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Diffstat (limited to 'WebCore/platform/graphics/skia/SkiaFontWin.cpp')
| -rw-r--r-- | WebCore/platform/graphics/skia/SkiaFontWin.cpp | 358 |
1 files changed, 0 insertions, 358 deletions
diff --git a/WebCore/platform/graphics/skia/SkiaFontWin.cpp b/WebCore/platform/graphics/skia/SkiaFontWin.cpp deleted file mode 100644 index 5046c50..0000000 --- a/WebCore/platform/graphics/skia/SkiaFontWin.cpp +++ /dev/null @@ -1,358 +0,0 @@ -/* - * Copyright (c) 2008, Google Inc. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are - * met: - * - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * Redistributions in binary form must reproduce the above - * copyright notice, this list of conditions and the following disclaimer - * in the documentation and/or other materials provided with the - * distribution. - * * Neither the name of Google Inc. nor the names of its - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#include "config.h" -#include "SkiaFontWin.h" - -#include "AffineTransform.h" -#include "PlatformContextSkia.h" -#include "Gradient.h" -#include "Pattern.h" -#include "SkCanvas.h" -#include "SkPaint.h" -#include "SkShader.h" - -#include <wtf/ListHashSet.h> -#include <wtf/Vector.h> - -namespace WebCore { - -struct CachedOutlineKey { - CachedOutlineKey() : font(0), glyph(0), path(0) {} - CachedOutlineKey(HFONT f, WORD g) : font(f), glyph(g), path(0) {} - - HFONT font; - WORD glyph; - - // The lifetime of this pointer is managed externally to this class. Be sure - // to call DeleteOutline to remove items. - SkPath* path; -}; - -const bool operator==(const CachedOutlineKey& a, const CachedOutlineKey& b) -{ - return a.font == b.font && a.glyph == b.glyph; -} - -struct CachedOutlineKeyHash { - static unsigned hash(const CachedOutlineKey& key) - { - unsigned keyBytes; - memcpy(&keyBytes, &key.font, sizeof(unsigned)); - return keyBytes + key.glyph; - } - - static unsigned equal(const CachedOutlineKey& a, const CachedOutlineKey& b) - { - return a.font == b.font && a.glyph == b.glyph; - } - - static const bool safeToCompareToEmptyOrDeleted = true; -}; - -// The global number of glyph outlines we'll cache. -static const int outlineCacheSize = 256; - -typedef ListHashSet<CachedOutlineKey, outlineCacheSize+1, CachedOutlineKeyHash> OutlineCache; - -// FIXME: Convert from static constructor to accessor function. WebCore tries to -// avoid global constructors to save on start-up time. -static OutlineCache outlineCache; - -static SkScalar FIXEDToSkScalar(FIXED fixed) -{ - SkFixed skFixed; - memcpy(&skFixed, &fixed, sizeof(SkFixed)); - return SkFixedToScalar(skFixed); -} - -// Removes the given key from the cached outlines, also deleting the path. -static void deleteOutline(OutlineCache::iterator deleteMe) -{ - delete deleteMe->path; - outlineCache.remove(deleteMe); -} - -static void addPolyCurveToPath(const TTPOLYCURVE* polyCurve, SkPath* path) -{ - switch (polyCurve->wType) { - case TT_PRIM_LINE: - for (WORD i = 0; i < polyCurve->cpfx; i++) { - path->lineTo(FIXEDToSkScalar(polyCurve->apfx[i].x), -FIXEDToSkScalar(polyCurve->apfx[i].y)); - } - break; - - case TT_PRIM_QSPLINE: - // FIXME: doesn't this duplicate points if we do the loop > once? - for (WORD i = 0; i < polyCurve->cpfx - 1; i++) { - SkScalar bx = FIXEDToSkScalar(polyCurve->apfx[i].x); - SkScalar by = FIXEDToSkScalar(polyCurve->apfx[i].y); - - SkScalar cx = FIXEDToSkScalar(polyCurve->apfx[i + 1].x); - SkScalar cy = FIXEDToSkScalar(polyCurve->apfx[i + 1].y); - if (i < polyCurve->cpfx - 2) { - // We're not the last point, compute C. - cx = SkScalarAve(bx, cx); - cy = SkScalarAve(by, cy); - } - - // Need to flip the y coordinates since the font's coordinate system is - // flipped from ours vertically. - path->quadTo(bx, -by, cx, -cy); - } - break; - - case TT_PRIM_CSPLINE: - // FIXME - break; - } -} - -// The size of the glyph path buffer. -static const int glyphPathBufferSize = 4096; - -// Fills the given SkPath with the outline for the given glyph index. The font -// currently selected into the given DC is used. Returns true on success. -static bool getPathForGlyph(HDC dc, WORD glyph, SkPath* path) -{ - char buffer[glyphPathBufferSize]; - GLYPHMETRICS gm; - MAT2 mat = {{0, 1}, {0, 0}, {0, 0}, {0, 1}}; // Each one is (fract,value). - - DWORD totalSize = GetGlyphOutlineW(dc, glyph, GGO_GLYPH_INDEX | GGO_NATIVE, - &gm, glyphPathBufferSize, buffer, &mat); - if (totalSize == GDI_ERROR) - return false; - - const char* curGlyph = buffer; - const char* endGlyph = &buffer[totalSize]; - while (curGlyph < endGlyph) { - const TTPOLYGONHEADER* polyHeader = - reinterpret_cast<const TTPOLYGONHEADER*>(curGlyph); - path->moveTo(FIXEDToSkScalar(polyHeader->pfxStart.x), - -FIXEDToSkScalar(polyHeader->pfxStart.y)); - - const char* curPoly = curGlyph + sizeof(TTPOLYGONHEADER); - const char* endPoly = curGlyph + polyHeader->cb; - while (curPoly < endPoly) { - const TTPOLYCURVE* polyCurve = - reinterpret_cast<const TTPOLYCURVE*>(curPoly); - addPolyCurveToPath(polyCurve, path); - curPoly += sizeof(WORD) * 2 + sizeof(POINTFX) * polyCurve->cpfx; - } - path->close(); - curGlyph += polyHeader->cb; - } - - return true; -} - -// Returns a SkPath corresponding to the give glyph in the given font. The font -// should be selected into the given DC. The returned path is owned by the -// hashtable. Returns 0 on error. -const SkPath* SkiaWinOutlineCache::lookupOrCreatePathForGlyph(HDC hdc, HFONT font, WORD glyph) -{ - CachedOutlineKey key(font, glyph); - OutlineCache::iterator found = outlineCache.find(key); - if (found != outlineCache.end()) { - // Keep in MRU order by removing & reinserting the value. - key = *found; - outlineCache.remove(found); - outlineCache.add(key); - return key.path; - } - - key.path = new SkPath; - if (!getPathForGlyph(hdc, glyph, key.path)) - return 0; - - if (outlineCache.size() > outlineCacheSize) - // The cache is too big, find the oldest value (first in the list). - deleteOutline(outlineCache.begin()); - - outlineCache.add(key); - return key.path; -} - - -void SkiaWinOutlineCache::removePathsForFont(HFONT hfont) -{ - // ListHashSet isn't the greatest structure for deleting stuff out of, but - // removing entries will be relatively rare (we don't remove fonts much, nor - // do we draw out own glyphs using these routines much either). - // - // We keep a list of all glyphs we're removing which we do in a separate - // pass. - Vector<CachedOutlineKey> outlinesToDelete; - for (OutlineCache::iterator i = outlineCache.begin(); - i != outlineCache.end(); ++i) - outlinesToDelete.append(*i); - - for (Vector<CachedOutlineKey>::iterator i = outlinesToDelete.begin(); - i != outlinesToDelete.end(); ++i) - deleteOutline(outlineCache.find(*i)); -} - -bool windowsCanHandleDrawTextShadow(GraphicsContext *context) -{ - FloatSize shadowOffset; - float shadowBlur; - Color shadowColor; - ColorSpace shadowColorSpace; - - bool hasShadow = context->getShadow(shadowOffset, shadowBlur, shadowColor, shadowColorSpace); - return (hasShadow && (shadowBlur == 0) && (shadowColor.alpha() == 255) && (context->fillColor().alpha() == 255)); -} - -bool windowsCanHandleTextDrawing(GraphicsContext* context) -{ - // Check for non-translation transforms. Sometimes zooms will look better in - // Skia, and sometimes better in Windows. The main problem is that zooming - // in using Skia will show you the hinted outlines for the smaller size, - // which look weird. All else being equal, it's better to use Windows' text - // drawing, so we don't check for zooms. - const AffineTransform& matrix = context->getCTM(); - if (matrix.b() != 0 || matrix.c() != 0) // Check for skew. - return false; - - // Check for stroke effects. - if (context->platformContext()->getTextDrawingMode() != TextModeFill) - return false; - - // Check for gradients. - if (context->fillGradient() || context->strokeGradient()) - return false; - - // Check for patterns. - if (context->fillPattern() || context->strokePattern()) - return false; - - // Check for shadow effects. - if (context->platformContext()->getDrawLooper() && (!windowsCanHandleDrawTextShadow(context))) - return false; - - return true; -} - -// Draws the given text string using skia. Note that gradient or -// pattern may be NULL, in which case a solid colour is used. -static bool skiaDrawText(HFONT hfont, - HDC dc, - SkCanvas* canvas, - const SkPoint& point, - SkPaint* paint, - const WORD* glyphs, - const int* advances, - const GOFFSET* offsets, - int numGlyphs) -{ - float x = point.fX, y = point.fY; - - for (int i = 0; i < numGlyphs; i++) { - const SkPath* path = SkiaWinOutlineCache::lookupOrCreatePathForGlyph(dc, hfont, glyphs[i]); - if (!path) - return false; - - float offsetX = 0.0f, offsetY = 0.0f; - if (offsets && (offsets[i].du != 0 || offsets[i].dv != 0)) { - offsetX = offsets[i].du; - offsetY = offsets[i].dv; - } - - SkPath newPath; - newPath.addPath(*path, x + offsetX, y + offsetY); - canvas->drawPath(newPath, *paint); - - x += advances[i]; - } - - return true; -} - -bool paintSkiaText(GraphicsContext* context, - HFONT hfont, - int numGlyphs, - const WORD* glyphs, - const int* advances, - const GOFFSET* offsets, - const SkPoint* origin) -{ - HDC dc = GetDC(0); - HGDIOBJ oldFont = SelectObject(dc, hfont); - - PlatformContextSkia* platformContext = context->platformContext(); - TextDrawingModeFlags textMode = platformContext->getTextDrawingMode(); - - // Filling (if necessary). This is the common case. - SkPaint paint; - platformContext->setupPaintForFilling(&paint); - paint.setFlags(SkPaint::kAntiAlias_Flag); - bool didFill = false; - - if ((textMode & TextModeFill) && SkColorGetA(paint.getColor())) { - if (!skiaDrawText(hfont, dc, platformContext->canvas(), *origin, &paint, - &glyphs[0], &advances[0], &offsets[0], numGlyphs)) - return false; - didFill = true; - } - - // Stroking on top (if necessary). - if ((textMode & TextModeStroke) - && platformContext->getStrokeStyle() != NoStroke - && platformContext->getStrokeThickness() > 0) { - - paint.reset(); - platformContext->setupPaintForStroking(&paint, 0, 0); - paint.setFlags(SkPaint::kAntiAlias_Flag); - if (didFill) { - // If there is a shadow and we filled above, there will already be - // a shadow. We don't want to draw it again or it will be too dark - // and it will go on top of the fill. - // - // Note that this isn't strictly correct, since the stroke could be - // very thick and the shadow wouldn't account for this. The "right" - // thing would be to draw to a new layer and then draw that layer - // with a shadow. But this is a lot of extra work for something - // that isn't normally an issue. - SkSafeUnref(paint.setLooper(0)); - } - - if (!skiaDrawText(hfont, dc, platformContext->canvas(), *origin, &paint, - &glyphs[0], &advances[0], &offsets[0], numGlyphs)) - return false; - } - - SelectObject(dc, oldFont); - ReleaseDC(0, dc); - - return true; -} - -} // namespace WebCore |