C++ SkGlyph::getSubXFixed方法代码示例

void GrTextUtils::BmpAppendGlyph(GrAtlasTextBlob* blob, int runIndex,
                                 GrBatchFontCache* fontCache,
                                 GrBatchTextStrike** strike, const SkGlyph& skGlyph,
                                 int vx, int vy, GrColor color, GrFontScaler* scaler) {
    if (!*strike) {
        *strike = fontCache->getStrike(scaler);
    }

    GrGlyph::PackedID id = GrGlyph::Pack(skGlyph.getGlyphID(),
                                         skGlyph.getSubXFixed(),
                                         skGlyph.getSubYFixed(),
                                         GrGlyph::kCoverage_MaskStyle);
    GrGlyph* glyph = (*strike)->getGlyph(skGlyph, id, scaler);
    if (!glyph) {
        return;
    }

    int x = vx + glyph->fBounds.fLeft;
    int y = vy + glyph->fBounds.fTop;

    // keep them as ints until we've done the clip-test
    int width = glyph->fBounds.width();
    int height = glyph->fBounds.height();

    SkRect r;
    r.fLeft = SkIntToScalar(x);
    r.fTop = SkIntToScalar(y);
    r.fRight = r.fLeft + SkIntToScalar(width);
    r.fBottom = r.fTop + SkIntToScalar(height);

    blob->appendGlyph(runIndex, r, color, *strike, glyph, scaler, skGlyph,
                      SkIntToScalar(vx), SkIntToScalar(vy), 1.0f, false);
}

bool GrTextUtils::DfAppendGlyph(GrAtlasTextBlob* blob, int runIndex, GrBatchFontCache* cache,
                                GrBatchTextStrike** strike, const SkGlyph& skGlyph,
                                SkScalar sx, SkScalar sy, GrColor color,
                                GrFontScaler* scaler,
                                SkScalar textRatio, const SkMatrix& viewMatrix) {
    if (!*strike) {
        *strike = cache->getStrike(scaler);
    }

    GrGlyph::PackedID id = GrGlyph::Pack(skGlyph.getGlyphID(),
                                         skGlyph.getSubXFixed(),
                                         skGlyph.getSubYFixed(),
                                         GrGlyph::kDistance_MaskStyle);
    GrGlyph* glyph = (*strike)->getGlyph(skGlyph, id, scaler);
    if (!glyph) {
        return true;
    }

    // fallback to color glyph support
    if (kA8_GrMaskFormat != glyph->fMaskFormat) {
        return false;
    }

    SkScalar dx = SkIntToScalar(glyph->fBounds.fLeft + SK_DistanceFieldInset);
    SkScalar dy = SkIntToScalar(glyph->fBounds.fTop + SK_DistanceFieldInset);
    SkScalar width = SkIntToScalar(glyph->fBounds.width() - 2 * SK_DistanceFieldInset);
    SkScalar height = SkIntToScalar(glyph->fBounds.height() - 2 * SK_DistanceFieldInset);

    SkScalar scale = textRatio;
    dx *= scale;
    dy *= scale;
    width *= scale;
    height *= scale;
    sx += dx;
    sy += dy;
    SkRect glyphRect = SkRect::MakeXYWH(sx, sy, width, height);

    blob->appendGlyph(runIndex, glyphRect, color, *strike, glyph, scaler, skGlyph,
                      sx - dx, sy - dy, scale, true);
    return true;
}

void SkScalerContext::internalGetPath(const SkGlyph& glyph, SkPath* fillPath,
                                  SkPath* devPath, SkMatrix* fillToDevMatrix) {
    SkPath  path;

    this->getGlyphContext(glyph)->generatePath(glyph, &path);

    if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) {
        SkFixed dx = glyph.getSubXFixed();
        SkFixed dy = glyph.getSubYFixed();
        if (dx | dy) {
            path.offset(SkFixedToScalar(dx), SkFixedToScalar(dy));
        }
    }

    if (fRec.fFrameWidth > 0 || fPathEffect != NULL) {
        // need the path in user-space, with only the point-size applied
        // so that our stroking and effects will operate the same way they
        // would if the user had extracted the path themself, and then
        // called drawPath
        SkPath      localPath;
        SkMatrix    matrix, inverse;

        fRec.getMatrixFrom2x2(&matrix);
        matrix.invert(&inverse);
        path.transform(inverse, &localPath);
        // now localPath is only affected by the paint settings, and not the canvas matrix

