| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "src/svg/SkSVGDevice.h" |
| |
| #include "include/core/SkBitmap.h" |
| #include "include/core/SkBlendMode.h" |
| #include "include/core/SkClipOp.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkColorFilter.h" |
| #include "include/core/SkData.h" |
| #include "include/core/SkEncodedImageFormat.h" |
| #include "include/core/SkFont.h" |
| #include "include/core/SkFontStyle.h" |
| #include "include/core/SkImage.h" |
| #include "include/core/SkImageEncoder.h" |
| #include "include/core/SkImageInfo.h" |
| #include "include/core/SkMatrix.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPath.h" |
| #include "include/core/SkPathBuilder.h" |
| #include "include/core/SkPathEffect.h" |
| #include "include/core/SkPathTypes.h" |
| #include "include/core/SkPathUtils.h" |
| #include "include/core/SkPoint.h" |
| #include "include/core/SkRRect.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkShader.h" |
| #include "include/core/SkSize.h" |
| #include "include/core/SkSpan.h" |
| #include "include/core/SkStream.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkSurfaceProps.h" |
| #include "include/core/SkTileMode.h" |
| #include "include/core/SkTypeface.h" |
| #include "include/private/base/SkDebug.h" |
| #include "include/private/base/SkNoncopyable.h" |
| #include "include/private/base/SkTPin.h" |
| #include "include/private/base/SkTemplates.h" |
| #include "include/private/base/SkTo.h" |
| #include "include/svg/SkSVGCanvas.h" |
| #include "include/utils/SkBase64.h" |
| #include "src/base/SkTLazy.h" |
| #include "src/core/SkAnnotationKeys.h" |
| #include "src/core/SkClipStack.h" |
| #include "src/core/SkDevice.h" |
| #include "src/core/SkFontPriv.h" |
| #include "src/core/SkTHash.h" |
| #include "src/image/SkImage_Base.h" |
| #include "src/shaders/SkShaderBase.h" |
| #include "src/text/GlyphRun.h" |
| #include "src/xml/SkXMLWriter.h" |
| |
| #include <cstring> |
| #include <memory> |
| #include <string> |
| #include <utility> |
| |
| using namespace skia_private; |
| |
| #if defined(SK_GANESH) |
| class SkMesh; |
| #endif |
| class SkBlender; |
| class SkVertices; |
| struct SkSamplingOptions; |
| |
| #ifdef SK_CODEC_DECODES_JPEG |
| #include "src/codec/SkJpegCodec.h" |
| #endif |
| |
| namespace { |
| |
| static SkString svg_color(SkColor color) { |
| // https://www.w3.org/TR/css-color-3/#html4 |
| auto named_color = [](SkColor c) -> const char* { |
| switch (c & 0xffffff) { |
| case 0x000000: return "black"; |
| case 0x000080: return "navy"; |
| case 0x0000ff: return "blue"; |
| case 0x008000: return "green"; |
| case 0x008080: return "teal"; |
| case 0x00ff00: return "lime"; |
| case 0x00ffff: return "aqua"; |
| case 0x800000: return "maroon"; |
| case 0x800080: return "purple"; |
| case 0x808000: return "olive"; |
| case 0x808080: return "gray"; |
| case 0xc0c0c0: return "silver"; |
| case 0xff0000: return "red"; |
| case 0xff00ff: return "fuchsia"; |
| case 0xffff00: return "yellow"; |
| case 0xffffff: return "white"; |
| default: break; |
| } |
| |
| return nullptr; |
| }; |
| |
| if (const auto* nc = named_color(color)) { |
| return SkString(nc); |
| } |
| |
| uint8_t r = SkColorGetR(color); |
| uint8_t g = SkColorGetG(color); |
| uint8_t b = SkColorGetB(color); |
| |
| // Some users care about every byte here, so we'll use hex colors with single-digit channels |
| // when possible. |
| uint8_t rh = r >> 4; |
| uint8_t rl = r & 0xf; |
| uint8_t gh = g >> 4; |
| uint8_t gl = g & 0xf; |
| uint8_t bh = b >> 4; |
| uint8_t bl = b & 0xf; |
| if ((rh == rl) && (gh == gl) && (bh == bl)) { |
| return SkStringPrintf("#%1X%1X%1X", rh, gh, bh); |
| } |
| |
| return SkStringPrintf("#%02X%02X%02X", r, g, b); |
| } |
| |
| static SkScalar svg_opacity(SkColor color) { |
| return SkIntToScalar(SkColorGetA(color)) / SK_AlphaOPAQUE; |
| } |
| |
| // Keep in sync with SkPaint::Cap |
| static const char* cap_map[] = { |
| nullptr, // kButt_Cap (default) |
| "round", // kRound_Cap |
| "square" // kSquare_Cap |
| }; |
| static_assert(std::size(cap_map) == SkPaint::kCapCount, "missing_cap_map_entry"); |
| |
| static const char* svg_cap(SkPaint::Cap cap) { |
| SkASSERT(static_cast<size_t>(cap) < std::size(cap_map)); |
| return cap_map[cap]; |
| } |
| |
