/usr/share/doc/libicu-devel/samples/layout
Edit: /usr/share/doc/libicu-devel/samples/layout/GDIFontInstance.cpp (9826B)
/*
*******************************************************************************
*
* © 2016 and later: Unicode, Inc. and others.
* License & terms of use: http://www.unicode.org/copyright.html#License
*
*******************************************************************************
*******************************************************************************
*
* Copyright (C) 1999-2008, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: GDIFontInstance.cpp
*
* created on: 08/09/2000
* created by: Eric R. Mader
*/
#include
#include "layout/LETypes.h"
#include "layout/LESwaps.h"
#include "layout/LEFontInstance.h"
#include "GDIFontInstance.h"
#include "sfnt.h"
#include "cmaps.h"
GDISurface::GDISurface(HDC theHDC)
: fHdc(theHDC), fCurrentFont(NULL)
{
// nothing else to do
}
GDISurface::~GDISurface()
{
// nothing to do
}
void GDISurface::setHDC(HDC theHDC)
{
fHdc = theHDC;
fCurrentFont = NULL;
}
void GDISurface::setFont(const GDIFontInstance *font)
{
#if 0
if (fCurrentFont != font) {
fCurrentFont = font;
SelectObject(fHdc, font->getFont());
}
#else
SelectObject(fHdc, font->getFont());
#endif
}
void GDISurface::drawGlyphs(const LEFontInstance *font, const LEGlyphID *glyphs, le_int32 count, const float *positions,
le_int32 x, le_int32 y, le_int32 width, le_int32 height)
{
TTGlyphID *ttGlyphs = LE_NEW_ARRAY(TTGlyphID, count);
le_int32 *dx = LE_NEW_ARRAY(le_int32, count);
float *ps = LE_NEW_ARRAY(float, count * 2 + 2);
le_int32 out = 0;
RECT clip;
clip.top = 0;
clip.left = 0;
clip.bottom = height;
clip.right = width;
for (le_int32 g = 0; g < count; g += 1) {
TTGlyphID ttGlyph = (TTGlyphID) LE_GET_GLYPH(glyphs[g]);
if (ttGlyph < 0xFFFE) {
ttGlyphs[out] = ttGlyph;
dx[out] = (le_int32) (positions[g * 2 + 2] - positions[g * 2]);
ps[out * 2] = positions[g * 2];
ps[out * 2 + 1] = positions[g * 2 + 1];
out += 1;
}
}
le_int32 dyStart, dyEnd;
setFont((GDIFontInstance *) font);
dyStart = dyEnd = 0;
while (dyEnd < out) {
float yOffset = ps[dyStart * 2 + 1];
float xOffset = ps[dyStart * 2];
while (dyEnd < out && yOffset == ps[dyEnd * 2 + 1]) {
dyEnd += 1;
}
ExtTextOut(fHdc, x + (le_int32) xOffset, y + (le_int32) yOffset - font->getAscent(), ETO_CLIPPED | ETO_GLYPH_INDEX, &clip,
(LPCWSTR) &ttGlyphs[dyStart], dyEnd - dyStart, (INT *) &dx[dyStart]);
dyStart = dyEnd;
}
LE_DELETE_ARRAY(ps);
LE_DELETE_ARRAY(dx);
LE_DELETE_ARRAY(ttGlyphs);
}
GDIFontInstance::GDIFontInstance(GDISurface *surface, TCHAR *faceName, le_int16 pointSize, LEErrorCode &status)
: FontTableCache(), fSurface(surface), fFont(NULL),
fPointSize(pointSize), fUnitsPerEM(0), fAscent(0), fDescent(0), fLeading(0),
fDeviceScaleX(1), fDeviceScaleY(1), fMapper(NULL)
{
LOGFONT lf;
FLOAT dpiX, dpiY;
