stack->h += temp;
dvi_stack->hh += PIXROUND(temp,dvi->conv*shrinkfactor);
CHECK_MAXDRIFT(dvi_stack->h,dvi_stack->hh);
break;
case PUT_RULE:
DEBUG_PRINT(DEBUG_DVI,(" %d %d",
UNumRead(command+1, 4), UNumRead(command+5, 4)));
(void) SetRule(DO_VFCONV(UNumRead(command+1, 4)),
DO_VFCONV(UNumRead(command+5, 4)),
dvi_stack->hh, dvi_stack->vv);
break;
case BOP:
Fatal("BOP occurs within page");
break;
case EOP:
break;
case PUSH:
/* is next item on stack? */
if (dvi_stack == &stack[STACK_SIZE-1])
Fatal("DVI stack overflow");
{
struct stack_entry *next=dvi_stack+1;
next->h = dvi_stack->h;
next->v = dvi_stack->v;
next->w = dvi_stack->w;
next->x = dvi_stack->x;
next->y = dvi_stack->y;
next->z = dvi_stack->z;
next->hh = dvi_stack->hh;
next->vv = dvi_stack->vv;
dvi_stack=next;
}
break;
case POP:
if (dvi_stack == stack)
Fatal("DVI stack underflow");
dvi_stack--;
break;
case RIGHT1: case RIGHT2: case RIGHT3: case RIGHT4:
DEBUG_PRINT(DEBUG_DVI,(" %d",
SNumRead(command+1, dvi_commandlength[*command]-1)));
MoveRight(DO_VFCONV(SNumRead(command+1, dvi_commandlength[*command]-1)));
break;
case W1: case W2: case W3: case W4:
dvi_stack->w = SNumRead(command+1, dvi_commandlength[*command]-1);
DEBUG_PRINT(DEBUG_DVI,(" %d",dvi_stack->w));
case W0:
MoveRight(DO_VFCONV(dvi_stack->w));
break;
case X1: case X2: case X3: case X4:
dvi_stack->x = SNumRead(command+1, dvi_commandlength[*command]-1);
DEBUG_PRINT(DEBUG_DVI,(" %d",dvi_stack->x));
case X0:
MoveRight(DO_VFCONV(dvi_stack->x));
break;
case DOWN1: case DOWN2: case DOWN3: case DOWN4:
DEBUG_PRINT(DEBUG_DVI,(" %d",
SNumRead(command+1, dvi_commandlength[*command]-1)));
MoveDown(DO_VFCONV(SNumRead(command+1, dvi_commandlength[*command]-1)));
break;
case Y1: case Y2: case Y3: case Y4:
dvi_stack->y = SNumRead(command+1, dvi_commandlength[*command]-1);
DEBUG_PRINT(DEBUG_DVI,(" %d",dvi_stack->y));
case Y0:
MoveDown(DO_VFCONV(dvi_stack->y));
break;
case Z1: case Z2: case Z3: case Z4:
dvi_stack->z = SNumRead(command+1, dvi_commandlength[*command]-1);
DEBUG_PRINT(DEBUG_DVI,(" %d",dvi_stack->z));
case Z0:
MoveDown(DO_VFCONV(dvi_stack->z));
break;
case FNT1: case FNT2: case FNT3: case FNT4:
DEBUG_PRINT(DEBUG_DVI,(" %d",
UNumRead(command+1, dvi_commandlength[*command]-1)));
SetFntNum(UNumRead(command+1, dvi_commandlength[*command]-1),parent);
break;
case XXX1: case XXX2: case XXX3: case XXX4:
DEBUG_PRINT(DEBUG_DVI,(" %d",
UNumRead(command+1, dvi_commandlength[*command]-1)));
SetSpecial((char*)command + dvi_commandlength[*command],
(char*)command + dvi_commandlength[*command]
+UNumRead(command+1, dvi_commandlength[*command]-1),
dvi_stack->hh,dvi_stack->vv);
break;
case FNT_DEF1: case FNT_DEF2: case FNT_DEF3: case FNT_DEF4:
if (((struct font_entry*)parent)->type==DVI_TYPE) {
FontDef(command, parent);
} else {
Fatal("%s within VF macro from %s",dvi_commands[*command],
((struct font_entry*)parent)->n);
}
break;
case PRE: case POST: case POST_POST:
Fatal("%s occurs within page",dvi_commands[*command]);
break;
case NOP:
break;
default:
Fatal("%s is an undefined command",dvi_commands[*command]);
break;
}
}
void BeginVFMacro(struct font_entry* currentvf)
{
struct stack_entry *next=dvi_stack+1;
if (dvi_stack == &stack[STACK_SIZE-1])
Fatal("DVI stack overflow");
next->h = dvi_stack->h;
next->v = dvi_stack->v;
next->w = next->x = next->y = next->z = 0;
next->hh = dvi_stack->hh;
next->vv = dvi_stack->vv;
dvi_stack = next;
DEBUG_PRINT(DEBUG_DVI,("\n START VF:\tPUSH, W = X = Y = Z = 0"));
SetFntNum(currentvf->defaultfont,currentvf);
}
void EndVFMacro(void)
{
if (dvi_stack == stack)
Fatal("DVI stack underflow");
dvi_stack--;
DEBUG_PRINT(DEBUG_DVI,("\n END VF:\tPOP "));
}
static void DrawPage(dviunits hoffset, dviunits voffset)
/* To be used after having read BOP and will exit cleanly when
* encountering EOP.
