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-rw-r--r--src/fl_line_style.cxx11
-rw-r--r--src/fl_rect.cxx174
2 files changed, 115 insertions, 70 deletions
diff --git a/src/fl_line_style.cxx b/src/fl_line_style.cxx
index 18b27be8d..87f00678c 100644
--- a/src/fl_line_style.cxx
+++ b/src/fl_line_style.cxx
@@ -3,7 +3,7 @@
//
// Line style code for the Fast Light Tool Kit (FLTK).
//
-// Copyright 1998-2009 by Bill Spitzak and others.
+// Copyright 1998-2010 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
@@ -37,6 +37,11 @@
#include "flstring.h"
#include <stdio.h>
+// We save the current line width (absolute value) here.
+// This is currently used only for X11 clipping, see src/fl_rect.cxx.
+// FIXME: this would probably better be in class Fl::
+int fl_line_width_ = 0;
+
#ifdef __APPLE_QUARTZ__
float fl_quartz_line_width_ = 1.0f;
static enum CGLineCap fl_quartz_line_cap_ = kCGLineCapButt;
@@ -53,6 +58,10 @@ void fl_quartz_restore_line_style_() {
void Fl_Graphics_Driver::line_style(int style, int width, char* dashes) {
+ // save line width in global variable for X11 clipping
+ if (width == 0) fl_line_width_ = 1;
+ else fl_line_width_ = width>0 ? width : -width;
+
#if defined(USE_X11)
int ndashes = dashes ? strlen(dashes) : 0;
// emulate the WIN32 dash patterns on X
diff --git a/src/fl_rect.cxx b/src/fl_rect.cxx
index 6fce9b912..5f739fa23 100644
--- a/src/fl_rect.cxx
+++ b/src/fl_rect.cxx
@@ -3,7 +3,7 @@
//
// Rectangle drawing routines for the Fast Light Tool Kit (FLTK).
//
-// Copyright 1998-2009 by Bill Spitzak and others.
+// Copyright 1998-2010 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
@@ -42,50 +42,119 @@
#include <FL/fl_draw.H>
#include <FL/x.H>
+// fl_line_width_ must contain the absolute value of the current
+// line width to be used for X11 clipping (see below).
+// This is defined in src/fl_line_style.cxx
+extern int fl_line_width_;
+
#ifdef __APPLE_QUARTZ__
extern float fl_quartz_line_width_;
#define USINGQUARTZPRINTER (Fl_Surface_Device::surface()->type() == Fl_Printer::device_type)
#endif
#ifdef USE_X11
-
+
#ifndef SHRT_MAX
#define SHRT_MAX (32767)
#endif
/*
We need to check some coordinates for areas for clipping before we
- use X calls, because X can't handle coordinates outside the 16-bit
- range. Since windows use relative coordinates > 0, we do also check
- for negative values. X11 only, see also STR #2304.
+ use X functions, because X can't handle coordinates outside the 16-bit
+ range. Since all windows use relative coordinates > 0, we do also
+ check for negative values. X11 only, see also STR #2304.
+
+ Note that this is only necessary for large objects, where only a
+ part of the object is visible. The draw() functions (e.g. box
+ drawing) must be clipped correctly. This is usually only a matter
+ for large container widgets. The individual child widgets will be
+ clipped completely.
+
+ We define the usable X coordinate space as [ -LW : SHRT_MAX - LW ]
+ where LW = current line width for drawing. This is done so that
+ horizontal and vertical line drawing works correctly, even in real
+ border cases, e.g. drawing a rectangle slightly outside the top left
+ window corner, but with a line width so that a part of the line should
+ be visible (in this case 2 of 5 pixels):
+
+ fl_line_style (FL_SOLID,5); // line width = 5
+ fl_rect (-1,-1,100,100); // top/left: 2 pixels visible
+
+ In this example case, no clipping would be done, because X can
+ handle it and clip unneeded pixels.
+
+ Todo: Arbitrary line drawings (e.g. polygons) and clip regions
+ are not yet done.
Note:
+
We could use max. screen coordinates instead of SHRT_MAX, but that
- would need more work and would probably be slower.
