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magic/graphics/grTCairo3.c

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/* grTCairo3.c -
*
* Copyright 2017 Open Circuit Design
*
* This file contains additional functions to manipulate an X window system
* color display. Included here are device-dependent routines to draw and
* erase text and draw a grid.
*
* Written by Chuan Chen
*/
#include <stdio.h>
#include <string.h>
#include <cairo/cairo-xlib.h>
#include <math.h>
#include "tcltk/tclmagic.h"
#include "utils/magic.h"
#include "utils/geometry.h"
#include "utils/malloc.h"
#include "windows/windows.h"
#include "graphics/graphics.h"
#include "graphics/graphicsInt.h"
#include "dbwind/dbwind.h"
#include "textio/textio.h"
#include "utils/signals.h"
#include "utils/utils.h"
#include "utils/hash.h"
#include "graphics/grTCairoInt.h"
#include "graphics/grTkCommon.h"
#include "database/fonts.h"
extern Display *grXdpy;
static GC grXcopyGC = (GC)NULL;
/* locals */
/*---------------------------------------------------------
* grtcairoDrawGrid:
* grxDrawGrid adds a grid to the grid layer, using the current
* write mask and color.
*
* Results:
* TRUE is returned normally. However, if the grid gets too small
* to be useful, then nothing is drawn and FALSE is returned.
*
* Side Effects: None.
*---------------------------------------------------------
*/
bool
grtcairoDrawGrid (prect, outline, clip)
Rect *prect; /* A rectangle that forms the template
* for the grid. Note: in order to maintain
* precision for the grid, the rectangle
* coordinates are specified in units of
* screen coordinates multiplied by SUBPIXEL.
*/
int outline; /* the outline style */
Rect *clip; /* a clipping rectangle */
{
int xsize, ysize;
int x, y;
int xstart, ystart;
int snum, low, hi, shifted;
TCairoData *tcairodata = (TCairoData *)tcairoCurrent.mw->w_grdata2;
xsize = prect->r_xtop - prect->r_xbot;
ysize = prect->r_ytop - prect->r_ybot;
if (!xsize || !ysize || GRID_TOO_SMALL(xsize, ysize))
return FALSE;
xstart = prect->r_xbot % xsize;
while (xstart < clip->r_xbot << SUBPIXELBITS) xstart += xsize;
ystart = prect->r_ybot % ysize;
while (ystart < clip->r_ybot << SUBPIXELBITS) ystart += ysize;
snum = 0;
low = clip->r_ybot;
hi = clip->r_ytop;
for (x = xstart; x < (clip->r_xtop + 1) << SUBPIXELBITS; x += xsize)
{
shifted = x >> SUBPIXELBITS;
cairo_move_to(tcairodata->context, (double)shifted, (double)low);
cairo_line_to(tcairodata->context, (double)shifted, (double)hi);
snum++;
}
snum = 0;
low = clip->r_xbot;
hi = clip->r_xtop;
for (y = ystart; y < (clip->r_ytop + 1) << SUBPIXELBITS; y += ysize)
{
shifted = y >> SUBPIXELBITS;
cairo_move_to(tcairodata->context, (double)low, (double)shifted);
cairo_line_to(tcairodata->context, (double)hi, (double)shifted);
snum++;
}
cairo_stroke(tcairodata->context);
return TRUE;
}
/*---------------------------------------------------------
* grtcairoLoadFont
* This local routine loads the default ("toy API")
* font for Cairo.
*
* Results: Success/Failure
*
* Side Effects: None.
*---------------------------------------------------------
*/
bool
grtcairoLoadFont()
{
TCairoData *tcairodata = (TCairoData *)tcairoCurrent.mw->w_grdata2;
cairo_select_font_face(tcairodata->context, "sans-serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
return TRUE;
}
/*---------------------------------------------------------
* grtcairoSetCharSize:
* This local routine sets the character size in the display,
* if necessary.
*
* Results: None.
*
* Side Effects: None.
