Move all text stuff to its own folder

src/gpu/GrFontScaler.cpp

-
-/*
- * Copyright 2010 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "GrFontScaler.h"
-#include "SkDescriptor.h"
-#include "SkDistanceFieldGen.h"
-#include "SkGlyphCache.h"
-
-///////////////////////////////////////////////////////////////////////////////
-
-GrFontScaler::GrFontScaler(SkGlyphCache* strike) {
-    fStrike = strike;
-    fKey = nullptr;
-}
-
-GrFontScaler::~GrFontScaler() {
-    SkSafeUnref(fKey);
-}
-
-GrMaskFormat GrFontScaler::getMaskFormat() const {
-    SkMask::Format format = fStrike->getMaskFormat();
-    switch (format) {
-        case SkMask::kBW_Format:
-            // fall through to kA8 -- we store BW glyphs in our 8-bit cache
-        case SkMask::kA8_Format:
-            return kA8_GrMaskFormat;
-        case SkMask::kLCD16_Format:
-            return kA565_GrMaskFormat;
-        case SkMask::kARGB32_Format:
-            return kARGB_GrMaskFormat;
-        default:
-            SkDEBUGFAIL("unsupported SkMask::Format");
-            return kA8_GrMaskFormat;
-    }
-}
-
-const GrFontDescKey* GrFontScaler::getKey() {
-    if (nullptr == fKey) {
-        fKey = new GrFontDescKey(fStrike->getDescriptor());
-    }
-    return fKey;
-}
-
-GrMaskFormat GrFontScaler::getPackedGlyphMaskFormat(const SkGlyph& glyph) const {
-    SkMask::Format format = static_cast<SkMask::Format>(glyph.fMaskFormat);
-    switch (format) {
-        case SkMask::kBW_Format:
-            // fall through to kA8 -- we store BW glyphs in our 8-bit cache
-        case SkMask::kA8_Format:
-            return kA8_GrMaskFormat;
-        case SkMask::kLCD16_Format:
-            return kA565_GrMaskFormat;
-        case SkMask::kARGB32_Format:
-            return kARGB_GrMaskFormat;
-        default:
-            SkDEBUGFAIL("unsupported SkMask::Format");
-            return kA8_GrMaskFormat;
-    }
-}
-
-bool GrFontScaler::getPackedGlyphBounds(const SkGlyph& glyph, SkIRect* bounds) {
-#if 1
-    // crbug:510931
-    // Retrieving the image from the cache can actually change the mask format.
-    fStrike->findImage(glyph);
-#endif
-    bounds->setXYWH(glyph.fLeft, glyph.fTop, glyph.fWidth, glyph.fHeight);
-
-    return true;
-}
-
-bool GrFontScaler::getPackedGlyphDFBounds(const SkGlyph& glyph, SkIRect* bounds) {
-#if 1
-    // crbug:510931
-    // Retrieving the image from the cache can actually change the mask format.
-    fStrike->findImage(glyph);
-#endif
-    bounds->setXYWH(glyph.fLeft, glyph.fTop, glyph.fWidth, glyph.fHeight);
-    bounds->outset(SK_DistanceFieldPad, SK_DistanceFieldPad);
-
-    return true;
-}
-
-namespace {
-// expands each bit in a bitmask to 0 or ~0 of type INT_TYPE. Used to expand a BW glyph mask to
-// A8, RGB565, or RGBA8888.
-template <typename INT_TYPE>
-void expand_bits(INT_TYPE* dst,
-                 const uint8_t* src,
-                 int width,
-                 int height,
-                 int dstRowBytes,
-                 int srcRowBytes) {
-    for (int i = 0; i < height; ++i) {
-        int rowWritesLeft = width;
-        const uint8_t* s = src;
-        INT_TYPE* d = dst;
-        while (rowWritesLeft > 0) {
-            unsigned mask = *s++;
-            for (int i = 7; i >= 0 && rowWritesLeft; --i, --rowWritesLeft) {
-                *d++ = (mask & (1 << i)) ? (INT_TYPE)(~0UL) : 0;
-            }
-        }
-        dst = reinterpret_cast<INT_TYPE*>(reinterpret_cast<intptr_t>(dst) + dstRowBytes);
-        src += srcRowBytes;
-    }
-}
-}
-
-bool GrFontScaler::getPackedGlyphImage(const SkGlyph& glyph, int width, int height, int dstRB,
-                                       GrMaskFormat expectedMaskFormat, void* dst) {
-    SkASSERT(glyph.fWidth == width);
-    SkASSERT(glyph.fHeight == height);
-    const void* src = fStrike->findImage(glyph);
-    if (nullptr == src) {
-        return false;
-    }
-
-    // crbug:510931
-    // Retrieving the image from the cache can actually change the mask format.  This case is very
-    // uncommon so for now we just draw a clear box for these glyphs.