        SkScalar width = fRec.fFrameWidth;

        if (fPathEffect) {
            SkPath effectPath;

            if (fPathEffect->filterPath(&effectPath, localPath, &width)) {
                localPath.swap(effectPath);
            }
        }

        if (width > 0) {
            SkStroke    stroker;
            SkPath      outline;

            stroker.setWidth(width);
            stroker.setMiterLimit(fRec.fMiterLimit);
            stroker.setJoin((SkPaint::Join)fRec.fStrokeJoin);
            stroker.setDoFill(SkToBool(fRec.fFlags & kFrameAndFill_Flag));
            stroker.strokePath(localPath, &outline);
            localPath.swap(outline);
        }

        // now return stuff to the caller
        if (fillToDevMatrix) {
            *fillToDevMatrix = matrix;
        }
        if (devPath) {
            localPath.transform(matrix, devPath);
        }
        if (fillPath) {
            fillPath->swap(localPath);
        }
    } else {   // nothing tricky to do
        if (fillToDevMatrix) {
            fillToDevMatrix->reset();
        }
        if (devPath) {
            if (fillPath == NULL) {
                devPath->swap(path);
            } else {
                *devPath = path;
            }
        }

        if (fillPath) {
            fillPath->swap(path);
        }
    }

    if (devPath) {
        devPath->updateBoundsCache();
    }
    if (fillPath) {
        fillPath->updateBoundsCache();
    }
}

void SkScalerContext::internalGetPath(const SkGlyph& glyph, SkPath* fillPath,
                                  SkPath* devPath, SkMatrix* fillToDevMatrix) {
    SkPath  path;
    generatePath(glyph, &path);

    if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) {
        SkFixed dx = glyph.getSubXFixed();
        SkFixed dy = glyph.getSubYFixed();
        if (dx | dy) {
            path.offset(SkFixedToScalar(dx), SkFixedToScalar(dy));
        }
    }

    if (fRec.fFrameWidth > 0 || fPathEffect != nullptr) {
        // need the path in user-space, with only the point-size applied
        // so that our stroking and effects will operate the same way they
        // would if the user had extracted the path themself, and then
        // called drawPath
        SkPath      localPath;
        SkMatrix    matrix, inverse;

        fRec.getMatrixFrom2x2(&matrix);
        if (!matrix.invert(&inverse)) {
            // assume fillPath and devPath are already empty.
            return;
        }
        path.transform(inverse, &localPath);
        // now localPath is only affected by the paint settings, and not the canvas matrix

        SkStrokeRec rec(SkStrokeRec::kFill_InitStyle);

        if (fRec.fFrameWidth > 0) {
            rec.setStrokeStyle(fRec.fFrameWidth,
                               SkToBool(fRec.fFlags & kFrameAndFill_Flag));
            // glyphs are always closed contours, so cap type is ignored,
            // so we just pass something.
            rec.setStrokeParams((SkPaint::Cap)fRec.fStrokeCap,
                                (SkPaint::Join)fRec.fStrokeJoin,
                                fRec.fMiterLimit);
        }

        if (fPathEffect) {
            SkPath effectPath;
            if (fPathEffect->filterPath(&effectPath, localPath, &rec, nullptr)) {
                localPath.swap(effectPath);
            }
        }

        if (rec.needToApply()) {
            SkPath strokePath;
            if (rec.applyToPath(&strokePath, localPath)) {
                localPath.swap(strokePath);
            }
        }

        // now return stuff to the caller
        if (fillToDevMatrix) {
            *fillToDevMatrix = matrix;
        }
        if (devPath) {
            localPath.transform(matrix, devPath);
        }
        if (fillPath) {
            fillPath->swap(localPath);
        }
    } else {   // nothing tricky to do
        if (fillToDevMatrix) {
            fillToDevMatrix->reset();
        }
        if (devPath) {
            if (fillPath == nullptr) {
                devPath->swap(path);
            } else {
                *devPath = path;
            }
        }

        if (fillPath) {
            fillPath->swap(path);
        }
    }

    if (devPath) {
        devPath->updateBoundsCache();
    }
    if (fillPath) {
        fillPath->updateBoundsCache();
    }
}

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);
                /*
//.........这里部分代码省略.........

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;
//.........这里部分代码省略.........

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();
//.........这里部分代码省略.........