| // Keep in sync with SkPaint::Join |
| static const char* join_map[] = { |
| nullptr, // kMiter_Join (default) |
| "round", // kRound_Join |
| "bevel" // kBevel_Join |
| }; |
| static_assert(std::size(join_map) == SkPaint::kJoinCount, "missing_join_map_entry"); |
| |
| static const char* svg_join(SkPaint::Join join) { |
| SkASSERT(join < std::size(join_map)); |
| return join_map[join]; |
| } |
| |
| static SkString svg_transform(const SkMatrix& t) { |
| SkASSERT(!t.isIdentity()); |
| |
| SkString tstr; |
| switch (t.getType()) { |
| case SkMatrix::kPerspective_Mask: |
| // TODO: handle perspective matrices? |
| break; |
| case SkMatrix::kTranslate_Mask: |
| tstr.printf("translate(%g %g)", t.getTranslateX(), t.getTranslateY()); |
| break; |
| case SkMatrix::kScale_Mask: |
| tstr.printf("scale(%g %g)", t.getScaleX(), t.getScaleY()); |
| break; |
| default: |
| // http://www.w3.org/TR/SVG/coords.html#TransformMatrixDefined |
| // | a c e | |
| // | b d f | |
| // | 0 0 1 | |
| tstr.printf("matrix(%g %g %g %g %g %g)", |
| t.getScaleX(), t.getSkewY(), |
| t.getSkewX(), t.getScaleY(), |
| t.getTranslateX(), t.getTranslateY()); |
| break; |
| } |
| |
| return tstr; |
| } |
| |
| struct Resources { |
| Resources(const SkPaint& paint) |
| : fPaintServer(svg_color(paint.getColor())) {} |
| |
| SkString fPaintServer; |
| SkString fColorFilter; |
| }; |
| |
| // Determine if the paint requires us to reset the viewport. |
| // Currently, we do this whenever the paint shader calls |
| // for a repeating image. |
| bool RequiresViewportReset(const SkPaint& paint) { |
| SkShader* shader = paint.getShader(); |
| if (!shader) |
| return false; |
| |
| SkTileMode xy[2]; |
| SkImage* image = shader->isAImage(nullptr, xy); |
| |
| if (!image) |
| return false; |
| |
| for (int i = 0; i < 2; i++) { |
| if (xy[i] == SkTileMode::kRepeat) |
| return true; |
| } |
| return false; |
| } |
| |
| void AddPath(const sktext::GlyphRun& glyphRun, const SkPoint& offset, SkPath* path) { |
| struct Rec { |
| SkPath* fPath; |
| const SkPoint fOffset; |
| const SkPoint* fPos; |
| } rec = { path, offset, glyphRun.positions().data() }; |
| |
| glyphRun.font().getPaths(glyphRun.glyphsIDs().data(), SkToInt(glyphRun.glyphsIDs().size()), |
| [](const SkPath* path, const SkMatrix& mx, void* ctx) { |
| Rec* rec = reinterpret_cast<Rec*>(ctx); |
| if (path) { |
| SkMatrix total = mx; |
| total.postTranslate(rec->fPos->fX + rec->fOffset.fX, |
| rec->fPos->fY + rec->fOffset.fY); |
| rec->fPath->addPath(*path, total); |
| } else { |
| // TODO: this is going to drop color emojis. |
| } |
| rec->fPos += 1; // move to the next glyph's position |
| }, &rec); |
| } |
| |
| } // namespace |
| |
| // For now all this does is serve unique serial IDs, but it will eventually evolve to track |
| // and deduplicate resources. |
| class SkSVGDevice::ResourceBucket : ::SkNoncopyable { |
| public: |
| ResourceBucket() |
| : fGradientCount(0) |
| , fPathCount(0) |
| , fImageCount(0) |
| , fPatternCount(0) |
| , fColorFilterCount(0) {} |
| |
| SkString addLinearGradient() { |
| return SkStringPrintf("gradient_%d", fGradientCount++); |
| } |
| |
| SkString addPath() { |
| return SkStringPrintf("path_%d", fPathCount++); |
| } |
| |
| SkString addImage() { |
| return SkStringPrintf("img_%d", fImageCount++); |
| } |
| |
| SkString addColorFilter() { return SkStringPrintf("cfilter_%d", fColorFilterCount++); } |
| |
| SkString addPattern() { |
| return SkStringPrintf("pattern_%d", fPatternCount++); |
| } |
| |
| private: |
| uint32_t fGradientCount; |
| uint32_t fPathCount; |
| uint32_t fImageCount; |
| uint32_t fPatternCount; |
| uint32_t fColorFilterCount; |
| }; |
| |
| struct SkSVGDevice::MxCp { |
| const SkMatrix* fMatrix; |
| const SkClipStack* fClipStack; |
| |
| MxCp(const SkMatrix* mx, const SkClipStack* cs) : fMatrix(mx), fClipStack(cs) {} |
| MxCp(SkSVGDevice* device) : fMatrix(&device->localToDevice()), fClipStack(&device->cs()) {} |
| }; |
| |
| class SkSVGDevice::AutoElement : ::SkNoncopyable { |
| public: |
| AutoElement(const char name[], SkXMLWriter* writer) |
| : fWriter(writer) |
| , fResourceBucket(nullptr) { |
| fWriter->startElement(name); |
| } |
| |
| AutoElement(const char name[], const std::unique_ptr<SkXMLWriter>& writer) |
| : AutoElement(name, writer.get()) {} |
