Пример #1
0
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 (NULL == 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;
}
Пример #2
0
static bool get_packed_glyph_df_image(SkGlyphCache* cache, const SkGlyph& glyph,
                                      int width, int height, void* dst) {
    SkASSERT(glyph.fWidth + 2*SK_DistanceFieldPad == width);
    SkASSERT(glyph.fHeight + 2*SK_DistanceFieldPad == height);

#ifndef SK_USE_LEGACY_DISTANCE_FIELDS
    const SkPath* path = cache->findPath(glyph);
    if (nullptr == path) {
        return false;
    }

    SkDEBUGCODE(SkRect glyphBounds = SkRect::MakeXYWH(glyph.fLeft,
                                                      glyph.fTop,
                                                      glyph.fWidth,
                                                      glyph.fHeight));
    SkASSERT(glyphBounds.contains(path->getBounds()));

    // now generate the distance field
    SkASSERT(dst);
    SkMatrix drawMatrix;
    drawMatrix.setTranslate((SkScalar)-glyph.fLeft, (SkScalar)-glyph.fTop);

    // Generate signed distance field directly from SkPath
    bool succeed = GrGenerateDistanceFieldFromPath((unsigned char*)dst,
                                           *path, drawMatrix,
                                           width, height, width * sizeof(unsigned char));

    if (!succeed) {
#endif
        const void* image = cache->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;
        }
#ifndef SK_USE_LEGACY_DISTANCE_FIELDS
    }
#endif
    return true;
}
Пример #3
0
void SkScalerContext_CairoFT::generateImage(const SkGlyph& glyph)
{
    SkASSERT(fScaledFont != nullptr);
    CairoLockedFTFace faceLock(fScaledFont);
    FT_Face face = faceLock.getFace();

    FT_Error err = FT_Load_Glyph(face, glyph.getGlyphID(), fLoadGlyphFlags);

    if (err != 0) {
        memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight);
        return;
    }

    prepareGlyph(face->glyph);

    bool useLcdFilter =
        face->glyph->format == FT_GLYPH_FORMAT_OUTLINE &&
        isLCD(glyph) &&
        gSetLcdFilter;
    if (useLcdFilter) {
        gSetLcdFilter(face->glyph->library, fLcdFilter);
    }

    generateGlyphImage(face, glyph);

    if (useLcdFilter) {
        gSetLcdFilter(face->glyph->library, FT_LCD_FILTER_NONE);
    }
}
Пример #4
0
static bool get_packed_glyph_image(SkGlyphCache* cache, const SkGlyph& glyph, int width,
                                   int height, int dstRB, GrMaskFormat expectedMaskFormat,
                                   void* dst) {
    SkASSERT(glyph.fWidth == width);
    SkASSERT(glyph.fHeight == height);
    const void* src = cache->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 (get_packed_glyph_mask_format(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;
}
Пример #5
0
void SkScalerContext_CairoFT::generateImage(const SkGlyph& glyph)
{
    SkASSERT(fScaledFont != NULL);
    CairoLockedFTFace faceLock(fScaledFont);
    FT_Face face = faceLock.getFace();

    FT_Error err = FT_Load_Glyph(face, glyph.getGlyphID(), fLoadGlyphFlags);

    if (err != 0) {
        memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight);
        return;
    }

    generateGlyphImage(face, glyph);
}
void SkRandomScalerContext::generateImage(const SkGlyph& glyph) {
    SkMask::Format format = (SkMask::Format)glyph.fMaskFormat;
    switch (glyph.getGlyphID() % 4) {
        case 0:
            format = SkMask::kLCD16_Format;
            break;
        case 1:
            format = SkMask::kA8_Format;
            break;
        case 2:
            format = SkMask::kARGB32_Format;
            break;
        case 3:
            format = SkMask::kBW_Format;
            break;
    }
    const_cast<SkGlyph&>(glyph).fMaskFormat = format;

    // if the format is ARGB, we just draw the glyph from path ourselves.  Otherwise, we force
    // our proxy context to generate the image from paths.
    if (!fFakeIt) {
        if (SkMask::kARGB32_Format == glyph.fMaskFormat) {
            SkPath path;
            fProxy->getPath(glyph, &path);

            SkBitmap bm;
            bm.installPixels(SkImageInfo::MakeN32Premul(glyph.fWidth, glyph.fHeight),
                             glyph.fImage, glyph.rowBytes());
            bm.eraseColor(0);

            SkCanvas canvas(bm);
            canvas.translate(-SkIntToScalar(glyph.fLeft),
                             -SkIntToScalar(glyph.fTop));
            canvas.drawPath(path, fFace->paint());
        } else {
            fProxy->forceGenerateImageFromPath();
            fProxy->getImage(glyph);
            fProxy->forceOffGenerateImageFromPath();
        }
    } else {
        sk_bzero(glyph.fImage, glyph.computeImageSize());
    }
}
Пример #7
0
void SkGScalerContext::generateImage(const SkGlyph& glyph) {
    if (SkMask::kARGB32_Format == glyph.fMaskFormat) {
        SkPath path;
        fProxy->getPath(glyph, &path);

        SkBitmap bm;
        bm.installPixels(SkImageInfo::MakeN32Premul(glyph.fWidth, glyph.fHeight),
                         glyph.fImage, glyph.rowBytes());
        bm.eraseColor(0);

        SkCanvas canvas(bm);
        canvas.translate(-SkIntToScalar(glyph.fLeft),
                         -SkIntToScalar(glyph.fTop));
        canvas.concat(fMatrix);
        canvas.drawPath(path, fFace->paint());
    } else {
        fProxy->getImage(glyph);
    }
}
Пример #8
0
void RandomScalerContext::generateImage(const SkGlyph& glyph) {
    // TODO: can force down but not up
    /*
    SkMask::Format format = (SkMask::Format)glyph.fMaskFormat;
    switch (glyph.getGlyphID() % 4) {
        case 0: format = SkMask::kLCD16_Format; break;
        case 1: format = SkMask::kA8_Format; break;
        case 2: format = SkMask::kARGB32_Format; break;
        case 3: format = SkMask::kBW_Format; break;
    }
    const_cast<SkGlyph&>(glyph).fMaskFormat = format;
    */

    if (fFakeIt) {
        sk_bzero(glyph.fImage, glyph.computeImageSize());
        return;
    }

    if (SkMask::kARGB32_Format != glyph.fMaskFormat) {
        fProxy->getImage(glyph);
        return;
    }

    // If the format is ARGB, just draw the glyph from path.
    SkPath path;
    if (!fProxy->getPath(glyph.getPackedID(), &path)) {
        fProxy->getImage(glyph);
        return;
    }

    SkBitmap bm;
    bm.installPixels(SkImageInfo::MakeN32Premul(glyph.fWidth, glyph.fHeight),
                     glyph.fImage,
                     glyph.rowBytes());
    bm.eraseColor(0);

    SkCanvas canvas(bm);
    canvas.translate(-SkIntToScalar(glyph.fLeft), -SkIntToScalar(glyph.fTop));
    canvas.drawPath(path, this->getRandomTypeface()->paint());
}
Пример #9
0
void SkScalerContext::getImage(const SkGlyph& origGlyph) {
    const SkGlyph*  glyph = &origGlyph;
    SkGlyph         tmpGlyph;