+ would need more work and would probably be slower. We assume that
+ all window coordinates are >= 0 and that no window extends up to
+ 32767 - LW (where LW = current line width). Thus it is safe to clip
+ all coordinates to this range before calling X functions. If this
+ is not true, then clip_to_short() and clip_x() must be redefined.
+
+ It would be somewhat easier if we had fl_clip_w and fl_clip_h, as
+ defined in FLTK 2.0 (for the upper clipping bounds)...
+*/
+
+/*
+ clip_to_short() returns 1, if the area is invisible (clipped),
+ because ...
- returns 1, if the area is invisible (clipped), because ...
(a) w or h are <= 0 i.e. nothing is visible
- (b) x+w or y+h are < 0 i.e. left of or above visible area
- (c) x or y are > SHRT_MAX i.e. right of or below visible area
+ (b) x+w or y+h are < kmin i.e. left of or above visible area
+ (c) x or y are > kmax i.e. right of or below visible area
+
+ kmin and kmax are the minimal and maximal X coordinate values,
+ as defined above. In this case x, y, w, and h are not changed.
- returns 0, if the area is potentially visible and X can handle the
- clipping. x, y, w, and h may have been adjusted to fit into the
- X coordinate space.
+ It returns 0, if the area is potentially visible and X can handle
+ clipping. x, y, w, and h may have been adjusted to fit into the
+ X coordinate space.
+
+ Use this for clipping rectangles, as used in fl_rect() and
+ fl_rectf().
*/
+
static int clip_to_short(int &x, int &y, int &w, int &h) {
+ int kmin = -fl_line_width_;
+ int kmax = SHRT_MAX - fl_line_width_;
+
if (w <= 0 || h <= 0) return 1; // (a)
- if (x+w < 0 || y+h < 0) return 1; // (b)
- if (x > SHRT_MAX || y > SHRT_MAX) return 1; // (c)
+ if (x+w < kmin || y+h < kmin) return 1; // (b)
+ if (x > kmax || y > kmax) return 1; // (c)
- if (x < 0) { w += x; x = 0; }
- if (y < 0) { h += y; y = 0; }
- if (x+w > SHRT_MAX) w = SHRT_MAX - x;
- if (y+h > SHRT_MAX) h = SHRT_MAX - y;
+ if (x < kmin) { w -= (kmin-x); x = kmin; }
+ if (y < kmin) { h -= (kmin-y); y = kmin; }
+ if (x+w > kmax) w = kmax - x;
+ if (y+h > kmax) h = kmax - y;
return 0;
}
+/*
+ clip_x() returns a coordinate value clipped to the 16-bit coordinate
+ space (see above). This can be used to draw horizontal and vertical
+ lines that can be handled by X11. Each single coordinate value can
+ be clipped individually, and the result can be used directly, e.g.
+ in fl_xyline() and fl_yxline(). Note that this can't be used for
+ arbitrary lines (not horizontal or vertical).
+*/
+int clip_x (int x) {
+
+ int kmin = -fl_line_width_;
+ int kmax = SHRT_MAX - fl_line_width_;
+
+ if (x < kmin)
+ x = kmin;
+ else if (x > kmax)
+ x = kmax;
+ return x;
+}
+
#endif // USE_X11
@@ -93,15 +162,7 @@ void Fl_Graphics_Driver::rect(int x, int y, int w, int h) {
if (w<=0 || h<=0) return;
#if defined(USE_X11)
- if (x+w < 0 || y+h < 0 || x > SHRT_MAX || y > SHRT_MAX ) return;
-
- if (x+w > SHRT_MAX || y+h > SHRT_MAX ||