| |
| AutoElement(const char name[], SkSVGDevice* svgdev, |
| ResourceBucket* bucket, const MxCp& mc, const SkPaint& paint) |
| : fWriter(svgdev->fWriter.get()) |
| , fResourceBucket(bucket) { |
| |
| svgdev->syncClipStack(*mc.fClipStack); |
| Resources res = this->addResources(mc, paint); |
| |
| fWriter->startElement(name); |
| |
| this->addPaint(paint, res); |
| |
| if (!mc.fMatrix->isIdentity()) { |
| this->addAttribute("transform", svg_transform(*mc.fMatrix)); |
| } |
| } |
| |
| ~AutoElement() { |
| fWriter->endElement(); |
| } |
| |
| void addAttribute(const char name[], const char val[]) { |
| fWriter->addAttribute(name, val); |
| } |
| |
| void addAttribute(const char name[], const SkString& val) { |
| fWriter->addAttribute(name, val.c_str()); |
| } |
| |
| void addAttribute(const char name[], int32_t val) { |
| fWriter->addS32Attribute(name, val); |
| } |
| |
| void addAttribute(const char name[], SkScalar val) { |
| fWriter->addScalarAttribute(name, val); |
| } |
| |
| void addText(const SkString& text) { |
| fWriter->addText(text.c_str(), text.size()); |
| } |
| |
| void addRectAttributes(const SkRect&); |
| void addPathAttributes(const SkPath&, SkParsePath::PathEncoding); |
| void addTextAttributes(const SkFont&); |
| |
| private: |
| Resources addResources(const MxCp&, const SkPaint& paint); |
| void addShaderResources(const SkPaint& paint, Resources* resources); |
| void addGradientShaderResources(const SkShader* shader, const SkPaint& paint, |
| Resources* resources); |
| void addColorFilterResources(const SkColorFilter& cf, Resources* resources); |
| void addImageShaderResources(const SkShader* shader, const SkPaint& paint, |
| Resources* resources); |
| |
| void addPatternDef(const SkBitmap& bm); |
| |
| void addPaint(const SkPaint& paint, const Resources& resources); |
| |
| SkString addLinearGradientDef(const SkShaderBase::GradientInfo& info, |
| const SkShader* shader, |
| const SkMatrix& localMatrix); |
| |
| SkXMLWriter* fWriter; |
| ResourceBucket* fResourceBucket; |
| }; |
| |
| void SkSVGDevice::AutoElement::addPaint(const SkPaint& paint, const Resources& resources) { |
| // Path effects are applied to all vector graphics (rects, rrects, ovals, |
| // paths etc). This should only happen when a path effect is attached to |
| // non-vector graphics (text, image) or a new vector graphics primitive is |
| //added that is not handled by base drawPath() routine. |
| if (paint.getPathEffect() != nullptr) { |
| SkDebugf("Unsupported path effect in addPaint."); |
| } |
| SkPaint::Style style = paint.getStyle(); |
| if (style == SkPaint::kFill_Style || style == SkPaint::kStrokeAndFill_Style) { |
| static constexpr char kDefaultFill[] = "black"; |
| if (!resources.fPaintServer.equals(kDefaultFill)) { |
| this->addAttribute("fill", resources.fPaintServer); |
| |
| if (SK_AlphaOPAQUE != SkColorGetA(paint.getColor())) { |
| this->addAttribute("fill-opacity", svg_opacity(paint.getColor())); |
| } |
| } |
| } else { |
| SkASSERT(style == SkPaint::kStroke_Style); |
| this->addAttribute("fill", "none"); |
| } |
| |
| if (!resources.fColorFilter.isEmpty()) { |
| this->addAttribute("filter", resources.fColorFilter.c_str()); |
| } |
| |
| if (style == SkPaint::kStroke_Style || style == SkPaint::kStrokeAndFill_Style) { |
| this->addAttribute("stroke", resources.fPaintServer); |
| |
| SkScalar strokeWidth = paint.getStrokeWidth(); |
| if (strokeWidth == 0) { |
| // Hairline stroke |
| strokeWidth = 1; |
| this->addAttribute("vector-effect", "non-scaling-stroke"); |
| } |
| this->addAttribute("stroke-width", strokeWidth); |
| |
| if (const char* cap = svg_cap(paint.getStrokeCap())) { |
| this->addAttribute("stroke-linecap", cap); |
| } |
| |
| if (const char* join = svg_join(paint.getStrokeJoin())) { |
| this->addAttribute("stroke-linejoin", join); |
| } |
| |
| if (paint.getStrokeJoin() == SkPaint::kMiter_Join) { |
| this->addAttribute("stroke-miterlimit", paint.getStrokeMiter()); |
| } |
| |
| if (SK_AlphaOPAQUE != SkColorGetA(paint.getColor())) { |
| this->addAttribute("stroke-opacity", svg_opacity(paint.getColor())); |
| } |
| } else { |
| SkASSERT(style == SkPaint::kFill_Style); |
| // SVG default stroke value is "none". |
| } |
| } |
| |
| Resources SkSVGDevice::AutoElement::addResources(const MxCp& mc, const SkPaint& paint) { |