    // in case we need to call generateImage on a mask-format that is different
    // (i.e. larger) than what our caller allocated by looking at origGlyph.
    SkAutoMalloc tmpGlyphImageStorage;

    // If we are going to draw-from-path, then we cannot generate color, since
    // the path only makes a mask. This case should have been caught up in
    // generateMetrics().
    SkASSERT(!fGenerateImageFromPath ||
             SkMask::kARGB32_Format != origGlyph.fMaskFormat);

    if (fMaskFilter) {   // restore the prefilter bounds
        tmpGlyph.initGlyphIdFrom(origGlyph);

        // need the original bounds, sans our maskfilter
        SkMaskFilter* mf = fMaskFilter;
        fMaskFilter = nullptr;             // temp disable
        this->getMetrics(&tmpGlyph);
        fMaskFilter = mf;               // restore

        // we need the prefilter bounds to be <= filter bounds
        SkASSERT(tmpGlyph.fWidth <= origGlyph.fWidth);
        SkASSERT(tmpGlyph.fHeight <= origGlyph.fHeight);

        if (tmpGlyph.fMaskFormat == origGlyph.fMaskFormat) {
            tmpGlyph.fImage = origGlyph.fImage;
        } else {
            tmpGlyphImageStorage.reset(tmpGlyph.computeImageSize());
            tmpGlyph.fImage = tmpGlyphImageStorage.get();
        }
        glyph = &tmpGlyph;
    }

    if (fGenerateImageFromPath) {
        SkPath      devPath, fillPath;
        SkMatrix    fillToDevMatrix;
        SkMask      mask;

        this->internalGetPath(*glyph, &fillPath, &devPath, &fillToDevMatrix);
        glyph->toMask(&mask);

        if (fRasterizer) {
            mask.fFormat = SkMask::kA8_Format;
            sk_bzero(glyph->fImage, mask.computeImageSize());

            if (!fRasterizer->rasterize(fillPath, fillToDevMatrix, nullptr,
                                        fMaskFilter, &mask,
                                        SkMask::kJustRenderImage_CreateMode)) {
                return;
            }
            if (fPreBlend.isApplicable()) {
                applyLUTToA8Mask(mask, fPreBlend.fG);
            }
        } else {
            SkASSERT(SkMask::kARGB32_Format != mask.fFormat);
            generateMask(mask, devPath, fPreBlend);
        }
    } else {
        generateImage(*glyph);
    }

    if (fMaskFilter) {
        SkMask      srcM, dstM;
        SkMatrix    matrix;

        // the src glyph image shouldn't be 3D
        SkASSERT(SkMask::k3D_Format != glyph->fMaskFormat);

        SkAutoSMalloc<32*32> a8storage;
        glyph->toMask(&srcM);
        if (SkMask::kARGB32_Format == srcM.fFormat) {
            // now we need to extract the alpha-channel from the glyph's image
            // and copy it into a temp buffer, and then point srcM at that temp.
            srcM.fFormat = SkMask::kA8_Format;
            srcM.fRowBytes = SkAlign4(srcM.fBounds.width());
            size_t size = srcM.computeImageSize();
            a8storage.reset(size);
            srcM.fImage = (uint8_t*)a8storage.get();
            extract_alpha(srcM,
                          (const SkPMColor*)glyph->fImage, glyph->rowBytes());
        }

        fRec.getMatrixFrom2x2(&matrix);

        if (fMaskFilter->filterMask(&dstM, srcM, matrix, nullptr)) {
            int width = SkFastMin32(origGlyph.fWidth, dstM.fBounds.width());
            int height = SkFastMin32(origGlyph.fHeight, dstM.fBounds.height());
            int dstRB = origGlyph.rowBytes();
            int srcRB = dstM.fRowBytes;

            const uint8_t* src = (const uint8_t*)dstM.fImage;
            uint8_t* dst = (uint8_t*)origGlyph.fImage;

            if (SkMask::k3D_Format == dstM.fFormat) {
                // we have to copy 3 times as much
                height *= 3;
            }

            // clean out our glyph, since it may be larger than dstM
            //sk_bzero(dst, height * dstRB);

            while (--height >= 0) {
                memcpy(dst, src, width);
                src += srcRB;
                dst += dstRB;
            }
            SkMask::FreeImage(dstM.fImage);

            if (fPreBlendForFilter.isApplicable()) {
                applyLUTToA8Mask(srcM, fPreBlendForFilter.fG);
            }
        }
    }
}
void SkScalerContext_FreeType_Base::generateGlyphImage(
    FT_Face face,
    const SkGlyph& glyph,
    const SkMatrix& bitmapTransform)
{
    const bool doBGR = SkToBool(fRec.fFlags & SkScalerContext::kLCD_BGROrder_Flag);
    const bool doVert = SkToBool(fRec.fFlags & SkScalerContext::kLCD_Vertical_Flag);

    switch ( face->glyph->format ) {
        case FT_GLYPH_FORMAT_OUTLINE: {
            FT_Outline* outline = &face->glyph->outline;

            int dx = 0, dy = 0;
            if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) {
                dx = SkFixedToFDot6(glyph.getSubXFixed());
                dy = SkFixedToFDot6(glyph.getSubYFixed());
                // negate dy since freetype-y-goes-up and skia-y-goes-down
                dy = -dy;
            }

            memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight);

            if (SkMask::kLCD16_Format == glyph.fMaskFormat) {
                FT_Outline_Translate(outline, dx, dy);
                FT_Error err = FT_Render_Glyph(face->glyph, doVert ? FT_RENDER_MODE_LCD_V :
                                                                     FT_RENDER_MODE_LCD);
                if (err) {
                    SK_TRACEFTR(err, "Could not render glyph.");
                    return;
                }

                SkMask mask;
                glyph.toMask(&mask);
#ifdef SK_SHOW_TEXT_BLIT_COVERAGE
                memset(mask.fImage, 0x80, mask.fBounds.height() * mask.fRowBytes);
#endif
                FT_GlyphSlotRec& ftGlyph = *face->glyph;

                if (!SkIRect::Intersects(mask.fBounds,
                                         SkIRect::MakeXYWH( ftGlyph.bitmap_left,
                                                           -ftGlyph.bitmap_top,
                                                            ftGlyph.bitmap.width,
                                                            ftGlyph.bitmap.rows)))
                {
                    return;
                }