- w > SHRT_MAX || h > SHRT_MAX) { // X can't handle clipping
- xyline(x, y, x+w-1);
- yxline(x+w-1, y, y+h-1);
- xyline(x+w-1, y+h-1, x);
- yxline(x, y+h-1, y);
- } else
+ if (!clip_to_short(x, y, w, h))
XDrawRectangle(fl_display, fl_window, fl_gc, x, y, w-1, h-1);
#elif defined(WIN32)
MoveToEx(fl_gc, x, y, 0L);
@@ -122,10 +183,8 @@ void Fl_Graphics_Driver::rect(int x, int y, int w, int h) {
void Fl_Graphics_Driver::rectf(int x, int y, int w, int h) {
if (w<=0 || h<=0) return;
#if defined(USE_X11)
- if (w && h) {
- if (!clip_to_short(x,y,w,h))
- XFillRectangle(fl_display, fl_window, fl_gc, x, y, w, h);
- }
+ if (!clip_to_short(x, y, w, h))
+ XFillRectangle(fl_display, fl_window, fl_gc, x, y, w, h);
#elif defined(WIN32)
RECT rect;
rect.left = x; rect.top = y;
@@ -143,18 +202,7 @@ void Fl_Graphics_Driver::rectf(int x, int y, int w, int h) {
void Fl_Graphics_Driver::xyline(int x, int y, int x1) {
#if defined(USE_X11)
- // get rid of coordinates outside the 16-bit range
- if (y < 0 || y > SHRT_MAX) return;
- if (x <= x1) {
- if (x1 < 0 || x > SHRT_MAX) return;
- if (x < 0) x = 0;
- if (x1 > SHRT_MAX) x1 = SHRT_MAX;
- } else { // x1 < x
- if (x < 0 || x1 > SHRT_MAX) return;
- if (x1 < 0) x1 = 0;
- if (x > SHRT_MAX) x = SHRT_MAX;
- }
- XDrawLine(fl_display, fl_window, fl_gc, x, y, x1, y);
+ XDrawLine(fl_display, fl_window, fl_gc, clip_x(x), clip_x(y), clip_x(x1), clip_x(y));
#elif defined(WIN32)
MoveToEx(fl_gc, x, y, 0L); LineTo(fl_gc, x1+1, y);
#elif defined(__APPLE_QUARTZ__)
@@ -171,8 +219,8 @@ void Fl_Graphics_Driver::xyline(int x, int y, int x1) {
void Fl_Graphics_Driver::xyline(int x, int y, int x1, int y2) {
#if defined (USE_X11)
XPoint p[3];
- p[0].x = x; p[0].y = p[1].y = y;
- p[1].x = p[2].x = x1; p[2].y = y2;
+ p[0].x = clip_x(x); p[0].y = p[1].y = clip_x(y);
+ p[1].x = p[2].x = clip_x(x1); p[2].y = clip_x(y2);
XDrawLines(fl_display, fl_window, fl_gc, p, 3, 0);
#elif defined(WIN32)
if (y2 < y) y2--;
@@ -195,9 +243,9 @@ void Fl_Graphics_Driver::xyline(int x, int y, int x1, int y2) {
void Fl_Graphics_Driver::xyline(int x, int y, int x1, int y2, int x3) {
#if defined(USE_X11)
XPoint p[4];
- p[0].x = x; p[0].y = p[1].y = y;
- p[1].x = p[2].x = x1; p[2].y = p[3].y = y2;
- p[3].x = x3;
+ p[0].x = clip_x(x); p[0].y = p[1].y = clip_x(y);
+ p[1].x = p[2].x = clip_x(x1); p[2].y = p[3].y = clip_x(y2);
+ p[3].x = clip_x(x3);
XDrawLines(fl_display, fl_window, fl_gc, p, 4, 0);
#elif defined(WIN32)
if(x3 < x1) x3--;
@@ -221,18 +269,7 @@ void Fl_Graphics_Driver::xyline(int x, int y, int x1, int y2, int x3) {
void Fl_Graphics_Driver::yxline(int x, int y, int y1) {
#if defined(USE_X11)
- // get rid of coordinates outside the 16-bit range
- if (x < 0 || x > SHRT_MAX) return;
- if (y <= y1) {
- if (y1 < 0 || y > SHRT_MAX) return;
- if (y < 0) y = 0;
- if (y1 > SHRT_MAX) y1 = SHRT_MAX;
- } else { // y1 < y
- if (y < 0 || y1 > SHRT_MAX) return;
- if (y1 < 0) y1 = 0;