| Resources resources(paint); |
| |
| if (paint.getShader()) { |
| AutoElement defs("defs", fWriter); |
| |
| this->addShaderResources(paint, &resources); |
| } |
| |
| if (const SkColorFilter* cf = paint.getColorFilter()) { |
| // TODO: Implement skia color filters for blend modes other than SrcIn |
| SkBlendMode mode; |
| if (cf->asAColorMode(nullptr, &mode) && mode == SkBlendMode::kSrcIn) { |
| this->addColorFilterResources(*cf, &resources); |
| } |
| } |
| |
| return resources; |
| } |
| |
| void SkSVGDevice::AutoElement::addGradientShaderResources(const SkShader* shader, |
| const SkPaint& paint, |
| Resources* resources) { |
| SkShaderBase::GradientInfo grInfo; |
| const auto gradient_type = as_SB(shader)->asGradient(&grInfo); |
| |
| if (gradient_type != SkShaderBase::GradientType::kColor && |
| gradient_type != SkShaderBase::GradientType::kLinear) { |
| // TODO: other gradient support |
| return; |
| } |
| |
| AutoSTArray<16, SkColor> grColors(grInfo.fColorCount); |
| AutoSTArray<16, SkScalar> grOffsets(grInfo.fColorCount); |
| grInfo.fColors = grColors.get(); |
| grInfo.fColorOffsets = grOffsets.get(); |
| |
| // One more call to get the actual colors/offsets and local matrix. |
| SkMatrix localMatrix; |
| as_SB(shader)->asGradient(&grInfo, &localMatrix); |
| SkASSERT(grInfo.fColorCount <= grColors.count()); |
| SkASSERT(grInfo.fColorCount <= grOffsets.count()); |
| |
| SkASSERT(grColors.size() > 0); |
| resources->fPaintServer = gradient_type == SkShaderBase::GradientType::kColor |
| ? svg_color(grColors[0]) |
| : SkStringPrintf("url(#%s)", addLinearGradientDef(grInfo, shader, localMatrix).c_str()); |
| } |
| |
| void SkSVGDevice::AutoElement::addColorFilterResources(const SkColorFilter& cf, |
| Resources* resources) { |
| SkString colorfilterID = fResourceBucket->addColorFilter(); |
| { |
| AutoElement filterElement("filter", fWriter); |
| filterElement.addAttribute("id", colorfilterID); |
| filterElement.addAttribute("x", "0%"); |
| filterElement.addAttribute("y", "0%"); |
| filterElement.addAttribute("width", "100%"); |
| filterElement.addAttribute("height", "100%"); |
| |
| SkColor filterColor; |
| SkBlendMode mode; |
| bool asAColorMode = cf.asAColorMode(&filterColor, &mode); |
| SkAssertResult(asAColorMode); |
| SkASSERT(mode == SkBlendMode::kSrcIn); |
| |
| { |
| // first flood with filter color |
| AutoElement floodElement("feFlood", fWriter); |
| floodElement.addAttribute("flood-color", svg_color(filterColor)); |
| floodElement.addAttribute("flood-opacity", svg_opacity(filterColor)); |
| floodElement.addAttribute("result", "flood"); |
| } |
| |
| { |
| // apply the transform to filter color |
| AutoElement compositeElement("feComposite", fWriter); |
| compositeElement.addAttribute("in", "flood"); |
| compositeElement.addAttribute("operator", "in"); |
| } |
| } |
| resources->fColorFilter.printf("url(#%s)", colorfilterID.c_str()); |
| } |
| |
| namespace { |
| bool is_png(const void* bytes, size_t length) { |
| constexpr uint8_t kPngSig[] = { 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A }; |
| return length >= sizeof(kPngSig) && !memcmp(bytes, kPngSig, sizeof(kPngSig)); |
| } |
| } // namespace |
| |
| // Returns data uri from bytes. |
| // it will use any cached data if available, otherwise will |
| // encode as png. |
| sk_sp<SkData> AsDataUri(SkImage* image) { |
| sk_sp<SkData> imageData = image->encodeToData(); |
| if (!imageData) { |
| return nullptr; |
| } |
| |
| const char* selectedPrefix = nullptr; |
| size_t selectedPrefixLength = 0; |
| |
| #ifdef SK_CODEC_DECODES_JPEG |
| if (SkJpegCodec::IsJpeg(imageData->data(), imageData->size())) { |
| const static char jpgDataPrefix[] = "data:image/jpeg;base64,"; |
| selectedPrefix = jpgDataPrefix; |
| selectedPrefixLength = sizeof(jpgDataPrefix); |
| } |
| else |
| #endif |
| { |
| if (!is_png(imageData->data(), imageData->size())) { |
| #ifdef SK_ENCODE_PNG |
| imageData = image->encodeToData(SkEncodedImageFormat::kPNG, 100); |
| #else |
| return nullptr; |
| #endif |
| } |
| const static char pngDataPrefix[] = "data:image/png;base64,"; |
| selectedPrefix = pngDataPrefix; |
| selectedPrefixLength = sizeof(pngDataPrefix); |
| } |
| |
| size_t b64Size = SkBase64::Encode(imageData->data(), imageData->size(), nullptr); |