                // If the FT_Bitmap extent is larger, discard bits of the bitmap outside the mask.
                // If the SkMask extent is larger, shrink mask to fit bitmap (clearing discarded).
                unsigned char* origBuffer = ftGlyph.bitmap.buffer;
                // First align the top left (origin).
                if (-ftGlyph.bitmap_top < mask.fBounds.fTop) {
                    int32_t topDiff = mask.fBounds.fTop - (-ftGlyph.bitmap_top);
                    ftGlyph.bitmap.buffer += ftGlyph.bitmap.pitch * topDiff;
                    ftGlyph.bitmap.rows -= topDiff;
                    ftGlyph.bitmap_top = -mask.fBounds.fTop;
                }
                if (ftGlyph.bitmap_left < mask.fBounds.fLeft) {
                    int32_t leftDiff = mask.fBounds.fLeft - ftGlyph.bitmap_left;
                    ftGlyph.bitmap.buffer += leftDiff;
                    ftGlyph.bitmap.width -= leftDiff;
                    ftGlyph.bitmap_left = mask.fBounds.fLeft;
                }
                if (mask.fBounds.fTop < -ftGlyph.bitmap_top) {
                    mask.fImage += mask.fRowBytes * (-ftGlyph.bitmap_top - mask.fBounds.fTop);
                    mask.fBounds.fTop = -ftGlyph.bitmap_top;
                }
                if (mask.fBounds.fLeft < ftGlyph.bitmap_left) {
                    mask.fImage += sizeof(uint16_t) * (ftGlyph.bitmap_left - mask.fBounds.fLeft);
                    mask.fBounds.fLeft = ftGlyph.bitmap_left;
                }
                // Origins aligned, clean up the width and height.
                int ftVertScale = (doVert ? 3 : 1);
                int ftHoriScale = (doVert ? 1 : 3);
                if (mask.fBounds.height() * ftVertScale < SkToInt(ftGlyph.bitmap.rows)) {
                    ftGlyph.bitmap.rows = mask.fBounds.height() * ftVertScale;
                }
                if (mask.fBounds.width() * ftHoriScale < SkToInt(ftGlyph.bitmap.width)) {
                    ftGlyph.bitmap.width = mask.fBounds.width() * ftHoriScale;
                }
                if (SkToInt(ftGlyph.bitmap.rows) < mask.fBounds.height() * ftVertScale) {
                    mask.fBounds.fBottom = mask.fBounds.fTop + ftGlyph.bitmap.rows / ftVertScale;
                }
                if (SkToInt(ftGlyph.bitmap.width) < mask.fBounds.width() * ftHoriScale) {
                    mask.fBounds.fRight = mask.fBounds.fLeft + ftGlyph.bitmap.width / ftHoriScale;
                }
                if (fPreBlend.isApplicable()) {
                    copyFT2LCD16<true>(ftGlyph.bitmap, mask, doBGR,
                                       fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
                } else {
                    copyFT2LCD16<false>(ftGlyph.bitmap, mask, doBGR,
                                        fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
                }
                // Restore the buffer pointer so FreeType can properly free it.
                ftGlyph.bitmap.buffer = origBuffer;
            } else {
                FT_BBox     bbox;
                FT_Bitmap   target;
                FT_Outline_Get_CBox(outline, &bbox);
                /*
                    what we really want to do for subpixel is
                        offset(dx, dy)
                        compute_bounds
                        offset(bbox & !63)
                    but that is two calls to offset, so we do the following, which
                    achieves the same thing with only one offset call.
                */
                FT_Outline_Translate(outline, dx - ((bbox.xMin + dx) & ~63),
                                              dy - ((bbox.yMin + dy) & ~63));

                target.width = glyph.fWidth;
                target.rows = glyph.fHeight;
                target.pitch = glyph.rowBytes();
                target.buffer = reinterpret_cast<uint8_t*>(glyph.fImage);
                target.pixel_mode = compute_pixel_mode( (SkMask::Format)fRec.fMaskFormat);
                target.num_grays = 256;

                FT_Outline_Get_Bitmap(face->glyph->library, outline, &target);
#ifdef SK_SHOW_TEXT_BLIT_COVERAGE
                for (int y = 0; y < glyph.fHeight; ++y) {
                    for (int x = 0; x < glyph.fWidth; ++x) {
                        uint8_t& a = ((uint8_t*)glyph.fImage)[(glyph.rowBytes() * y) + x];
                        a = SkTMax<uint8_t>(a, 0x20);
                    }
                }
#endif
            }
        } break;

        case FT_GLYPH_FORMAT_BITMAP: {
            FT_Pixel_Mode pixel_mode = static_cast<FT_Pixel_Mode>(face->glyph->bitmap.pixel_mode);
            SkMask::Format maskFormat = static_cast<SkMask::Format>(glyph.fMaskFormat);

            // Assume that the other formats do not exist.
            SkASSERT(FT_PIXEL_MODE_MONO == pixel_mode ||
                     FT_PIXEL_MODE_GRAY == pixel_mode ||
                     FT_PIXEL_MODE_BGRA == pixel_mode);

            // These are the only formats this ScalerContext should request.
            SkASSERT(SkMask::kBW_Format == maskFormat ||
                     SkMask::kA8_Format == maskFormat ||
                     SkMask::kARGB32_Format == maskFormat ||
                     SkMask::kLCD16_Format == maskFormat);

            // If no scaling needed, directly copy glyph bitmap.
            if (bitmapTransform.isIdentity()) {
                SkMask dstMask;
                glyph.toMask(&dstMask);
                copyFTBitmap(face->glyph->bitmap, dstMask);
                break;
            }

            // Otherwise, scale the bitmap.

            // Copy the FT_Bitmap into an SkBitmap (either A8 or ARGB)
            SkBitmap unscaledBitmap;
            // TODO: mark this as sRGB when the blits will be sRGB.
            unscaledBitmap.allocPixels(SkImageInfo::Make(face->glyph->bitmap.width,
                                                         face->glyph->bitmap.rows,
                                                         SkColorType_for_FTPixelMode(pixel_mode),
                                                         kPremul_SkAlphaType));

            SkMask unscaledBitmapAlias;
            unscaledBitmapAlias.fImage = reinterpret_cast<uint8_t*>(unscaledBitmap.getPixels());
            unscaledBitmapAlias.fBounds.set(0, 0, unscaledBitmap.width(), unscaledBitmap.height());
            unscaledBitmapAlias.fRowBytes = unscaledBitmap.rowBytes();
            unscaledBitmapAlias.fFormat = SkMaskFormat_for_SkColorType(unscaledBitmap.colorType());
            copyFTBitmap(face->glyph->bitmap, unscaledBitmapAlias);

            // Wrap the glyph's mask in a bitmap, unless the glyph's mask is BW or LCD.
            // BW requires an A8 target for resizing, which can then be down sampled.
            // LCD should use a 4x A8 target, which will then be down sampled.
            // For simplicity, LCD uses A8 and is replicated.
            int bitmapRowBytes = 0;
            if (SkMask::kBW_Format != maskFormat && SkMask::kLCD16_Format != maskFormat) {
                bitmapRowBytes = glyph.rowBytes();
            }
            SkBitmap dstBitmap;
            // TODO: mark this as sRGB when the blits will be sRGB.
            dstBitmap.setInfo(SkImageInfo::Make(glyph.fWidth, glyph.fHeight,
                                                SkColorType_for_SkMaskFormat(maskFormat),
                                                kPremul_SkAlphaType),
                              bitmapRowBytes);
            if (SkMask::kBW_Format == maskFormat || SkMask::kLCD16_Format == maskFormat) {
                dstBitmap.allocPixels();
            } else {
                dstBitmap.setPixels(glyph.fImage);
            }

            // Scale unscaledBitmap into dstBitmap.
            SkCanvas canvas(dstBitmap);
#ifdef SK_SHOW_TEXT_BLIT_COVERAGE
            canvas.clear(0x33FF0000);
#else
            canvas.clear(SK_ColorTRANSPARENT);
#endif
            canvas.translate(-glyph.fLeft, -glyph.fTop);
            canvas.concat(bitmapTransform);
            canvas.translate(face->glyph->bitmap_left, -face->glyph->bitmap_top);