- if (y > SHRT_MAX) y = SHRT_MAX;
- }
- XDrawLine(fl_display, fl_window, fl_gc, x, y, x, y1);
+ XDrawLine(fl_display, fl_window, fl_gc, clip_x(x), clip_x(y), clip_x(x), clip_x(y1));
#elif defined(WIN32)
if (y1 < y) y1--;
else y1++;
@@ -251,8 +288,8 @@ void Fl_Graphics_Driver::yxline(int x, int y, int y1) {
void Fl_Graphics_Driver::yxline(int x, int y, int y1, int x2) {
#if defined(USE_X11)
XPoint p[3];
- p[0].x = p[1].x = x; p[0].y = y;
- p[1].y = p[2].y = y1; p[2].x = x2;
+ p[0].x = p[1].x = clip_x(x); p[0].y = clip_x(y);
+ p[1].y = p[2].y = clip_x(y1); p[2].x = clip_x(x2);
XDrawLines(fl_display, fl_window, fl_gc, p, 3, 0);
#elif defined(WIN32)
if (x2 > x) x2++;
@@ -275,9 +312,9 @@ void Fl_Graphics_Driver::yxline(int x, int y, int y1, int x2) {
void Fl_Graphics_Driver::yxline(int x, int y, int y1, int x2, int y3) {
#if defined(USE_X11)
XPoint p[4];
- p[0].x = p[1].x = x; p[0].y = y;
- p[1].y = p[2].y = y1; p[2].x = p[3].x = x2;
- p[3].y = y3;
+ p[0].x = p[1].x = clip_x(x); p[0].y = clip_x(y);
+ p[1].y = p[2].y = clip_x(y1); p[2].x = p[3].x = clip_x(x2);
+ p[3].y = clip_x(y3);
XDrawLines(fl_display, fl_window, fl_gc, p, 4, 0);
#elif defined(WIN32)
if(y3<y1) y3--;
@@ -454,7 +491,7 @@ void Fl_Graphics_Driver::polygon(int x, int y, int x1, int y1, int x2, int y2, i
void Fl_Graphics_Driver::point(int x, int y) {
#if defined(USE_X11)
- XDrawPoint(fl_display, fl_window, fl_gc, x, y);
+ XDrawPoint(fl_display, fl_window, fl_gc, clip_x(x), clip_x(y));
#elif defined(WIN32)
SetPixel(fl_gc, x, y, fl_RGB());
#elif defined(__APPLE_QUARTZ__)
@@ -481,6 +518,7 @@ int fl_clip_state_number=0; // used by gl_begin.cxx to update GL clip
// MSWindows equivalent exists, implemented inline in win32.H
Fl_Region XRectangleRegion(int x, int y, int w, int h) {
XRectangle R;
+ clip_to_short(x, y, w, h);
R.x = x; R.y = y; R.width = w; R.height = h;
Fl_Region r = XCreateRegion();
XUnionRectWithRegion(&R, r, r);
@@ -582,13 +620,12 @@ void Fl_Graphics_Driver::pop_clip() {
int Fl_Graphics_Driver::not_clipped(int x, int y, int w, int h) {
if (x+w <= 0 || y+h <= 0) return 0;
Fl_Region r = rstack[rstackptr];
-#if defined (USE_X11)
if (!r) return 1;
+#if defined (USE_X11)
// get rid of coordinates outside the 16-bit range the X calls take.
if (clip_to_short(x,y,w,h)) return 0; // clipped
return XRectInRegion(r, x, y, w, h);
#elif defined(WIN32)
- if (!r) return 1;
RECT rect;
if (Fl_Surface_Device::surface()->type() == Fl_Printer::device_type) { // in case of print context, convert coords from logical to device
POINT pt[2] = { {x, y}, {x + w, y + h} };
@@ -599,7 +636,6 @@ int Fl_Graphics_Driver::not_clipped(int x, int y, int w, int h) {
}
return RectInRegion(r,&rect);
#elif defined(__APPLE_QUARTZ__)
- if (!r) return 1;
CGRect arg = fl_cgrectmake_cocoa(x, y, w, h);
for (int i = 0; i < r->count; i++) {
CGRect test = CGRectIntersection(r->rects[i], arg);
generated by cgit v1.2.3 (git 2.25.1) at 2026-02-08 12:47:55 +0000