*---------------------------------------------------------
*/
void
grtcairoSetCharSize (size)
int size; /* Width of characters, in pixels (6 or 8). */
{
TCairoData *tcairodata = (TCairoData *)tcairoCurrent.mw->w_grdata2;
tcairoCurrent.fontSize = size;
cairo_set_font_size(tcairodata->context, size * 4 + 10);
switch (size)
{
case GR_TEXT_DEFAULT:
case GR_TEXT_SMALL:
tcairoCurrent.font = grSmallFont;
break;
case GR_TEXT_MEDIUM:
tcairoCurrent.font = grMediumFont;
break;
case GR_TEXT_LARGE:
tcairoCurrent.font = grLargeFont;
break;
case GR_TEXT_XLARGE:
tcairoCurrent.font = grXLargeFont;
break;
default:
TxError("%s%d\n", "grtcairoSetCharSize: Unknown character size ",
size );
break;
}
}
/*
* ----------------------------------------------------------------------------
* GrTCairoTextSize --
*
* Determine the size of a text string.
*
* Results:
* Return 0 when 'r' updated, otherwise -1 on error (no side-effects).
*
* Side effects:
* A rectangle is filled in that is the size of the text in pixels.
* The origin (0, 0) of this rectangle is located on the baseline
* at the far left side of the string.
* ----------------------------------------------------------------------------
*/
int
GrTCairoTextSize(text, size, r)
char *text;
int size;
Rect *r;
{
TCairoData *tcairodata;
cairo_text_extents_t extents;
int width;
/* Note: size is ignored, as it is passed the current value; */
/* but the font size in cairo has already been set. */
if (tcairoCurrent.mw == 0) return -1;
tcairodata = (TCairoData *)tcairoCurrent.mw->w_grdata2;
cairo_text_extents(tcairodata->context, text, &extents);
r->r_ytop = -extents.y_bearing;
r->r_ybot = -(extents.height + extents.y_bearing);
r->r_xtop = extents.width + extents.x_bearing;
r->r_xbot = extents.x_bearing;
return 0;
}
/* Cairo backing store functions (now removed from the X11-based ones) */
void
grtcairoFreeBackingStore(MagWindow *window)
{
TCairoData *tcairodata;
Pixmap pmap = (Pixmap)window->w_backingStore;
if (pmap == (Pixmap)NULL) return;
XFreePixmap(grXdpy, pmap);
window->w_backingStore = (ClientData)NULL;
tcairodata = (TCairoData *)window->w_grdata2;
cairo_surface_destroy(tcairodata->backing_surface);
cairo_destroy(tcairodata->backing_context);
tcairodata->backing_surface = NULL;
tcairodata->backing_context = NULL;
}
void
grtcairoCreateBackingStore(MagWindow *w)
{
Pixmap pmap;
TCairoData *tcairodata;
Tk_Window tkwind = (Tk_Window)w->w_grdata;
Window wind;
unsigned int width, height;
GC gc;
XGCValues gcValues;
int grDepth;
/* Deferred */
if (tkwind == NULL) return;
wind = (Window)Tk_WindowId(tkwind);
/* ignore all windows other than layout */
if (w->w_client != DBWclientID) return;
/* deferred */
if (wind == (Window)NULL) return;
width = w->w_screenArea.r_xtop - w->w_screenArea.r_xbot;
height = w->w_screenArea.r_ytop - w->w_screenArea.r_ybot;
if (w->w_backingStore != (ClientData)NULL) grtcairoFreeBackingStore(w);
if (grXcopyGC == (GC)NULL)
{
gcValues.graphics_exposures = FALSE;
grXcopyGC = XCreateGC(grXdpy, wind, GCGraphicsExposures, &gcValues);
}
grDepth = Tk_Depth((Tk_Window)w->w_grdata);
pmap = XCreatePixmap(grXdpy, wind, width, height, grDepth);
w->w_backingStore = (ClientData)pmap;
tcairodata = (TCairoData *)w->w_grdata2;
if (tcairodata->backing_surface != NULL)
{
cairo_surface_destroy(tcairodata->backing_surface);
cairo_destroy(tcairodata->backing_context);
}
tcairodata->backing_surface = cairo_xlib_surface_create(grXdpy, pmap,
DefaultVisual(grXdpy, DefaultScreen(grXdpy)), width, height);
tcairodata->backing_context = cairo_create(tcairodata->backing_surface);
cairo_identity_matrix(tcairodata->backing_context);
}
bool
grtcairoGetBackingStore(MagWindow *w, Rect *area)