| sk_sp<SkData> dataUri = SkData::MakeUninitialized(selectedPrefixLength + b64Size); |
| char* dest = (char*)dataUri->writable_data(); |
| memcpy(dest, selectedPrefix, selectedPrefixLength); |
| SkBase64::Encode(imageData->data(), imageData->size(), dest + selectedPrefixLength - 1); |
| dest[dataUri->size() - 1] = 0; |
| return dataUri; |
| } |
| |
| void SkSVGDevice::AutoElement::addImageShaderResources(const SkShader* shader, const SkPaint& paint, |
| Resources* resources) { |
| SkMatrix outMatrix; |
| |
| SkTileMode xy[2]; |
| SkImage* image = shader->isAImage(&outMatrix, xy); |
| SkASSERT(image); |
| |
| SkString patternDims[2]; // width, height |
| |
| sk_sp<SkData> dataUri = AsDataUri(image); |
| if (!dataUri) { |
| return; |
| } |
| SkIRect imageSize = image->bounds(); |
| for (int i = 0; i < 2; i++) { |
| int imageDimension = i == 0 ? imageSize.width() : imageSize.height(); |
| switch (xy[i]) { |
| case SkTileMode::kRepeat: |
| patternDims[i].appendScalar(imageDimension); |
| break; |
| default: |
| // TODO: other tile modes? |
| patternDims[i] = "100%"; |
| } |
| } |
| |
| SkString patternID = fResourceBucket->addPattern(); |
| { |
| AutoElement pattern("pattern", fWriter); |
| pattern.addAttribute("id", patternID); |
| pattern.addAttribute("patternUnits", "userSpaceOnUse"); |
| pattern.addAttribute("patternContentUnits", "userSpaceOnUse"); |
| pattern.addAttribute("width", patternDims[0]); |
| pattern.addAttribute("height", patternDims[1]); |
| pattern.addAttribute("x", 0); |
| pattern.addAttribute("y", 0); |
| |
| { |
| SkString imageID = fResourceBucket->addImage(); |
| AutoElement imageTag("image", fWriter); |
| imageTag.addAttribute("id", imageID); |
| imageTag.addAttribute("x", 0); |
| imageTag.addAttribute("y", 0); |
| imageTag.addAttribute("width", image->width()); |
| imageTag.addAttribute("height", image->height()); |
| imageTag.addAttribute("xlink:href", static_cast<const char*>(dataUri->data())); |
| } |
| } |
| resources->fPaintServer.printf("url(#%s)", patternID.c_str()); |
| } |
| |
| void SkSVGDevice::AutoElement::addShaderResources(const SkPaint& paint, Resources* resources) { |
| const SkShader* shader = paint.getShader(); |
| SkASSERT(shader); |
| |
| if (as_SB(shader)->asGradient() != SkShaderBase::GradientType::kNone) { |
| this->addGradientShaderResources(shader, paint, resources); |
| } else if (shader->isAImage()) { |
| this->addImageShaderResources(shader, paint, resources); |
| } |
| // TODO: other shader types? |
| } |
| |
| SkString SkSVGDevice::AutoElement::addLinearGradientDef(const SkShaderBase::GradientInfo& info, |
| const SkShader* shader, |
| const SkMatrix& localMatrix) { |
| SkASSERT(fResourceBucket); |
| SkString id = fResourceBucket->addLinearGradient(); |
| |
| { |
| AutoElement gradient("linearGradient", fWriter); |
| |
| gradient.addAttribute("id", id); |
| gradient.addAttribute("gradientUnits", "userSpaceOnUse"); |
| gradient.addAttribute("x1", info.fPoint[0].x()); |
| gradient.addAttribute("y1", info.fPoint[0].y()); |
| gradient.addAttribute("x2", info.fPoint[1].x()); |
| gradient.addAttribute("y2", info.fPoint[1].y()); |
| |
| if (!localMatrix.isIdentity()) { |
| this->addAttribute("gradientTransform", svg_transform(localMatrix)); |
| } |
| |
| SkASSERT(info.fColorCount >= 2); |
| for (int i = 0; i < info.fColorCount; ++i) { |
| SkColor color = info.fColors[i]; |
| SkString colorStr(svg_color(color)); |
| |
| { |
| AutoElement stop("stop", fWriter); |
| stop.addAttribute("offset", info.fColorOffsets[i]); |
| stop.addAttribute("stop-color", colorStr.c_str()); |
| |
| if (SK_AlphaOPAQUE != SkColorGetA(color)) { |
| stop.addAttribute("stop-opacity", svg_opacity(color)); |
| } |
| } |
| } |
| } |
| |
| return id; |
| } |
| |
| void SkSVGDevice::AutoElement::addRectAttributes(const SkRect& rect) { |
| // x, y default to 0 |
| if (rect.x() != 0) { |
| this->addAttribute("x", rect.x()); |
| } |
| if (rect.y() != 0) { |
| this->addAttribute("y", rect.y()); |
| } |
| |
| this->addAttribute("width", rect.width()); |
| this->addAttribute("height", rect.height()); |
| } |
| |
| void SkSVGDevice::AutoElement::addPathAttributes(const SkPath& path, |
| SkParsePath::PathEncoding encoding) { |
| this->addAttribute("d", SkParsePath::ToSVGString(path, encoding)); |