            SkPaint paint;
            paint.setFilterQuality(kMedium_SkFilterQuality);
            canvas.drawBitmap(unscaledBitmap, 0, 0, &paint);

            // If the destination is BW or LCD, convert from A8.
            if (SkMask::kBW_Format == maskFormat) {
                // Copy the A8 dstBitmap into the A1 glyph.fImage.
                SkMask dstMask;
                glyph.toMask(&dstMask);
                packA8ToA1(dstMask, dstBitmap.getAddr8(0, 0), dstBitmap.rowBytes());
            } else if (SkMask::kLCD16_Format == maskFormat) {
                // Copy the A8 dstBitmap into the LCD16 glyph.fImage.
                uint8_t* src = dstBitmap.getAddr8(0, 0);
                uint16_t* dst = reinterpret_cast<uint16_t*>(glyph.fImage);
                for (int y = dstBitmap.height(); y --> 0;) {
                    for (int x = 0; x < dstBitmap.width(); ++x) {
                        dst[x] = grayToRGB16(src[x]);
                    }
                    dst = (uint16_t*)((char*)dst + glyph.rowBytes());
                    src += dstBitmap.rowBytes();
                }
            }

        } break;

        default:
            SkDEBUGFAIL("unknown glyph format");
            memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight);
            return;
    }

// We used to always do this pre-USE_COLOR_LUMINANCE, but with colorlum,
// it is optional
#if defined(SK_GAMMA_APPLY_TO_A8)
    if (SkMask::kA8_Format == glyph.fMaskFormat && fPreBlend.isApplicable()) {
        uint8_t* SK_RESTRICT dst = (uint8_t*)glyph.fImage;
        unsigned rowBytes = glyph.rowBytes();

        for (int y = glyph.fHeight - 1; y >= 0; --y) {
            for (int x = glyph.fWidth - 1; x >= 0; --x) {
                dst[x] = fPreBlend.fG[dst[x]];
            }
            dst += rowBytes;
        }
    }
#endif
}
Пример #11
0
static void copyFT2LCD16(const SkGlyph& glyph, const FT_Bitmap& bitmap,
                         int lcdIsBGR, bool lcdIsVert, const uint8_t* tableR,
                         const uint8_t* tableG, const uint8_t* tableB) {
    if (lcdIsVert) {
        SkASSERT(3 * glyph.fHeight == bitmap.rows);
    } else {
        SkASSERT(glyph.fHeight == bitmap.rows);
    }

    uint16_t* dst = reinterpret_cast<uint16_t*>(glyph.fImage);
    const size_t dstRB = glyph.rowBytes();
    const int width = glyph.fWidth;
    const uint8_t* src = bitmap.buffer;

    switch (bitmap.pixel_mode) {
        case FT_PIXEL_MODE_MONO: {
            for (int y = 0; y < glyph.fHeight; ++y) {
                for (int x = 0; x < width; ++x) {
                    dst[x] = -bittst(src, x);
                }
                dst = (uint16_t*)((char*)dst + dstRB);
                src += bitmap.pitch;
            }
        } break;
        case FT_PIXEL_MODE_GRAY: {
            for (int y = 0; y < glyph.fHeight; ++y) {
                for (int x = 0; x < width; ++x) {
                    dst[x] = grayToRGB16(src[x]);
                }
                dst = (uint16_t*)((char*)dst + dstRB);
                src += bitmap.pitch;
            }
        } break;
        default: {
            SkASSERT(lcdIsVert || (glyph.fWidth * 3 == bitmap.width));
            for (int y = 0; y < glyph.fHeight; y++) {
                if (lcdIsVert) {    // vertical stripes
                    const uint8_t* srcR = src;
                    const uint8_t* srcG = srcR + bitmap.pitch;
                    const uint8_t* srcB = srcG + bitmap.pitch;
                    if (lcdIsBGR) {
                        SkTSwap(srcR, srcB);
                    }
                    for (int x = 0; x < width; x++) {
                        dst[x] = packTriple(sk_apply_lut_if<APPLY_PREBLEND>(*srcR++, tableR),
                                            sk_apply_lut_if<APPLY_PREBLEND>(*srcG++, tableG),
                                            sk_apply_lut_if<APPLY_PREBLEND>(*srcB++, tableB));
                    }
                    src += 3 * bitmap.pitch;
                } else {            // horizontal stripes
                    const uint8_t* triple = src;
                    if (lcdIsBGR) {
                        for (int x = 0; x < width; x++) {
                            dst[x] = packTriple(sk_apply_lut_if<APPLY_PREBLEND>(triple[2], tableR),
                                                sk_apply_lut_if<APPLY_PREBLEND>(triple[1], tableG),
                                                sk_apply_lut_if<APPLY_PREBLEND>(triple[0], tableB));
                            triple += 3;
                        }
                    } else {
                        for (int x = 0; x < width; x++) {
                            dst[x] = packTriple(sk_apply_lut_if<APPLY_PREBLEND>(triple[0], tableR),
                                                sk_apply_lut_if<APPLY_PREBLEND>(triple[1], tableG),
                                                sk_apply_lut_if<APPLY_PREBLEND>(triple[2], tableB));
                            triple += 3;
                        }
                    }
                    src += bitmap.pitch;
                }
                dst = (uint16_t*)((char*)dst + dstRB);
            }
        } break;
    }
}
Пример #12
0
void SkScalerContext_FreeType_Base::generateGlyphImage(FT_Face face, const SkGlyph& glyph) {
    const bool doBGR = SkToBool(fRec.fFlags & SkScalerContext::kLCD_BGROrder_Flag);
    const bool doVert = SkToBool(fRec.fFlags & SkScalerContext::kLCD_Vertical_Flag);

    switch ( face->glyph->format ) {
        case FT_GLYPH_FORMAT_OUTLINE: {
            FT_Outline* outline = &face->glyph->outline;
            FT_BBox     bbox;
            FT_Bitmap   target;

            if (fRec.fFlags & SkScalerContext::kEmbolden_Flag) {
                emboldenOutline(face, outline);
            }

            int dx = 0, dy = 0;
            if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) {
                dx = SkFixedToFDot6(glyph.getSubXFixed());
                dy = SkFixedToFDot6(glyph.getSubYFixed());
                // negate dy since freetype-y-goes-up and skia-y-goes-down
                dy = -dy;
            }
            FT_Outline_Get_CBox(outline, &bbox);
            /*
                what we really want to do for subpixel is
                    offset(dx, dy)
                    compute_bounds
                    offset(bbox & !63)
                but that is two calls to offset, so we do the following, which
                achieves the same thing with only one offset call.
            */
            FT_Outline_Translate(outline, dx - ((bbox.xMin + dx) & ~63),
                                          dy - ((bbox.yMin + dy) & ~63));

            if (SkMask::kLCD16_Format == glyph.fMaskFormat) {
                FT_Render_Glyph(face->glyph, doVert ? FT_RENDER_MODE_LCD_V : FT_RENDER_MODE_LCD);
                if (fPreBlend.isApplicable()) {
                    copyFT2LCD16<true>(glyph, face->glyph->bitmap, doBGR, doVert,
                                       fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
                } else {
                    copyFT2LCD16<false>(glyph, face->glyph->bitmap, doBGR, doVert,
                                        fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
                }
            } else {
                target.width = glyph.fWidth;
                target.rows = glyph.fHeight;
                target.pitch = glyph.rowBytes();
                target.buffer = reinterpret_cast<uint8_t*>(glyph.fImage);
                target.pixel_mode = compute_pixel_mode(
                                                (SkMask::Format)fRec.fMaskFormat);
                target.num_grays = 256;

                memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight);
                FT_Outline_Get_Bitmap(face->glyph->library, outline, &target);
            }
        } break;

        case FT_GLYPH_FORMAT_BITMAP: {
            if (fRec.fFlags & SkScalerContext::kEmbolden_Flag) {
                FT_GlyphSlot_Own_Bitmap(face->glyph);
                FT_Bitmap_Embolden(face->glyph->library, &face->glyph->bitmap, kBitmapEmboldenStrength, 0);
            }
            SkASSERT_CONTINUE(glyph.fWidth == face->glyph->bitmap.width);
            SkASSERT_CONTINUE(glyph.fHeight == face->glyph->bitmap.rows);
            SkASSERT_CONTINUE(glyph.fTop == -face->glyph->bitmap_top);
            SkASSERT_CONTINUE(glyph.fLeft == face->glyph->bitmap_left);

            const uint8_t*  src = (const uint8_t*)face->glyph->bitmap.buffer;
            uint8_t*        dst = (uint8_t*)glyph.fImage;

            if (face->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_GRAY ||
                (face->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO &&
                 glyph.fMaskFormat == SkMask::kBW_Format)) {
                unsigned    srcRowBytes = face->glyph->bitmap.pitch;
                unsigned    dstRowBytes = glyph.rowBytes();
                unsigned    minRowBytes = SkMin32(srcRowBytes, dstRowBytes);
                unsigned    extraRowBytes = dstRowBytes - minRowBytes;

                for (int y = face->glyph->bitmap.rows - 1; y >= 0; --y) {
                    memcpy(dst, src, minRowBytes);
                    memset(dst + minRowBytes, 0, extraRowBytes);
                    src += srcRowBytes;
                    dst += dstRowBytes;
                }
            } else if (face->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO &&
                       glyph.fMaskFormat == SkMask::kA8_Format) {
                for (int y = 0; y < face->glyph->bitmap.rows; ++y) {
                    uint8_t byte = 0;
                    int bits = 0;
                    const uint8_t* src_row = src;
                    uint8_t* dst_row = dst;

                    for (int x = 0; x < face->glyph->bitmap.width; ++x) {
                        if (!bits) {
                            byte = *src_row++;
                            bits = 8;
                        }

                        *dst_row++ = byte & 0x80 ? 0xff : 0;
                        bits--;
                        byte <<= 1;
                    }

                    src += face->glyph->bitmap.pitch;
                    dst += glyph.rowBytes();
                }
            } else if (SkMask::kLCD16_Format == glyph.fMaskFormat) {
                if (fPreBlend.isApplicable()) {
                    copyFT2LCD16<true>(glyph, face->glyph->bitmap, doBGR, doVert,
                                       fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
                } else {
                    copyFT2LCD16<false>(glyph, face->glyph->bitmap, doBGR, doVert,
                                        fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
                }
            } else {
                SkDEBUGFAIL("unknown glyph bitmap transform needed");
            }
        } break;

    default:
        SkDEBUGFAIL("unknown glyph format");
        memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight);
        return;
    }

// We used to always do this pre-USE_COLOR_LUMINANCE, but with colorlum,
// it is optional
#if defined(SK_GAMMA_APPLY_TO_A8)
    if (SkMask::kA8_Format == glyph.fMaskFormat && fPreBlend.isApplicable()) {
        uint8_t* SK_RESTRICT dst = (uint8_t*)glyph.fImage;
        unsigned rowBytes = glyph.rowBytes();

        for (int y = glyph.fHeight - 1; y >= 0; --y) {
            for (int x = glyph.fWidth - 1; x >= 0; --x) {
                dst[x] = fPreBlend.fG[dst[x]];
            }
            dst += rowBytes;
        }
    }
#endif
}
Пример #13
0
void SkScalerContext_Windows::generateImage(const SkGlyph& glyph) {

    SkAutoMutexAcquire  ac(gFTMutex);

    SkASSERT(fDDC);

    if (SkMask::kLCD16_Format == fRec.fMaskFormat) {
        HDC dc = CreateCompatibleDC(0);
        void* bits = 0;
        BITMAPINFO info;
        sk_bzero(&info, sizeof(info));
        info.bmiHeader.biSize = sizeof(info.bmiHeader);
        info.bmiHeader.biWidth = glyph.fWidth;
        info.bmiHeader.biHeight = glyph.fHeight;
        info.bmiHeader.biPlanes = 1;
        info.bmiHeader.biBitCount = 32;
        info.bmiHeader.biCompression = BI_RGB;
        HBITMAP bm = CreateDIBSection(dc, &info, DIB_RGB_COLORS, &bits, 0, 0);
        SelectObject(dc, bm);

        // erase to white
        size_t srcRB = glyph.fWidth << 2;
        size_t size = glyph.fHeight * srcRB;
        memset(bits, 0xFF, size);

        SetBkMode(dc, TRANSPARENT);
        SetTextAlign(dc, TA_LEFT | TA_BASELINE);
        SetGraphicsMode(dc, GM_ADVANCED);

        XFORM xform = fXform;
        xform.eDx = (float)-glyph.fLeft;
        xform.eDy = (float)-glyph.fTop;
        SetWorldTransform(dc, &xform);

        HGDIOBJ prevFont = SelectObject(dc, fFont);
        COLORREF color = SetTextColor(dc, 0); // black
        SkASSERT(color != CLR_INVALID);
        uint16_t glyphID = glyph.getGlyphID();
        ExtTextOut(dc, 0, 0, ETO_GLYPH_INDEX, NULL, (LPCWSTR)&glyphID, 1, NULL);
        GdiFlush();

        // downsample from rgba to rgb565
        int width = glyph.fWidth;
        size_t dstRB = glyph.rowBytes();
        const uint32_t* src = (const uint32_t*)bits;
        // gdi's bitmap is upside-down, so we reverse dst walking in Y
        uint16_t* dst = (uint16_t*)((char*)glyph.fImage + (glyph.fHeight - 1) * dstRB);
        for (int y = 0; y < glyph.fHeight; y++) {
            for (int i = 0; i < width; i++) {
                dst[i] = rgb_to_lcd16(src[i]);
            }
            src = (const uint32_t*)((const char*)src + srcRB);
            dst = (uint16_t*)((char*)dst - dstRB);
        }

        DeleteDC(dc);
        DeleteObject(bm);
        return;
    }

    GLYPHMETRICS gm;
    memset(&gm, 0, sizeof(gm));
    uint32_t bytecount = 0;
    uint32_t total_size = GetGlyphOutlineW(fDDC, glyph.fID, GGO_GRAY8_BITMAP | GGO_GLYPH_INDEX, &gm, 0, NULL, &fMat22);
    if (GDI_ERROR != total_size && total_size > 0) {
        uint8_t *pBuff = new uint8_t[total_size];
        if (NULL != pBuff) {
            total_size = GetGlyphOutlineW(fDDC, glyph.fID, GGO_GRAY8_BITMAP | GGO_GLYPH_INDEX, &gm, total_size, pBuff, &fMat22);