{
unsigned int width, height, sheight;
int xbot, ybot;
Rect r;
TCairoData *tcairodata = (TCairoData *)w->w_grdata2;
if (w->w_backingStore == (ClientData)0) return FALSE;
GEO_EXPAND(area, 1, &r);
GeoClip(&r, &(w->w_screenArea));
xbot = r.r_xbot;
ybot = r.r_ybot;
width = r.r_xtop - xbot;
height = r.r_ytop - ybot;
sheight = w->w_screenArea.r_ytop - w->w_screenArea.r_ybot;
// Fix Y orientation
ybot = sheight - height - ybot;
cairo_save(tcairodata->context);
cairo_identity_matrix(tcairodata->context);
cairo_set_source_surface(tcairodata->context, tcairodata->backing_surface,
0.0, 0.0);
cairo_rectangle(tcairodata->context, (double)xbot, (double)ybot,
(double)width, (double)height);
cairo_set_operator(tcairodata->context, CAIRO_OPERATOR_SOURCE);
cairo_fill(tcairodata->context);
cairo_restore(tcairodata->context);
return TRUE;
}
bool
grtcairoScrollBackingStore(MagWindow *w, Point *shift)
{
TCairoData *tcairodata = (TCairoData *)w->w_grdata2;
Pixmap pmap;
unsigned int width, height;
int xorigin, yorigin, xshift, yshift;
pmap = (Pixmap)w->w_backingStore;
if (pmap == (Pixmap)NULL)
{
TxPrintf("grtcairoScrollBackingStore %d %d failure\n",
shift->p_x, shift->p_y);
return FALSE;
}
width = w->w_screenArea.r_xtop - w->w_screenArea.r_xbot;
height = w->w_screenArea.r_ytop - w->w_screenArea.r_ybot;
xorigin = 0;
yorigin = 0;
xshift = shift->p_x;
yshift = -shift->p_y;
/* Important: Cairo does not watch where memory overlaps exist */
/* when copying and will erase memory when yshift is positive. */
if (yshift > 0)
{
/* Noting that the highlights will be redrawn anyway, use */
/* the main window surface as an intermediary to copy. */
Rect area;
cairo_save(tcairodata->context);
cairo_identity_matrix(tcairodata->context);
cairo_set_source_surface(tcairodata->context,
tcairodata->backing_surface, (double)xshift, (double)yshift);
cairo_rectangle(tcairodata->context, (double)xorigin,
(double)yorigin, (double)width, (double)height);
cairo_set_operator(tcairodata->context, CAIRO_OPERATOR_SOURCE);
cairo_fill(tcairodata->context);
cairo_restore(tcairodata->context);
area.r_xbot = 0;
area.r_xtop = width;
area.r_ybot = 0;
area.r_ytop = height;
grtcairoPutBackingStore(w, &area);
}
else
{
cairo_save(tcairodata->backing_context);
cairo_set_source_surface(tcairodata->backing_context,
tcairodata->backing_surface, (double)xshift, (double)yshift);
cairo_rectangle(tcairodata->backing_context, (double)xorigin,
(double)yorigin, (double)width, (double)height);
cairo_set_operator(tcairodata->backing_context, CAIRO_OPERATOR_SOURCE);
cairo_fill(tcairodata->backing_context);
cairo_restore(tcairodata->backing_context);
}
return TRUE;
}
void
grtcairoPutBackingStore(MagWindow *w, Rect *area)
{
unsigned int width, height, sheight;
int ybot, xbot;
TCairoData *tcairodata = (TCairoData *)w->w_grdata2;
if (w->w_backingStore == (ClientData)0) return;
if (w->w_flags & WIND_OBSCURED)
{
grtcairoFreeBackingStore(w);
return;
}
xbot = area->r_xbot;
ybot = area->r_ybot;
width = area->r_xtop - xbot;
height = area->r_ytop - ybot;
sheight = w->w_screenArea.r_ytop - w->w_screenArea.r_ybot;
// Fix Y orientation
ybot = sheight - height - ybot;
cairo_save(tcairodata->backing_context);
cairo_set_source_surface(tcairodata->backing_context, tcairodata->surface,
0.0, 0.0);
cairo_rectangle(tcairodata->backing_context, (double)xbot, (double)ybot,
(double)width, (double)height);
cairo_set_operator(tcairodata->backing_context, CAIRO_OPERATOR_SOURCE);
cairo_fill(tcairodata->backing_context);
cairo_restore(tcairodata->backing_context);
}
/*
* ----------------------------------------------------------------------------
* GrTCairoReadPixel --
*
* Read one pixel from the screen.
