Remove ALL font fallback logic from Skia.

src/pdf/SkPDFDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPDFDevice.h"
 
 #include "SkAnnotation.h"
@@ skipping 17 matching lines @@
 #include "SkPDFUtils.h"
 #include "SkRect.h"
 #include "SkRRect.h"
 #include "SkString.h"
 #include "SkSurface.h"
 #include "SkTextFormatParams.h"
 #include "SkTemplates.h"
 #include "SkTypefacePriv.h"
 #include "SkTSet.h"
 
-#ifdef SK_BUILD_FOR_ANDROID
-#include "SkTypeface_android.h"
-
-struct TypefaceFallbackData {
-    SkTypeface* typeface;
-    int lowerBounds;
-    int upperBounds;
-
-    bool operator==(const TypefaceFallbackData& b) const {
-        return typeface == b.typeface &&
-               lowerBounds == b.lowerBounds &&
-               upperBounds == b.upperBounds;
-    }
-};
-#endif
-
 #define DPI_FOR_RASTER_SCALE_ONE 72
 
 // Utility functions
 
 static void emit_pdf_color(SkColor color, SkWStream* result) {
     SkASSERT(SkColorGetA(color) == 0xFF);  // We handle alpha elsewhere.
     SkScalar colorMax = SkIntToScalar(0xFF);
     SkPDFScalar::Append(
             SkScalarDiv(SkIntToScalar(SkColorGetR(color)), colorMax), result);
     result->writeText(" ");
@@ skipping 1104 matching lines @@
         // making text unreadable (e.g. same text twice when using CSS shadows).
         return;
     }
     SkASSERT(1 == scalarsPerPos || 2 == scalarsPerPos);
     SkPaint textPaint = calculate_text_paint(paint);
     ScopedContentEntry content(this, d, textPaint, true);
     if (!content.entry()) {
         return;
     }
 
-#ifdef SK_BUILD_FOR_ANDROID
-    /*
-     * In the case that we have enabled fallback fonts on Android we need to
-     * take the following steps to ensure that the PDF draws all characters,
-     * regardless of their underlying font file, correctly.
-     *
-     * 1. Convert input into GlyphID encoding if it currently is not
-     * 2. Iterate over the glyphIDs and identify the actual typeface that each
-     *    glyph resolves to
-     * 3. Iterate over those typefaces and recursively call this function with
-     *    only the glyphs (and their positions) that the typeface is capable of
-     *    resolving.
-     */
-    if (paint.getPaintOptionsAndroid().isUsingFontFallbacks()) {
-        uint16_t* glyphIDs = NULL;
-        SkGlyphStorage tmpStorage(0);
-        size_t numGlyphs = 0;
-
-        // convert to glyphIDs
-        if (paint.getTextEncoding() == SkPaint::kGlyphID_TextEncoding) {
-            numGlyphs = len / 2;
-            glyphIDs = reinterpret_cast<uint16_t*>(const_cast<void*>(text));
-        } else {
-            numGlyphs = paint.textToGlyphs(text, len, NULL);
-            tmpStorage.reset(numGlyphs);
-            paint.textToGlyphs(text, len, tmpStorage.get());
-            glyphIDs = tmpStorage.get();
-        }
-
-        // if no typeface is provided in the paint get the default
-        SkAutoTUnref<SkTypeface> origFace(SkSafeRef(paint.getTypeface()));
-        if (NULL == origFace.get()) {
-            origFace.reset(SkTypeface::RefDefault());
-        }
-        const uint16_t origGlyphCount = origFace->countGlyphs();
-
-        // keep a list of the already visited typefaces and some data about them
-        SkTDArray<TypefaceFallbackData> visitedTypefaces;
-
-        // find all the typefaces needed to resolve this run of text
-        bool usesOriginalTypeface = false;
-        for (uint16_t x = 0; x < numGlyphs; ++x) {
-            // optimization that checks to see if original typeface can resolve
-            // the glyph
-            if (glyphIDs[x] < origGlyphCount) {
-                usesOriginalTypeface = true;
-                continue;
-            }
-
-            // find the fallback typeface that supports this glyph
-            TypefaceFallbackData data;
-            data.typeface =
-                    SkGetTypefaceForGlyphID(glyphIDs[x], origFace.get(),
-                                            paint.getPaintOptionsAndroid(),
-                                            &data.lowerBounds,
-                                            &data.upperBounds);
-            // add the typeface and its data if we don't have it
-            if (data.typeface && !visitedTypefaces.contains(data)) {
-                visitedTypefaces.push(data);
-            }
-        }
-
-        // if the original font was used then add it to the list as well
-        if (usesOriginalTypeface) {
-            TypefaceFallbackData* data = visitedTypefaces.push();
-            data->typeface = origFace.get();
-            data->lowerBounds = 0;
-            data->upperBounds = origGlyphCount;
-        }
-
-        // keep a scratch glyph and pos storage
-        SkAutoTMalloc<SkScalar> posStorage(len * scalarsPerPos);
-        SkScalar* tmpPos = posStorage.get();
-        SkGlyphStorage glyphStorage(numGlyphs);
-        uint16_t* tmpGlyphIDs = glyphStorage.get();
-
-        // loop through all the valid typefaces, trim the glyphs to only those
-        // resolved by the typeface, and then draw that run of glyphs
-        for (int x = 0; x < visitedTypefaces.count(); ++x) {
-            const TypefaceFallbackData& data = visitedTypefaces[x];
-
-            int tmpGlyphCount = 0;
-            for (uint16_t y = 0; y < numGlyphs; ++y) {
-                if (glyphIDs[y] >= data.lowerBounds &&
-                        glyphIDs[y] < data.upperBounds) {
-                    tmpGlyphIDs[tmpGlyphCount] = glyphIDs[y] - data.lowerBounds;
-                    memcpy(&(tmpPos[tmpGlyphCount * scalarsPerPos]),
-                           &(pos[y * scalarsPerPos]),
-                           scalarsPerPos * sizeof(SkScalar));
-                    tmpGlyphCount++;
-                }
-            }
-
-            // recursively call this function with the right typeface
-            SkPaint tmpPaint = paint;
-            tmpPaint.setTypeface(data.typeface);
-            tmpPaint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
-
-            // turn off fallback chaining
-            SkPaintOptionsAndroid paintOpts = tmpPaint.getPaintOptionsAndroid();
-            paintOpts.setUseFontFallbacks(false);
-            tmpPaint.setPaintOptionsAndroid(paintOpts);
-
-            this->drawPosText(d, tmpGlyphIDs, tmpGlyphCount * 2, tmpPos, constY,
-                              scalarsPerPos, tmpPaint);
-        }
-        return;
-    }
-#endif
-
     SkGlyphStorage storage(0);
     uint16_t* glyphIDs = NULL;
     size_t numGlyphs = force_glyph_encoding(paint, text, len, &storage,
                                             &glyphIDs);
     textPaint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
 
     SkDrawCacheProc glyphCacheProc = textPaint.getDrawCacheProc();
     content.entry()->fContent.writeText("BT\n");
     updateFont(textPaint, glyphIDs[0], content.entry());
     for (size_t i = 0; i < numGlyphs; i++) {
@@ skipping 1013 matching lines @@
     SkAutoTUnref<SkPDFImage> image(
         SkPDFImage::CreateImage(*bitmap, subset, fEncoder));
     if (!image) {
         return;
     }
 
     SkPDFUtils::DrawFormXObject(this->addXObjectResource(image.get()),
                                 &content.entry()->fContent);
 }