            SkASSERT(total_size != GDI_ERROR);

            SkASSERT(glyph.fWidth == gm.gmBlackBoxX);
            SkASSERT(glyph.fHeight == gm.gmBlackBoxY);

            uint8_t* dst = (uint8_t*)glyph.fImage;
            uint32_t pitch = (gm.gmBlackBoxX + 3) & ~0x3;
            if (pitch != glyph.rowBytes()) {
                SkASSERT(false); // glyph.fImage has different rowsize!?
            }

            for (int32_t y = gm.gmBlackBoxY - 1; y >= 0; y--) {
                uint8_t* src = pBuff + pitch * y;

                for (uint32_t x = 0; x < gm.gmBlackBoxX; x++) {
                    if (*src > 63) {
                        *dst = 0xFF;
                    }
                    else {
                        *dst = *src << 2; // scale to 0-255
                    }
                    dst++;
                    src++;
                    bytecount++;
                }
                memset(dst, 0, glyph.rowBytes() - glyph.fWidth);
                dst += glyph.rowBytes() - glyph.fWidth;
            }

            delete[] pBuff;
        }
    }

    SkASSERT(GDI_ERROR != total_size && total_size >= 0);

}
Пример #14
0
void SkScalerContext::getImage(const SkGlyph& origGlyph) {
    const SkGlyph*  glyph = &origGlyph;
    SkGlyph         tmpGlyph;

    if (fMaskFilter) {   // restore the prefilter bounds
        tmpGlyph.init(origGlyph.fID);

        // need the original bounds, sans our maskfilter
        SkMaskFilter* mf = fMaskFilter;
        fMaskFilter = NULL;             // temp disable
        this->getMetrics(&tmpGlyph);
        fMaskFilter = mf;               // restore

        tmpGlyph.fImage = origGlyph.fImage;

        // we need the prefilter bounds to be <= filter bounds
        SkASSERT(tmpGlyph.fWidth <= origGlyph.fWidth);
        SkASSERT(tmpGlyph.fHeight <= origGlyph.fHeight);
        glyph = &tmpGlyph;
    }

    if (fGenerateImageFromPath) {
        SkPath      devPath, fillPath;
        SkMatrix    fillToDevMatrix;
        SkMask      mask;

        this->internalGetPath(*glyph, &fillPath, &devPath, &fillToDevMatrix);
        glyph->toMask(&mask);

        if (fRasterizer) {
            mask.fFormat = SkMask::kA8_Format;
            sk_bzero(glyph->fImage, mask.computeImageSize());

            if (!fRasterizer->rasterize(fillPath, fillToDevMatrix, NULL,
                                        fMaskFilter, &mask,
                                        SkMask::kJustRenderImage_CreateMode)) {
                return;
            }
        } else {
            generateMask(mask, devPath);
        }
    } else {
        this->getGlyphContext(*glyph)->generateImage(*glyph);
    }

    if (fMaskFilter) {
        SkMask      srcM, dstM;
        SkMatrix    matrix;

        // the src glyph image shouldn't be 3D
        SkASSERT(SkMask::k3D_Format != glyph->fMaskFormat);
        glyph->toMask(&srcM);
        fRec.getMatrixFrom2x2(&matrix);

        if (fMaskFilter->filterMask(&dstM, srcM, matrix, NULL)) {
            int width = SkFastMin32(origGlyph.fWidth, dstM.fBounds.width());
            int height = SkFastMin32(origGlyph.fHeight, dstM.fBounds.height());
            int dstRB = origGlyph.rowBytes();
            int srcRB = dstM.fRowBytes;

            const uint8_t* src = (const uint8_t*)dstM.fImage;
            uint8_t* dst = (uint8_t*)origGlyph.fImage;

            if (SkMask::k3D_Format == dstM.fFormat) {
                // we have to copy 3 times as much
                height *= 3;
            }

            // clean out our glyph, since it may be larger than dstM
            //sk_bzero(dst, height * dstRB);

            while (--height >= 0) {
                memcpy(dst, src, width);
                src += srcRB;
                dst += dstRB;
            }
            SkMask::FreeImage(dstM.fImage);
        }
    }
}
Пример #15
0
void SkScalerContext_Windows::generateImage(const SkGlyph& glyph) {

    SkAutoMutexAcquire  ac(gFTMutex);

    SkASSERT(fDDC);

    const bool isBW = SkMask::kBW_Format == fRec.fMaskFormat;
    if ((SkMask::kLCD16_Format == fRec.fMaskFormat) || isBW) {
        HDC dc = CreateCompatibleDC(0);
        void* bits = 0;
        int biWidth = isBW ? alignTo32(glyph.fWidth) : glyph.fWidth;
        MyBitmapInfo info;
        sk_bzero(&info, sizeof(info));
        if (isBW) {
            RGBQUAD blackQuad = { 0, 0, 0, 0 };
            RGBQUAD whiteQuad = { 0xFF, 0xFF, 0xFF, 0 };
            info.bmiColors[0] = blackQuad;
            info.bmiColors[1] = whiteQuad;
        }
        info.bmiHeader.biSize = sizeof(info.bmiHeader);
        info.bmiHeader.biWidth = biWidth;
        info.bmiHeader.biHeight = glyph.fHeight;
        info.bmiHeader.biPlanes = 1;
        info.bmiHeader.biBitCount = isBW ? 1 : 32;
        info.bmiHeader.biCompression = BI_RGB;
        if (isBW) {
            info.bmiHeader.biClrUsed = 2;
        }
        HBITMAP bm = CreateDIBSection(dc, &info, DIB_RGB_COLORS, &bits, 0, 0);
        SelectObject(dc, bm);

        // erase to white
        size_t srcRB = isBW ? (biWidth >> 3) : (glyph.fWidth << 2);
        size_t size = glyph.fHeight * srcRB;
        memset(bits, isBW ? 0 : 0xFF, size);

        SetGraphicsMode(dc, GM_ADVANCED);
        SetBkMode(dc, TRANSPARENT);
        SetTextAlign(dc, TA_LEFT | TA_BASELINE);

        XFORM xform = fXform;
        xform.eDx = (float)-glyph.fLeft;
        xform.eDy = (float)-glyph.fTop;
        SetWorldTransform(dc, &xform);

        HGDIOBJ prevFont = SelectObject(dc, fFont);
        COLORREF color = SetTextColor(dc, isBW ? 0xFFFFFF : 0);
        SkASSERT(color != CLR_INVALID);
        uint16_t glyphID = glyph.getGlyphID();
#if defined(UNICODE)
        ExtTextOut(dc, 0, 0, ETO_GLYPH_INDEX, NULL, (LPCWSTR)&glyphID, 1, NULL);
#else
        ExtTextOut(dc, 0, 0, ETO_GLYPH_INDEX, NULL, (LPCSTR)&glyphID, 1, NULL);
#endif
        GdiFlush();