-    if (getPackedGlyphMaskFormat(glyph) != expectedMaskFormat) {
-        const int bpp = GrMaskFormatBytesPerPixel(expectedMaskFormat);
-        for (int y = 0; y < height; y++) {
-            sk_bzero(dst, width * bpp);
-            dst = (char*)dst + dstRB;
-        }
-        return true;
-    }
-
-    int srcRB = glyph.rowBytes();
-    // The windows font host sometimes has BW glyphs in a non-BW strike. So it is important here to
-    // check the glyph's format, not the strike's format, and to be able to convert to any of the
-    // GrMaskFormats.
-    if (SkMask::kBW_Format == glyph.fMaskFormat) {
-        // expand bits to our mask type
-        const uint8_t* bits = reinterpret_cast<const uint8_t*>(src);
-        switch (expectedMaskFormat) {
-            case kA8_GrMaskFormat:{
-                uint8_t* bytes = reinterpret_cast<uint8_t*>(dst);
-                expand_bits(bytes, bits, width, height, dstRB, srcRB);
-                break;
-            }
-            case kA565_GrMaskFormat: {
-                uint16_t* rgb565 = reinterpret_cast<uint16_t*>(dst);
-                expand_bits(rgb565, bits, width, height, dstRB, srcRB);
-                break;
-            }
-            default:
-                SkFAIL("Invalid GrMaskFormat");
-        }
-    } else if (srcRB == dstRB) {
-        memcpy(dst, src, dstRB * height);
-    } else {
-        const int bbp = GrMaskFormatBytesPerPixel(expectedMaskFormat);
-        for (int y = 0; y < height; y++) {
-            memcpy(dst, src, width * bbp);
-            src = (const char*)src + srcRB;
-            dst = (char*)dst + dstRB;
-        }
-    }
-    return true;
-}
-
-bool GrFontScaler::getPackedGlyphDFImage(const SkGlyph& glyph, int width, int height, void* dst) {
-    SkASSERT(glyph.fWidth + 2*SK_DistanceFieldPad == width);
-    SkASSERT(glyph.fHeight + 2*SK_DistanceFieldPad == height);
-    const void* image = fStrike->findImage(glyph);
-    if (nullptr == image) {
-        return false;
-    }
-    // now generate the distance field
-    SkASSERT(dst);
-    SkMask::Format maskFormat = static_cast<SkMask::Format>(glyph.fMaskFormat);
-    if (SkMask::kA8_Format == maskFormat) {
-        // make the distance field from the image
-        SkGenerateDistanceFieldFromA8Image((unsigned char*)dst,
-                                           (unsigned char*)image,
-                                           glyph.fWidth, glyph.fHeight,
-                                           glyph.rowBytes());
-    } else if (SkMask::kBW_Format == maskFormat) {
-        // make the distance field from the image
-        SkGenerateDistanceFieldFromBWImage((unsigned char*)dst,
-                                           (unsigned char*)image,
-                                           glyph.fWidth, glyph.fHeight,
-                                           glyph.rowBytes());
-    } else {
-        return false;
-    }
-
-    return true;
-}
-
-const SkPath* GrFontScaler::getGlyphPath(const SkGlyph& glyph) {
-    return fStrike->findPath(glyph);
-}
-
-const SkGlyph& GrFontScaler::grToSkGlyph(GrGlyph::PackedID id) {
-    return fStrike->getGlyphIDMetrics(GrGlyph::UnpackID(id),
-                                      GrGlyph::UnpackFixedX(id),
-                                      GrGlyph::UnpackFixedY(id));
-}