| } |
| |
| void SkSVGDevice::AutoElement::addTextAttributes(const SkFont& font) { |
| this->addAttribute("font-size", font.getSize()); |
| |
| SkString familyName; |
| SkTHashSet<SkString> familySet; |
| sk_sp<SkTypeface> tface = font.refTypefaceOrDefault(); |
| |
| SkASSERT(tface); |
| SkFontStyle style = tface->fontStyle(); |
| if (style.slant() == SkFontStyle::kItalic_Slant) { |
| this->addAttribute("font-style", "italic"); |
| } else if (style.slant() == SkFontStyle::kOblique_Slant) { |
| this->addAttribute("font-style", "oblique"); |
| } |
| int weightIndex = (SkTPin(style.weight(), 100, 900) - 50) / 100; |
| if (weightIndex != 3) { |
| static constexpr const char* weights[] = { |
| "100", "200", "300", "normal", "400", "500", "600", "bold", "800", "900" |
| }; |
| this->addAttribute("font-weight", weights[weightIndex]); |
| } |
| int stretchIndex = style.width() - 1; |
| if (stretchIndex != 4) { |
| static constexpr const char* stretches[] = { |
| "ultra-condensed", "extra-condensed", "condensed", "semi-condensed", |
| "normal", |
| "semi-expanded", "expanded", "extra-expanded", "ultra-expanded" |
| }; |
| this->addAttribute("font-stretch", stretches[stretchIndex]); |
| } |
| |
| sk_sp<SkTypeface::LocalizedStrings> familyNameIter(tface->createFamilyNameIterator()); |
| SkTypeface::LocalizedString familyString; |
| if (familyNameIter) { |
| while (familyNameIter->next(&familyString)) { |
| if (familySet.contains(familyString.fString)) { |
| continue; |
| } |
| familySet.add(familyString.fString); |
| familyName.appendf((familyName.isEmpty() ? "%s" : ", %s"), familyString.fString.c_str()); |
| } |
| } |
| if (!familyName.isEmpty()) { |
| this->addAttribute("font-family", familyName); |
| } |
| } |
| |
| sk_sp<SkBaseDevice> SkSVGDevice::Make(const SkISize& size, std::unique_ptr<SkXMLWriter> writer, |
| uint32_t flags) { |
| return writer ? sk_sp<SkBaseDevice>(new SkSVGDevice(size, std::move(writer), flags)) |
| : nullptr; |
| } |
| |
| SkSVGDevice::SkSVGDevice(const SkISize& size, std::unique_ptr<SkXMLWriter> writer, uint32_t flags) |
| : INHERITED(SkImageInfo::MakeUnknown(size.fWidth, size.fHeight), |
| SkSurfaceProps(0, kUnknown_SkPixelGeometry)) |
| , fWriter(std::move(writer)) |
| , fResourceBucket(new ResourceBucket) |
| , fFlags(flags) |
| { |
| SkASSERT(fWriter); |
| |
| fWriter->writeHeader(); |
| |
| // The root <svg> tag gets closed by the destructor. |
| fRootElement = std::make_unique<AutoElement>("svg", fWriter); |
| |
| fRootElement->addAttribute("xmlns", "http://www.w3.org/2000/svg"); |
| fRootElement->addAttribute("xmlns:xlink", "http://www.w3.org/1999/xlink"); |
| fRootElement->addAttribute("width", size.width()); |
| fRootElement->addAttribute("height", size.height()); |
| } |
| |
| SkSVGDevice::~SkSVGDevice() { |
| // Pop order is important. |
| while (!fClipStack.empty()) { |
| fClipStack.pop_back(); |
| } |
| } |
| |
| SkParsePath::PathEncoding SkSVGDevice::pathEncoding() const { |
| return (fFlags & SkSVGCanvas::kRelativePathEncoding_Flag) |
| ? SkParsePath::PathEncoding::Relative |
| : SkParsePath::PathEncoding::Absolute; |
| } |
| |
| void SkSVGDevice::syncClipStack(const SkClipStack& cs) { |
| SkClipStack::B2TIter iter(cs); |
| |
| const SkClipStack::Element* elem; |
| int rec_idx = 0; |
| |
| // First, find/preserve the common bottom. |
| while ((elem = iter.next()) && (rec_idx < fClipStack.size())) { |
| if (fClipStack[SkToInt(rec_idx)].fGenID != elem->getGenID()) { |
| break; |
| } |
| rec_idx++; |
| } |
| |
| // Discard out-of-date stack top. |
| while (fClipStack.size() > rec_idx) { |
| fClipStack.pop_back(); |
| } |
| |
| auto define_clip = [this](const SkClipStack::Element* e) { |
| const auto cid = SkStringPrintf("cl_%x", e->getGenID()); |
| |
| AutoElement clip_path("clipPath", fWriter); |
| clip_path.addAttribute("id", cid); |
| |
| // TODO: handle non-intersect clips. |
| |
| switch (e->getDeviceSpaceType()) { |
| case SkClipStack::Element::DeviceSpaceType::kEmpty: { |
| // TODO: can we skip this? |
| AutoElement rect("rect", fWriter); |
| } break; |
| case SkClipStack::Element::DeviceSpaceType::kRect: { |
| AutoElement rect("rect", fWriter); |
| rect.addRectAttributes(e->getDeviceSpaceRect()); |
| } break; |