        // downsample from rgba to rgb565
        int width = glyph.fWidth;
        size_t dstRB = glyph.rowBytes();
        if (isBW) {
            const uint8_t* src = (const uint8_t*)bits;
            // gdi's bitmap is upside-down, so we reverse dst walking in Y
            uint8_t* dst = (uint8_t*)((char*)glyph.fImage + (glyph.fHeight - 1) * dstRB);
            for (int y = 0; y < glyph.fHeight; y++) {
                memcpy(dst, src, dstRB);
                src += srcRB;
                dst -= dstRB;
            }
        } else {    // LCD16
            const uint32_t* src = (const uint32_t*)bits;
            // gdi's bitmap is upside-down, so we reverse dst walking in Y
            uint16_t* dst = (uint16_t*)((char*)glyph.fImage + (glyph.fHeight - 1) * dstRB);
            for (int y = 0; y < glyph.fHeight; y++) {
                for (int i = 0; i < width; i++) {
                    dst[i] = rgb_to_lcd16(src[i]);
                }
                src = (const uint32_t*)((const char*)src + srcRB);
                dst = (uint16_t*)((char*)dst - dstRB);
            }
        }

        DeleteDC(dc);
        DeleteObject(bm);
        return;
    }
Пример #16
0
void SkScalerContext::getImage(const SkGlyph& origGlyph) {
    const SkGlyph*  glyph = &origGlyph;
    SkGlyph         tmpGlyph;

    if (fMaskFilter) {   // restore the prefilter bounds
        tmpGlyph.init(origGlyph.fID);

        // need the original bounds, sans our maskfilter
        SkMaskFilter* mf = fMaskFilter;
        fMaskFilter = NULL;             // temp disable
        this->getMetrics(&tmpGlyph);
        fMaskFilter = mf;               // restore

        tmpGlyph.fImage = origGlyph.fImage;

        // we need the prefilter bounds to be <= filter bounds
        SkASSERT(tmpGlyph.fWidth <= origGlyph.fWidth);
        SkASSERT(tmpGlyph.fHeight <= origGlyph.fHeight);
        glyph = &tmpGlyph;
    }

    if (fRec.fFrameWidth > 0 || fPathEffect != NULL || fRasterizer != NULL) {
        SkPath      devPath, fillPath;
        SkMatrix    fillToDevMatrix;

        this->internalGetPath(*glyph, &fillPath, &devPath, &fillToDevMatrix);

        if (fRasterizer) {
            SkMask  mask;

            glyph->toMask(&mask);
            mask.fFormat = SkMask::kA8_Format;
            sk_bzero(glyph->fImage, mask.computeImageSize());

            if (!fRasterizer->rasterize(fillPath, fillToDevMatrix, NULL,
                                        fMaskFilter, &mask,
                                        SkMask::kJustRenderImage_CreateMode)) {
                return;
            }
        } else {
            SkBitmap    bm;
            SkBitmap::Config config;
            SkMatrix    matrix;
            SkRegion    clip;
            SkPaint     paint;
            SkDraw      draw;

            if (SkMask::kA8_Format == fRec.fMaskFormat) {
                config = SkBitmap::kA8_Config;
                paint.setAntiAlias(true);
            } else {
                SkASSERT(SkMask::kBW_Format == fRec.fMaskFormat);
                config = SkBitmap::kA1_Config;
                paint.setAntiAlias(false);
            }

            clip.setRect(0, 0, glyph->fWidth, glyph->fHeight);
            matrix.setTranslate(-SkIntToScalar(glyph->fLeft),
                                -SkIntToScalar(glyph->fTop));
            bm.setConfig(config, glyph->fWidth, glyph->fHeight,
                         glyph->rowBytes());
            bm.setPixels(glyph->fImage);
            sk_bzero(glyph->fImage, bm.height() * bm.rowBytes());

            draw.fClip  = &clip;
            draw.fMatrix = &matrix;
            draw.fBitmap = &bm;
            draw.fBounder = NULL;
            draw.drawPath(devPath, paint);
        }
    } else {
        this->getGlyphContext(*glyph)->generateImage(*glyph);
    }

    if (fMaskFilter) {
        SkMask      srcM, dstM;
        SkMatrix    matrix;

        // the src glyph image shouldn't be 3D
        SkASSERT(SkMask::k3D_Format != glyph->fMaskFormat);
        glyph->toMask(&srcM);
        fRec.getMatrixFrom2x2(&matrix);

        if (fMaskFilter->filterMask(&dstM, srcM, matrix, NULL)) {
            int width = SkFastMin32(origGlyph.fWidth, dstM.fBounds.width());
            int height = SkFastMin32(origGlyph.fHeight, dstM.fBounds.height());
            int dstRB = origGlyph.rowBytes();
            int srcRB = dstM.fRowBytes;

            const uint8_t* src = (const uint8_t*)dstM.fImage;
            uint8_t* dst = (uint8_t*)origGlyph.fImage;

            if (SkMask::k3D_Format == dstM.fFormat) {
                // we have to copy 3 times as much
                height *= 3;
            }

            // clean out our glyph, since it may be larger than dstM
            //sk_bzero(dst, height * dstRB);

            while (--height >= 0) {
                memcpy(dst, src, width);
                src += srcRB;
                dst += dstRB;
            }
            SkMask::FreeImage(dstM.fImage);
        }
    }

    // check to see if we should filter the alpha channel

    if (NULL == fMaskFilter &&
        fRec.fMaskFormat != SkMask::kBW_Format &&
        fRec.fMaskFormat != SkMask::kLCD16_Format &&
        fRec.fMaskFormat != SkMask::kLCD32_Format &&
        (fRec.fFlags & (kGammaForBlack_Flag | kGammaForWhite_Flag)) != 0)
    {
        const uint8_t* table = (fRec.fFlags & kGammaForBlack_Flag) ? gBlackGammaTable : gWhiteGammaTable;
        if (NULL != table) {
            uint8_t* dst = (uint8_t*)origGlyph.fImage;
            unsigned rowBytes = origGlyph.rowBytes();

            for (int y = origGlyph.fHeight - 1; y >= 0; --y) {
                for (int x = origGlyph.fWidth - 1; x >= 0; --x) {
                    dst[x] = table[dst[x]];
                }
                dst += rowBytes;
            }
        }
    }
}
Пример #17
0
void SkScalerContext_FreeType_Base::generateGlyphImage(FT_Face face, const SkGlyph& glyph) {
    const bool doBGR = SkToBool(fRec.fFlags & SkScalerContext::kLCD_BGROrder_Flag);
    const bool doVert = SkToBool(fRec.fFlags & SkScalerContext::kLCD_Vertical_Flag);

    switch ( face->glyph->format ) {
        case FT_GLYPH_FORMAT_OUTLINE: {
            FT_Outline* outline = &face->glyph->outline;
            FT_BBox     bbox;
            FT_Bitmap   target;

            if (fRec.fFlags & SkScalerContext::kEmbolden_Flag &&
                !(face->style_flags & FT_STYLE_FLAG_BOLD)) {
                emboldenOutline(face, outline);
            }

            int dx = 0, dy = 0;
            if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) {
                dx = SkFixedToFDot6(glyph.getSubXFixed());
                dy = SkFixedToFDot6(glyph.getSubYFixed());
                // negate dy since freetype-y-goes-up and skia-y-goes-down
                dy = -dy;
            }
            FT_Outline_Get_CBox(outline, &bbox);
            /*
                what we really want to do for subpixel is
                    offset(dx, dy)
                    compute_bounds
                    offset(bbox & !63)
                but that is two calls to offset, so we do the following, which
                achieves the same thing with only one offset call.
            */
            FT_Outline_Translate(outline, dx - ((bbox.xMin + dx) & ~63),
                                          dy - ((bbox.yMin + dy) & ~63));