POINT pt;
OUTLINETEXTMETRIC otm;
HDC hdc = surface->getHDC();
if (LE_FAILURE(status)) {
return;
}
SaveDC(hdc);
SetGraphicsMode(hdc, GM_ADVANCED);
ModifyWorldTransform(hdc, NULL, MWT_IDENTITY);
SetViewportOrgEx(hdc, 0, 0, NULL);
SetWindowOrgEx(hdc, 0, 0, NULL);
dpiX = (FLOAT) GetDeviceCaps(hdc, LOGPIXELSX);
dpiY = (FLOAT) GetDeviceCaps(hdc, LOGPIXELSY);
#if 1
pt.x = (int) (pointSize * dpiX / 72);
pt.y = (int) (pointSize * dpiY / 72);
DPtoLP(hdc, &pt, 1);
#else
pt.x = pt.y = pointSize;
#endif
lf.lfHeight = - pt.y;
lf.lfWidth = 0;
lf.lfEscapement = 0;
lf.lfOrientation = 0;
lf.lfWeight = 0;
lf.lfItalic = 0;
lf.lfUnderline = 0;
lf.lfStrikeOut = 0;
lf.lfCharSet = DEFAULT_CHARSET;
lf.lfOutPrecision = 0;
lf.lfClipPrecision = 0;
lf.lfQuality = 0;
lf.lfPitchAndFamily = 0;
lstrcpy(lf.lfFaceName, faceName);
fFont = CreateFontIndirect(&lf);
if (fFont == NULL) {
status = LE_FONT_FILE_NOT_FOUND_ERROR;
return;
}
SelectObject(hdc, fFont);
UINT ret = GetOutlineTextMetrics(hdc, sizeof otm, &otm);
if (ret == 0) {
status = LE_MISSING_FONT_TABLE_ERROR;
goto restore;
}
fUnitsPerEM = otm.otmEMSquare;
fAscent = otm.otmTextMetrics.tmAscent;
fDescent = otm.otmTextMetrics.tmDescent;
fLeading = otm.otmTextMetrics.tmExternalLeading;
status = initMapper();
if (LE_FAILURE(status)) {
goto restore;
}
#if 0
status = initFontTableCache();
#endif
restore:
RestoreDC(hdc, -1);
}
GDIFontInstance::GDIFontInstance(GDISurface *surface, const char *faceName, le_int16 pointSize, LEErrorCode &status)
: FontTableCache(), fSurface(surface), fFont(NULL),
fPointSize(pointSize), fUnitsPerEM(0), fAscent(0), fDescent(0), fLeading(0),
fDeviceScaleX(1), fDeviceScaleY(1), fMapper(NULL)
{
LOGFONTA lf;
FLOAT dpiX, dpiY;
POINT pt;
OUTLINETEXTMETRIC otm;
HDC hdc = surface->getHDC();
if (LE_FAILURE(status)) {
return;
}
SaveDC(hdc);
SetGraphicsMode(hdc, GM_ADVANCED);
ModifyWorldTransform(hdc, NULL, MWT_IDENTITY);
SetViewportOrgEx(hdc, 0, 0, NULL);
SetWindowOrgEx(hdc, 0, 0, NULL);
dpiX = (FLOAT) GetDeviceCaps(hdc, LOGPIXELSX);
dpiY = (FLOAT) GetDeviceCaps(hdc, LOGPIXELSY);
fDeviceScaleX = dpiX / 72;
fDeviceScaleY = dpiY / 72;
#if 1
pt.x = (int) (pointSize * fDeviceScaleX);
pt.y = (int) (pointSize * fDeviceScaleY);
DPtoLP(hdc, &pt, 1);
#else
pt.x = pt.y = pointSize;
#endif
lf.lfHeight = - pt.y;
lf.lfWidth = 0;
lf.lfEscapement = 0;
lf.lfOrientation = 0;
lf.lfWeight = 0;
lf.lfItalic = 0;
lf.lfUnderline = 0;
lf.lfStrikeOut = 0;
lf.lfCharSet = DEFAULT_CHARSET;
lf.lfOutPrecision = 0;
lf.lfClipPrecision = 0;
lf.lfQuality = 0;
lf.lfPitchAndFamily = 0;
strcpy(lf.lfFaceName, faceName);
fFont = CreateFontIndirectA(&lf);
if (fFont == NULL) {
status = LE_FONT_FILE_NOT_FOUND_ERROR;
return;
}
SelectObject(hdc, fFont);
UINT ret = GetOutlineTextMetrics(hdc, sizeof otm, &otm);
if (ret != 0) {
fUnitsPerEM = otm.otmEMSquare;
