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Documentation: add doc for Fl_Graphics_Driver::cache_size()

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git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12856 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Manolo Gouy 2018-04-19 08:29:33 +00:00
parent 0196998ea6
commit eb3664edf1
1 changed files with 14 additions and 11 deletions
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25
src/Fl_Graphics_Driver.cxx
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@ -196,6 +196,20 @@ bool Fl_Graphics_Driver::overlay_rect_unscaled()
return (scale() == int(scale())); return (scale() == int(scale()));
} }
/** Converts \p width and \p height from FLTK units to drawing units.
The conversion performed consists in multiplying \p width and \p height by
scale() and in slightly modifying that to help support tiled images. */
void Fl_Graphics_Driver::cache_size(Fl_Image *img, int &width, int &height)
{
if ( int(scale_) == scale_ ) {
width = width * scale_;
height = height * scale_;
} else {
width = (width+1) * scale_;
height = (height+1) * scale_;
}
}
#ifndef FL_DOXYGEN #ifndef FL_DOXYGEN
Fl_Font_Descriptor::Fl_Font_Descriptor(const char* name, Fl_Fontsize Size) { Fl_Font_Descriptor::Fl_Font_Descriptor(const char* name, Fl_Fontsize Size) {
next = 0; next = 0;
@ -299,17 +313,6 @@ void Fl_Scalable_Graphics_Driver::circle(double x, double y, double r) {
ellipse_unscaled(xt*scale_, yt*scale_, rx*scale_, ry*scale_); ellipse_unscaled(xt*scale_, yt*scale_, rx*scale_, ry*scale_);
} }
// compute width & height of cached image so it can be tiled without undrawn gaps when scaling output
void Fl_Graphics_Driver::cache_size(Fl_Image *img, int &width, int &height)
{
if ( int(scale_) == scale_ ) {
width = width * scale_;
height = height * scale_;
} else {
width = (width+1) * scale_;
height = (height+1) * scale_;
}
}
void Fl_Graphics_Driver::draw_pixmap(Fl_Pixmap *pxm, int XP, int YP, int WP, int HP, int cx, int cy) { void Fl_Graphics_Driver::draw_pixmap(Fl_Pixmap *pxm, int XP, int YP, int WP, int HP, int cx, int cy) {