mirror of https://github.com/fltk/fltk
Fast pango (#201)
* Cache single unicode character widths under Xft+Pango
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@ -472,7 +472,6 @@ void Fl_Text_Display::resize(int X, int Y, int W, int H) {
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*/
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void Fl_Text_Display::recalc_display() {
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if (!buffer()) return;
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// did we have scrollbars initially?
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unsigned int hscrollbarvisible = mHScrollBar->visible();
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unsigned int vscrollbarvisible = mVScrollBar->visible();
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@ -36,6 +36,7 @@ public:
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# if USE_PANGO
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int descent_;
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int height_;
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int **width;
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# else
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XftFont* font;
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# endif
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@ -62,6 +62,9 @@ private:
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virtual void draw_fixed(Fl_Pixmap *pxm, int XP, int YP, int WP, int HP, int cx, int cy);
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virtual void draw_fixed(Fl_Bitmap *pxm, int XP, int YP, int WP, int HP, int cx, int cy);
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virtual void draw_fixed(Fl_RGB_Image *rgb, int XP, int YP, int WP, int HP, int cx, int cy);
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#if USE_PANGO
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double do_width_unscaled_(const char *str, int n);
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#endif
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protected:
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virtual void draw_image_unscaled(const uchar* buf, int X,int Y,int W,int H, int D=3, int L=0);
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virtual void draw_image_unscaled(Fl_Draw_Image_Cb cb, void* data, int X,int Y,int W,int H, int D=3);
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@ -1012,6 +1012,10 @@ float Fl_Xlib_Graphics_Driver::scale_bitmap_for_PostScript() {
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Fl_Xlib_Font_Descriptor::~Fl_Xlib_Font_Descriptor() {
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if (this == fl_graphics_driver->font_descriptor()) fl_graphics_driver->font_descriptor(NULL);
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// XftFontClose(fl_display, font);
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#if USE_PANGO
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if (width) for (int i = 0; i < 64; i++) delete[] width[i];
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delete[] width;
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#endif
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}
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@ -1347,7 +1351,45 @@ void Fl_Xlib_Graphics_Driver::do_draw(int from_right, const char *str, int n, in
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(y - y_correction - lheight + desc) * PANGO_SCALE ); // 1.8
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}
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// cache the widths of single Unicode characters
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double Fl_Xlib_Graphics_Driver::width_unscaled(unsigned int utf32) {
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unsigned r=0;
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Fl_Xlib_Font_Descriptor *desc = NULL;
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if (utf32 <= 0xFFFF) {
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desc = (Fl_Xlib_Font_Descriptor*)font_descriptor();
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r = (utf32 & 0xFC00) >> 10;
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if (!desc->width) {
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desc->width = (int**)new int*[64];
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memset(desc->width, 0, 64*sizeof(int*));
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}
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if (!desc->width[r]) {
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desc->width[r] = (int*)new int[0x0400];
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for (int i = 0; i < 0x0400; i++) desc->width[r][i] = -1;
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} else {
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if ( desc->width[r][utf32&0x03FF] >= 0 ) { // already cached
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return double(desc->width[r][utf32 & 0x03FF]);
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}
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}
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}
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char buf4[4];
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int n = fl_utf8encode(utf32, buf4);
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double width = do_width_unscaled_(buf4, n);
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if (utf32 <= 0xFFFF) {
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desc->width[r][utf32 & 0x03FF] = (int)width;
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}
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return width;
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}
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double Fl_Xlib_Graphics_Driver::width_unscaled(const char* str, int n) {
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if (n == fl_utf8len(*str)) { // str contains a single unicode character
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int l;
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unsigned c = fl_utf8decode(str, str+n, &l);
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return width_unscaled(c); // that character's width may have been cached
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}
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return do_width_unscaled_(str, n); // full width computation for multi-char strings
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}
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double Fl_Xlib_Graphics_Driver::do_width_unscaled_(const char* str, int n) {
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if (!n) return 0;
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if (!fl_display || size_ == 0) return -1;
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if (!playout_) context();
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@ -1373,12 +1415,6 @@ int Fl_Xlib_Graphics_Driver::height_unscaled() {
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else return -1;
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}
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double Fl_Xlib_Graphics_Driver::width_unscaled(unsigned int c) {
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char buf4[4];
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int n = fl_utf8encode(c, buf4);
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return width_unscaled(buf4, n);
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}
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int Fl_Xlib_Graphics_Driver::descent_unscaled() {
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if (font_descriptor()) return ((Fl_Xlib_Font_Descriptor*)font_descriptor())->descent_;
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else return -1;
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@ -1458,6 +1494,7 @@ Fl_Xlib_Font_Descriptor::Fl_Xlib_Font_Descriptor(const char* name, Fl_Fontsize f
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angle = fangle;
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height_ = 0;
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descent_ = 0;
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width = NULL;
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}
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#endif // USE_PANGO
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