fAscent = otm.otmTextMetrics.tmAscent;
fDescent = otm.otmTextMetrics.tmDescent;
fLeading = otm.otmTextMetrics.tmExternalLeading;
} else {
const HEADTable *headTable = NULL;
const HHEATable *hheaTable = NULL;
// read unitsPerEm from 'head' table
headTable = (const HEADTable *) readFontTable(LE_HEAD_TABLE_TAG);
if (headTable == NULL) {
status = LE_MISSING_FONT_TABLE_ERROR;
goto restore;
}
fUnitsPerEM = SWAPW(headTable->unitsPerEm);
freeFontTable((const void *)headTable);
hheaTable = (HHEATable *) readFontTable(LE_HHEA_TABLE_TAG);
if (hheaTable == NULL) {
status = LE_MISSING_FONT_TABLE_ERROR;
goto restore;
}
fAscent = (le_int32) yUnitsToPoints((float) SWAPW(hheaTable->ascent));
fDescent = (le_int32) yUnitsToPoints((float) SWAPW(hheaTable->descent));
fLeading = (le_int32) yUnitsToPoints((float) SWAPW(hheaTable->lineGap));
freeFontTable((const void *) hheaTable);
}
status = initMapper();
if (LE_FAILURE(status)) {
goto restore;
}
#if 0
status = initFontTableCache();
#endif
restore:
RestoreDC(hdc, -1);
}
GDIFontInstance::~GDIFontInstance()
{
#if 0
flushFontTableCache();
delete[] fTableCache;
#endif
if (fFont != NULL) {
// FIXME: call RemoveObject first?
DeleteObject(fFont);
}
delete fMapper;
fMapper = NULL;
}
LEErrorCode GDIFontInstance::initMapper()
{
LETag cmapTag = LE_CMAP_TABLE_TAG;
const CMAPTable *cmap = (const CMAPTable *) readFontTable(cmapTag);
if (cmap == NULL) {
return LE_MISSING_FONT_TABLE_ERROR;
}
fMapper = CMAPMapper::createUnicodeMapper(cmap);
if (fMapper == NULL) {
return LE_MISSING_FONT_TABLE_ERROR;
}
return LE_NO_ERROR;
}
const void *GDIFontInstance::getFontTable(LETag tableTag) const
{
return FontTableCache::find(tableTag);
}
const void *GDIFontInstance::readFontTable(LETag tableTag) const
{
fSurface->setFont(this);
HDC hdc = fSurface->getHDC();
DWORD stag = SWAPL(tableTag);
DWORD len = GetFontData(hdc, stag, 0, NULL, 0);
void *result = NULL;
if (len != GDI_ERROR) {
result = LE_NEW_ARRAY(char, len);
GetFontData(hdc, stag, 0, result, len);
}
return result;
}
void GDIFontInstance::getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const
{
advance.fX = 0;
advance.fY = 0;
if (glyph == 0xFFFE || glyph == 0xFFFF) {
return;
}
GLYPHMETRICS metrics;
DWORD result;
MAT2 identity = {{0, 1}, {0, 0}, {0, 0}, {0, 1}};
HDC hdc = fSurface->getHDC();
fSurface->setFont(this);
result = GetGlyphOutline(hdc, glyph, GGO_GLYPH_INDEX | GGO_METRICS, &metrics, 0, NULL, &identity);
if (result == GDI_ERROR) {
return;
}
advance.fX = metrics.gmCellIncX;
return;
}
le_bool GDIFontInstance::getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &point) const
{
#if 0
hsFixedPoint2 pt;
le_bool result;
result = fFontInstance->getGlyphPoint(glyph, pointNumber, pt);
if (result) {
point.fX = xUnitsToPoints(pt.fX);
point.fY = yUnitsToPoints(pt.fY);
}
return result;
#else
return FALSE;
#endif
}