            if (SkMask::kLCD16_Format == glyph.fMaskFormat) {
                FT_Render_Glyph(face->glyph, doVert ? FT_RENDER_MODE_LCD_V : FT_RENDER_MODE_LCD);
                SkMask mask;
                glyph.toMask(&mask);
                if (fPreBlend.isApplicable()) {
                    copyFT2LCD16<true>(face->glyph->bitmap, mask, doBGR,
                                       fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
                } else {
                    copyFT2LCD16<false>(face->glyph->bitmap, mask, doBGR,
                                        fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
                }
            } else {
                target.width = glyph.fWidth;
                target.rows = glyph.fHeight;
                target.pitch = glyph.rowBytes();
                target.buffer = reinterpret_cast<uint8_t*>(glyph.fImage);
                target.pixel_mode = compute_pixel_mode( (SkMask::Format)fRec.fMaskFormat);
                target.num_grays = 256;

                memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight);
                FT_Outline_Get_Bitmap(face->glyph->library, outline, &target);
            }
        } break;

        case FT_GLYPH_FORMAT_BITMAP: {
            FT_Pixel_Mode pixel_mode = static_cast<FT_Pixel_Mode>(face->glyph->bitmap.pixel_mode);
            SkMask::Format maskFormat = static_cast<SkMask::Format>(glyph.fMaskFormat);

            // Assume that the other formats do not exist.
            SkASSERT(FT_PIXEL_MODE_MONO == pixel_mode ||
                     FT_PIXEL_MODE_GRAY == pixel_mode ||
                     FT_PIXEL_MODE_BGRA == pixel_mode);

            // These are the only formats this ScalerContext should request.
            SkASSERT(SkMask::kBW_Format == maskFormat ||
                     SkMask::kA8_Format == maskFormat ||
                     SkMask::kARGB32_Format == maskFormat ||
                     SkMask::kLCD16_Format == maskFormat);

            if (fRec.fFlags & SkScalerContext::kEmbolden_Flag &&
                !(face->style_flags & FT_STYLE_FLAG_BOLD))
            {
                FT_GlyphSlot_Own_Bitmap(face->glyph);
                FT_Bitmap_Embolden(face->glyph->library, &face->glyph->bitmap,
                                   kBitmapEmboldenStrength, 0);
            }

            // If no scaling needed, directly copy glyph bitmap.
            if (glyph.fWidth == face->glyph->bitmap.width &&
                glyph.fHeight == face->glyph->bitmap.rows &&
                glyph.fTop == -face->glyph->bitmap_top &&
                glyph.fLeft == face->glyph->bitmap_left)
            {
                SkMask dstMask;
                glyph.toMask(&dstMask);
                copyFTBitmap(face->glyph->bitmap, dstMask);
                break;
            }

            // Otherwise, scale the bitmap.

            // Copy the FT_Bitmap into an SkBitmap (either A8 or ARGB)
            SkBitmap unscaledBitmap;
            unscaledBitmap.setConfig(SkBitmapConfig_for_FTPixelMode(pixel_mode),
                                     face->glyph->bitmap.width, face->glyph->bitmap.rows);
            unscaledBitmap.allocPixels();

            SkMask unscaledBitmapAlias;
            unscaledBitmapAlias.fImage = reinterpret_cast<uint8_t*>(unscaledBitmap.getPixels());
            unscaledBitmapAlias.fBounds.set(0, 0, unscaledBitmap.width(), unscaledBitmap.height());
            unscaledBitmapAlias.fRowBytes = unscaledBitmap.rowBytes();
            unscaledBitmapAlias.fFormat = SkMaskFormat_for_SkBitmapConfig(unscaledBitmap.config());
            copyFTBitmap(face->glyph->bitmap, unscaledBitmapAlias);

            // Wrap the glyph's mask in a bitmap, unless the glyph's mask is BW or LCD.
            // BW requires an A8 target for resizing, which can then be down sampled.
            // LCD should use a 4x A8 target, which will then be down sampled.
            // For simplicity, LCD uses A8 and is replicated.
            int bitmapRowBytes = 0;
            if (SkMask::kBW_Format != maskFormat && SkMask::kLCD16_Format != maskFormat) {
                bitmapRowBytes = glyph.rowBytes();
            }
            SkBitmap dstBitmap;
            dstBitmap.setConfig(SkBitmapConfig_for_SkMaskFormat(maskFormat),
                                glyph.fWidth, glyph.fHeight, bitmapRowBytes);
            if (SkMask::kBW_Format == maskFormat || SkMask::kLCD16_Format == maskFormat) {
                dstBitmap.allocPixels();
            } else {
                dstBitmap.setPixels(glyph.fImage);
            }

            // Scale unscaledBitmap into dstBitmap.
            SkCanvas canvas(dstBitmap);
            canvas.clear(SK_ColorTRANSPARENT);
            canvas.scale(SkIntToScalar(glyph.fWidth) / SkIntToScalar(face->glyph->bitmap.width),
                         SkIntToScalar(glyph.fHeight) / SkIntToScalar(face->glyph->bitmap.rows));
            SkPaint paint;
            paint.setFilterLevel(SkPaint::kLow_FilterLevel);
            canvas.drawBitmap(unscaledBitmap, 0, 0, &paint);

            // If the destination is BW or LCD, convert from A8.
            if (SkMask::kBW_Format == maskFormat) {
                // Copy the A8 dstBitmap into the A1 glyph.fImage.
                SkMask dstMask;
                glyph.toMask(&dstMask);
                packA8ToA1(dstMask, dstBitmap.getAddr8(0, 0), dstBitmap.rowBytes());
            } else if (SkMask::kLCD16_Format == maskFormat) {
                // Copy the A8 dstBitmap into the LCD16 glyph.fImage.
                uint8_t* src = dstBitmap.getAddr8(0, 0);
                uint16_t* dst = reinterpret_cast<uint16_t*>(glyph.fImage);
                for (int y = dstBitmap.height(); y --> 0;) {
                    for (int x = 0; x < dstBitmap.width(); ++x) {
                        dst[x] = grayToRGB16(src[x]);
                    }
                    dst = (uint16_t*)((char*)dst + glyph.rowBytes());
                    src += dstBitmap.rowBytes();
                }
            }

        } break;

        default:
            SkDEBUGFAIL("unknown glyph format");
            memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight);
            return;
    }

// We used to always do this pre-USE_COLOR_LUMINANCE, but with colorlum,
// it is optional
#if defined(SK_GAMMA_APPLY_TO_A8)
    if (SkMask::kA8_Format == glyph.fMaskFormat && fPreBlend.isApplicable()) {
        uint8_t* SK_RESTRICT dst = (uint8_t*)glyph.fImage;
        unsigned rowBytes = glyph.rowBytes();

        for (int y = glyph.fHeight - 1; y >= 0; --y) {
            for (int x = glyph.fWidth - 1; x >= 0; --x) {
                dst[x] = fPreBlend.fG[dst[x]];
            }
            dst += rowBytes;
        }
    }
#endif
}