| case SkClipStack::Element::DeviceSpaceType::kRRect: { |
| // TODO: complex rrect handling? |
| const auto& rr = e->getDeviceSpaceRRect(); |
| const auto radii = rr.getSimpleRadii(); |
| |
| AutoElement rrect("rect", fWriter); |
| rrect.addRectAttributes(rr.rect()); |
| rrect.addAttribute("rx", radii.x()); |
| rrect.addAttribute("ry", radii.y()); |
| } break; |
| case SkClipStack::Element::DeviceSpaceType::kPath: { |
| const auto& p = e->getDeviceSpacePath(); |
| AutoElement path("path", fWriter); |
| path.addPathAttributes(p, this->pathEncoding()); |
| if (p.getFillType() == SkPathFillType::kEvenOdd) { |
| path.addAttribute("clip-rule", "evenodd"); |
| } |
| } break; |
| case SkClipStack::Element::DeviceSpaceType::kShader: |
| // TODO: handle shader clipping, perhaps rasterize and apply as a mask image? |
| break; |
| } |
| |
| return cid; |
| }; |
| |
| // Rebuild the top. |
| while (elem) { |
| const auto cid = define_clip(elem); |
| |
| auto clip_grp = std::make_unique<AutoElement>("g", fWriter); |
| clip_grp->addAttribute("clip-path", SkStringPrintf("url(#%s)", cid.c_str())); |
| |
| fClipStack.push_back({ std::move(clip_grp), elem->getGenID() }); |
| |
| elem = iter.next(); |
| } |
| } |
| |
| void SkSVGDevice::drawPaint(const SkPaint& paint) { |
| AutoElement rect("rect", this, fResourceBucket.get(), MxCp(this), paint); |
| rect.addRectAttributes(SkRect::MakeWH(SkIntToScalar(this->width()), |
| SkIntToScalar(this->height()))); |
| } |
| |
| void SkSVGDevice::drawAnnotation(const SkRect& rect, const char key[], SkData* value) { |
| if (!value) { |
| return; |
| } |
| |
| if (!strcmp(SkAnnotationKeys::URL_Key(), key) || |
| !strcmp(SkAnnotationKeys::Link_Named_Dest_Key(), key)) { |
| this->cs().save(); |
| this->cs().clipRect(rect, this->localToDevice(), SkClipOp::kIntersect, true); |
| SkRect transformedRect = this->cs().bounds(this->getGlobalBounds()); |
| this->cs().restore(); |
| if (transformedRect.isEmpty()) { |
| return; |
| } |
| |
| SkString url(static_cast<const char*>(value->data()), value->size() - 1); |
| AutoElement a("a", fWriter); |
| a.addAttribute("xlink:href", url.c_str()); |
| { |
| AutoElement r("rect", fWriter); |
| r.addAttribute("fill-opacity", "0.0"); |
| r.addRectAttributes(transformedRect); |
| } |
| } |
| } |
| |
| void SkSVGDevice::drawPoints(SkCanvas::PointMode mode, size_t count, |
| const SkPoint pts[], const SkPaint& paint) { |
| SkPathBuilder path; |
| |
| switch (mode) { |
| // todo |
| case SkCanvas::kPoints_PointMode: |
| // TODO? |
| break; |
| case SkCanvas::kLines_PointMode: |
| count -= 1; |
| for (size_t i = 0; i < count; i += 2) { |
| path.moveTo(pts[i]); |
| path.lineTo(pts[i+1]); |
| } |
| break; |
| case SkCanvas::kPolygon_PointMode: |
| if (count > 1) { |
| path.addPolygon(pts, SkToInt(count), false); |
| } |
| break; |
| } |
| |
| this->drawPath(path.detach(), paint, true); |
| } |
| |
| void SkSVGDevice::drawRect(const SkRect& r, const SkPaint& paint) { |
| std::unique_ptr<AutoElement> svg; |
| if (RequiresViewportReset(paint)) { |
| svg = std::make_unique<AutoElement>("svg", this, fResourceBucket.get(), MxCp(this), paint); |
| svg->addRectAttributes(r); |
| } |
| |
| AutoElement rect("rect", this, fResourceBucket.get(), MxCp(this), paint); |
| |
| if (svg) { |
| rect.addAttribute("x", 0); |
| rect.addAttribute("y", 0); |
| rect.addAttribute("width", "100%"); |
| rect.addAttribute("height", "100%"); |
| } else { |
| rect.addRectAttributes(r); |
| } |
| } |
| |
| void SkSVGDevice::drawOval(const SkRect& oval, const SkPaint& paint) { |
| AutoElement ellipse("ellipse", this, fResourceBucket.get(), MxCp(this), paint); |
| ellipse.addAttribute("cx", oval.centerX()); |
| ellipse.addAttribute("cy", oval.centerY()); |
| ellipse.addAttribute("rx", oval.width() / 2); |
| ellipse.addAttribute("ry", oval.height() / 2); |
| } |
| |
| void SkSVGDevice::drawRRect(const SkRRect& rr, const SkPaint& paint) { |
| AutoElement elem("path", this, fResourceBucket.get(), MxCp(this), paint); |
| elem.addPathAttributes(SkPath::RRect(rr), this->pathEncoding()); |
| } |
| |
| void SkSVGDevice::drawPath(const SkPath& path, const SkPaint& paint, bool pathIsMutable) { |
| if (path.isInverseFillType()) { |
| SkDebugf("Inverse path fill type not yet implemented."); |
| return; |
| } |
| |
| SkPath pathStorage; |
