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Yet another attempt to fix text_extents function. 

Originally committed to SVN as r52.
This commit is contained in:
Niels Martin Hansen 2006-01-31 21:37:02 +00:00
parent eaa3fe1456
commit 979903d61a
1 changed files with 76 additions and 16 deletions
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92
core/automation.cpp
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@ -48,8 +48,9 @@
#include "string_codec.h"
#include "vfr.h"
#ifdef WIN32_MULDIV
#ifdef WIN32
#include <windows.h>
#include <wchar.h>
#else
#include <ft2build.h>
#include FT_FREETYPE_H
@ -292,18 +293,72 @@ namespace AutomationHelper {
double scale_x = L_gettableN(L, "scale_x");
double scale_y = L_gettableN(L, "scale_y");
int spacing = (int)L_gettableN(L, "spacing");
int charset = (int)L_gettableN(L, "encoding");
wxLogDebug(_T("text_extents for: %s:%f:%d%d%d%d:%f:%f:%d:%d"), fontname, fontsize, bold, italic, underline, strikeout, scale_x, scale_y, spacing, charset);
#ifdef WIN32
HDC thedc = CreateCompatibleDC(0);
if (!thedc) return 0;
SetMapMode(thedc, MM_TEXT);
fontsize = -MulDiv((int)(fontsize+0.5), GetDeviceCaps(thedc, LOGPIXELSY), 72);
LOGFONT lf;
ZeroMemory(&lf, sizeof(lf));
lf.lfHeight = fontsize;
lf.lfWeight = bold ? FW_BOLD : FW_NORMAL;
lf.lfItalic = italic;
lf.lfUnderline = underline;
lf.lfStrikeOut = strikeout;
lf.lfCharSet = charset;
lf.lfOutPrecision = OUT_TT_PRECIS;
lf.lfClipPrecision = CLIP_DEFAULT_PRECIS;
lf.lfQuality = ANTIALIASED_QUALITY;
lf.lfPitchAndFamily = DEFAULT_PITCH|FF_DONTCARE;
wcsncpy(lf.lfFaceName, fontname.wc_str(), 32);
HFONT thefont = CreateFontIndirect(&lf);
if (!thefont) return 0;
SelectObject(thedc, thefont);
SIZE sz;
if (spacing) {
resx = 0;
for (unsigned int i = 0; i < intext.length(); i++) {
wchar_t c = intext[i];
GetTextExtentPoint32(thedc, &c, 1, &sz);
resx += sz.cx + spacing;
resy = sz.cy;
}
} else {
GetTextExtentPoint32(thedc, intext.wc_str(), intext.Length(), &sz);
resx = sz.cx;
resy = sz.cy;
}
// HACKISH FIX! This seems to work, but why? It shouldn't be needed?!?
fontsize = L_gettableN(L, "fontsize");
resx = (int)(resx * fontsize/resy + 0.5);
resy = (int)(fontsize + 0.5);
TEXTMETRIC tm;
GetTextMetrics(thedc, &tm);
resd = tm.tmDescent;
resl = tm.tmExternalLeading;
DeleteObject(thedc);
DeleteObject(thefont);
#else // not WIN32
wxMemoryDC thedc;
// fix fontsize to be 72 DPI
#ifdef WIN32_MULDIV
fontsize = -MulDiv((int)(fontsize+0.5), 72, thedc.GetPPI().y);
#else
fontsize = -FT_MulDiv((int)(fontsize+0.5), 72, thedc.GetPPI().y);
#endif
// now try to get a font!
// use the font list to get some caching... (chance is the script will need the same font very often)
// USING wxTheFontList SEEMS TO CAUSE BAD LEAKS!
//wxFont *thefont = wxTheFontList->FindOrCreateFont(
wxFont thefont(
fontsize,
@ -315,19 +370,24 @@ namespace AutomationHelper {
wxFONTENCODING_SYSTEM);
thedc.SetFont(thefont);
thedc.GetTextExtent(intext, &resx, &resy, &resd, &resl);
// alternative: calculate per-character sizing. this might be more consistent for fonts with kerning information.
/* for (unsigned int i = 0; i < intext.length(); i++) {
int a, b, c, d;
thedc.GetTextExtent(intext[i], &a, &b, &c, &d);
resx += a;
resy = b > resy ? b : resy;
resd = c > resd ? c : resd;
resl = d > resl ? d : resl;
if (spacing) {
// If there's inter-character spacing, kerning info must not be used, so calculate width per character
for (unsigned int i = 0; i < intext.length(); i++) {
int a, b, c, d;
thedc.GetTextExtent(intext[i], &a, &b, &c, &d);
resx += a + spacing;
resy = b > resy ? b : resy;
resd = c > resd ? c : resd;
resl = d > resl ? d : resl;
}
} else {
// If the inter-character spacing should be zero, kerning info can (and must) be used, so calculate everything in one go
thedc.GetTextExtent(intext, &resx, &resy, &resd, &resl);
}
*/
#endif
resx = (int)(scale_x / 100 * (intext.length() * spacing + resx) + 0.5);
// Compensate for scaling
resx = (int)(scale_x / 100 * resx + 0.5);
resy = (int)(scale_y / 100 * resy + 0.5);
resd = (int)(scale_y / 100 * resd + 0.5);
resl = (int)(scale_y / 100 * resl + 0.5);