*
* Results:
* An integer containing the pixel's color.
*
* Side effects:
* none.
*
* ----------------------------------------------------------------------------
*/
int
GrTCairoReadPixel (w, x, y)
MagWindow *w;
int x, y; /* the location of a pixel in screen coords */
{
return 0; /* (unimplemented) */
}
/*
* ----------------------------------------------------------------------------
* GrTCairoBitBlt --
*
* Copy information in bit block transfers.
*
* Results:
* None.
*
* Side effects:
* changes the screen.
* ----------------------------------------------------------------------------
*/
void
GrTCairoBitBlt(r, p)
Rect *r;
Point *p;
{
// (unimplemented)
}
#ifdef VECTOR_FONTS
/*
*----------------------------------------------------------------------
* Draw a text character
* This routine is similar to grtcairoFillPolygon()
*----------------------------------------------------------------------
*/
void
grtcairoDrawCharacter(clist, tc, pixsize)
FontChar *clist;
unsigned char tc;
int pixsize;
{
Point *tp;
int np, nptotal;
int i;
static int maxnp = 0;
FontChar *ccur;
TCairoData *tcairodata = (TCairoData *)tcairoCurrent.mw->w_grdata2;
if (pixsize < 5) return; /* Label too small to be useful */
//should we be using cairo_show_glyphs??
for (ccur = clist; ccur != NULL; ccur = ccur->fc_next) {
tp = ccur->fc_points;
np = ccur->fc_numpoints;
cairo_move_to(tcairodata->context, (double)tp[0].p_x, (double)tp[0].p_y);
for (i = 1; i < np; i++) {
cairo_line_to(tcairodata->context, (double)tp[i].p_x,
(double)tp[i].p_y);
}
cairo_close_path(tcairodata->context);
}
cairo_fill(tcairodata->context);
}
/*---------------------------------------------------------
* grtcairoFontText:
*
* This routine draws text from font vectors using the
* font vector routines in DBlabel.c. Text is clipped
* to the clipping rectangle.
*
* For speed, should we be transferring the font
* vectors into cairo glyphs?
*
*---------------------------------------------------------
*/
void
grtcairoFontText(text, font, size, rotate, pos, clip, obscure)
char *text; /* The text to be drawn */
int font; /* Font to use from fontList */
int size; /* Pixel size of the font */
int rotate; /* Text rotation */
Point *pos; /* Text base position */
Rect *clip; /* Clipping area */
LinkedRect *obscure; /* List of obscuring areas */
{
char *tptr;
Point *coffset; /* vector to next character */
Rect *cbbox;
float fsize;
FontChar *clist;
int cheight, baseline;
float tmp;
TCairoData *tcairodata = (TCairoData *)tcairoCurrent.mw->w_grdata2;
cairo_save(tcairodata->context);
cairo_set_operator(tcairodata->context, CAIRO_OPERATOR_SOURCE);
cairo_translate(tcairodata->context, (double)pos->p_x, (double)pos->p_y);
// cairo_scale(tcairodata->context, 1.0, -1.0);
cairo_rotate(tcairodata->context, ((double)rotate) / 360 * 2 * M_PI);
/* Get label size */
cbbox = &DBFontList[font]->mf_extents;
fsize = (float)size / (float)cbbox->r_ytop;
cairo_scale(tcairodata->context, (double)fsize, (double)fsize);
/* Adjust to baseline */
baseline = 0;
for (tptr = text; *tptr != '\0'; tptr++)
{
DBFontChar(font, *tptr, NULL, NULL, &cbbox);
if (cbbox->r_ybot < baseline)
baseline = cbbox->r_ybot;
}
cairo_translate(tcairodata->context, 0.0, (double)(-baseline));
for (tptr = text; *tptr != '\0'; tptr++)
{
DBFontChar(font, *tptr, &clist, &coffset, NULL);
grtcairoDrawCharacter(clist, *tptr, size);
cairo_translate(tcairodata->context, (double)coffset->p_x,
(double)coffset->p_y);
}
cairo_restore(tcairodata->context);
}
#endif /* VECTOR_FONTS */
/*---------------------------------------------------------
* grtcairoPutText:
*
* This routine puts a chunk of text on the screen in the current
* color, size, etc. The caller must ensure that it fits on
* the screen -- no clipping is done except to the obscuring rectangle
* list and the clip rectangle.