*/
{
unsigned char* command; /* current command */
dvi_stack->h = hoffset;
dvi_stack->v = voffset;
dvi_stack->w = dvi_stack->x = dvi_stack->y = dvi_stack->z = 0;
dvi_stack->hh = PIXROUND( dvi_stack->h , dvi->conv*shrinkfactor );
dvi_stack->vv = PIXROUND( dvi_stack->v , dvi->conv*shrinkfactor );
currentfont = NULL; /* No default font */
command=DVIGetCommand(dvi);
DEBUG_PRINT(DEBUG_DVI,("DRAW CMD:\t%s", dvi_commands[*command]));
while (*command != EOP) {
DrawCommand(command,dvi);
command=DVIGetCommand(dvi);
DEBUG_PRINT(DEBUG_DVI,("DRAW CMD:\t%s", dvi_commands[*command]));
}
}
void DrawPages(void)
{
struct page_list *dvi_pos;
pixels x_width,y_width,x_offset,y_offset;
int pagecounter=(option_flags & DVI_PAGENUM)?0:10;
dvi_pos=NextPPage(dvi,NULL);
if (dvi_pos!=NULL) {
while(dvi_pos!=NULL) {
SeekPage(dvi,dvi_pos);
Message(BE_NONQUIET,"[%d", dvi_pos->count[pagecounter]);
if (dvi_pos->count[pagecounter]!=dvi_pos->count[0])
Message(BE_NONQUIET," (%d)", dvi_pos->count[0]);
x_max = y_max = INT32_MIN;
x_min = y_min = INT32_MAX;
DrawPage((dviunits)0,(dviunits)0);
/* Store background color. Background color of a page is given
by the color at EOP rather than the color at BOP. */
StoreBackgroundColor(dvi_pos);
/* Store pagesize */
if (dvi->flags & DVI_PREVIEW_LATEX_TIGHTPAGE) {
x_width_def=x_width_tightpage;
y_width_def=y_width_tightpage;
x_offset_def=x_offset_tightpage;
y_offset_def=y_offset_tightpage;
}
if (x_width_def >= 0) { /* extend BBOX */
min(x_min,-x_offset_def);
max(x_max,x_min + x_width_def);
min(y_min,-y_offset_def);
max(y_max,y_min + y_width_def);
}
if (x_width_def <= 0 || option_flags & EXPAND_BBOX) {
x_width = x_max-x_min;
y_width = y_max-y_min;
x_offset = -x_min; /* offset by moving topleft corner */
y_offset = -y_min; /* offset by moving topleft corner */
} else {
x_width=x_width_def;
y_width=y_width_def;
x_offset=x_offset_def;
y_offset=y_offset_def;
}
DEBUG_PRINT(DEBUG_DVI,("\n IMAGE:\t%dx%d",x_width,y_width));
SeekPage(dvi,dvi_pos);
CreateImage(x_width,y_width);
#ifdef DEBUG
DEBUG_PRINT(DEBUG_DVI,("\n@%d PAGE START:\tBOP",dvi_pos->offset));
{
int i;
for (i=0;i<10;i++)
DEBUG_PRINT(DEBUG_DVI,(" %d",dvi_pos->count[i]));
DEBUG_PRINT(DEBUG_DVI,(" (%d)\n",dvi_pos->count[10]));
}
#endif
Message(REPORT_DEPTH," depth=%d", y_width-y_offset-1);
Message(REPORT_HEIGHT," height=%d", y_offset+1);
Message(REPORT_WIDTH," width=%d", x_width);
page_flags &= ~PAGE_PREVIEW_BOP;
DrawPage(x_offset*dvi->conv*shrinkfactor,
y_offset*dvi->conv*shrinkfactor);
if ( ! (option_flags & MODE_PICKY && page_flags & PAGE_GAVE_WARN )) {
WriteImage(dvi->outname,dvi_pos->count[pagecounter]);
#ifdef TIMING
++ndone;
#endif
} else {
exitcode=EXIT_FAILURE;
Message(BE_NONQUIET,"(page not rendered)");
DestroyImage();
}
Message(BE_NONQUIET,"] ");
fflush(stdout);
page_flags = 0;
dvi_pos=NextPPage(dvi,dvi_pos);
}
Message(BE_NONQUIET,"\n");
ClearPpList();
}
}
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