*
* Results:
* none.
*
* Side Effects:
* The text is drawn on the screen.
*
*---------------------------------------------------------
*/
void
grtcairoPutText (text, pos, clip, obscure)
char *text; /* The text to be drawn. */
Point *pos; /* A point located at the leftmost point of
* the baseline for this string.
*/
Rect *clip; /* A rectangle to clip against */
LinkedRect *obscure; /* A list of obscuring rectangles */
{
Rect location;
Rect overlap;
Rect textrect;
LinkedRect *ob;
void grTCairoGeoSub();
int i;
float tscale;
TCairoData *tcairodata = (TCairoData *)tcairoCurrent.mw->w_grdata2;
if (GrTCairoTextSize(text, tcairoCurrent.fontSize, &textrect) < 0) return;
location.r_xbot = pos->p_x + textrect.r_xbot;
location.r_xtop = pos->p_x + textrect.r_xtop;
location.r_ybot = pos->p_y + textrect.r_ybot;
location.r_ytop = pos->p_y + textrect.r_ytop;
/* erase parts of the bitmap that are obscured */
for (ob = obscure; ob != NULL; ob = ob->r_next)
{
if (GEO_TOUCH(&ob->r_r, &location))
{
overlap = location;
GeoClip(&overlap, &ob->r_r);
grTCairoGeoSub(&location, &overlap);
}
}
overlap = location;
GeoClip(&overlap, clip);
if ((overlap.r_xbot < overlap.r_xtop) && (overlap.r_ybot <= overlap.r_ytop))
{
cairo_save(tcairodata->context);
/* Clip text to the clip rectangle */
cairo_rectangle(tcairodata->context,
(double)clip->r_xbot, (double)clip->r_ybot,
(double)(clip->r_xtop - clip->r_xbot),
(double)(clip->r_ytop - clip->r_ybot));
cairo_clip(tcairodata->context);
cairo_move_to(tcairodata->context, (double)location.r_xbot,
(double)location.r_ybot);
/* The cairo coordinate system is upside-down, so invert */
cairo_scale(tcairodata->context, 1.0, -1.0);
cairo_set_operator(tcairodata->context, CAIRO_OPERATOR_SOURCE);
cairo_show_text(tcairodata->context, text);
cairo_fill(tcairodata->context);
cairo_restore(tcairodata->context);
}
}
/* grTCairoGeoSub:
* return the tallest sub-rectangle of r not obscured by area
* area must be within r.
*/
void
grTCairoGeoSub(r, area)
Rect *r; /* Rectangle to be subtracted from. */
Rect *area; /* Area to be subtracted. */
{
if (r->r_xbot == area->r_xbot) r->r_xbot = area->r_xtop;
else if (r->r_xtop == area->r_xtop) r->r_xtop = area->r_xbot;
else if (r->r_ybot <= area->r_ybot) r->r_ybot = area->r_ytop;
else if (r->r_ytop == area->r_ytop) r->r_ytop = area->r_ybot;
else
r->r_xtop = area->r_xbot;
}
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