| SkPath* pathPtr = const_cast<SkPath*>(&path); |
| SkTCopyOnFirstWrite<SkPaint> path_paint(paint); |
| |
| // Apply path effect from paint to path. |
| if (path_paint->getPathEffect()) { |
| if (!pathIsMutable) { |
| pathPtr = &pathStorage; |
| } |
| bool fill = skpathutils::FillPathWithPaint(path, *path_paint, pathPtr); |
| if (fill) { |
| // Path should be filled. |
| path_paint.writable()->setStyle(SkPaint::kFill_Style); |
| } else { |
| // Path should be drawn with a hairline (width == 0). |
| path_paint.writable()->setStyle(SkPaint::kStroke_Style); |
| path_paint.writable()->setStrokeWidth(0); |
| } |
| |
| path_paint.writable()->setPathEffect(nullptr); // path effect processed |
| } |
| |
| // Create path element. |
| AutoElement elem("path", this, fResourceBucket.get(), MxCp(this), *path_paint); |
| elem.addPathAttributes(*pathPtr, this->pathEncoding()); |
| |
| // TODO: inverse fill types? |
| if (pathPtr->getFillType() == SkPathFillType::kEvenOdd) { |
| elem.addAttribute("fill-rule", "evenodd"); |
| } |
| } |
| |
| static sk_sp<SkData> encode(const SkBitmap& src) { |
| SkDynamicMemoryWStream buf; |
| return SkEncodeImage(&buf, src, SkEncodedImageFormat::kPNG, 80) ? buf.detachAsData() : nullptr; |
| } |
| |
| void SkSVGDevice::drawBitmapCommon(const MxCp& mc, const SkBitmap& bm, const SkPaint& paint) { |
| sk_sp<SkData> pngData = encode(bm); |
| if (!pngData) { |
| return; |
| } |
| |
| size_t b64Size = SkBase64::Encode(pngData->data(), pngData->size(), nullptr); |
| AutoTMalloc<char> b64Data(b64Size); |
| SkBase64::Encode(pngData->data(), pngData->size(), b64Data.get()); |
| |
| SkString svgImageData("data:image/png;base64,"); |
| svgImageData.append(b64Data.get(), b64Size); |
| |
| SkString imageID = fResourceBucket->addImage(); |
| { |
| AutoElement defs("defs", fWriter); |
| { |
| AutoElement image("image", fWriter); |
| image.addAttribute("id", imageID); |
| image.addAttribute("width", bm.width()); |
| image.addAttribute("height", bm.height()); |
| image.addAttribute("xlink:href", svgImageData); |
| } |
| } |
| |
| { |
| AutoElement imageUse("use", this, fResourceBucket.get(), mc, paint); |
| imageUse.addAttribute("xlink:href", SkStringPrintf("#%s", imageID.c_str())); |
| } |
| } |
| |
| void SkSVGDevice::drawImageRect(const SkImage* image, const SkRect* src, const SkRect& dst, |
| const SkSamplingOptions& sampling, const SkPaint& paint, |
| SkCanvas::SrcRectConstraint constraint) { |
| SkBitmap bm; |
| // TODO: support gpu images |
| if (!as_IB(image)->getROPixels(nullptr, &bm)) { |
| return; |
| } |
| |
| SkClipStack* cs = &this->cs(); |
| SkClipStack::AutoRestore ar(cs, false); |
| if (src && *src != SkRect::Make(bm.bounds())) { |
| cs->save(); |
| cs->clipRect(dst, this->localToDevice(), SkClipOp::kIntersect, paint.isAntiAlias()); |
| } |
| |
| SkMatrix adjustedMatrix = this->localToDevice() |
| * SkMatrix::RectToRect(src ? *src : SkRect::Make(bm.bounds()), dst); |
| |
| drawBitmapCommon(MxCp(&adjustedMatrix, cs), bm, paint); |
| } |
| |
| class SVGTextBuilder : SkNoncopyable { |
| public: |
| SVGTextBuilder(SkPoint origin, const sktext::GlyphRun& glyphRun) |
| : fOrigin(origin) { |
| auto runSize = glyphRun.runSize(); |
| AutoSTArray<64, SkUnichar> unichars(runSize); |
| SkFontPriv::GlyphsToUnichars(glyphRun.font(), glyphRun.glyphsIDs().data(), |
| runSize, unichars.get()); |
| auto positions = glyphRun.positions(); |
| for (size_t i = 0; i < runSize; ++i) { |
| this->appendUnichar(unichars[i], positions[i]); |
| } |
| } |
| |
| const SkString& text() const { return fText; } |
| const SkString& posX() const { return fPosXStr; } |
| const SkString& posY() const { return fHasConstY ? fConstYStr : fPosYStr; } |
| |
| private: |
| void appendUnichar(SkUnichar c, SkPoint position) { |
| bool discardPos = false; |
| bool isWhitespace = false; |
| |
| switch(c) { |
| case ' ': |
| case '\t': |
| // consolidate whitespace to match SVG's xml:space=default munging |
| // (http://www.w3.org/TR/SVG/text.html#WhiteSpace) |
| if (fLastCharWasWhitespace) { |
| discardPos = true; |
| } else { |
| fText.appendUnichar(c); |
| } |
| isWhitespace = true; |
| break; |
| case '\0': |
| // SkPaint::glyphsToUnichars() returns \0 for inconvertible glyphs, but these |
| // are not legal XML characters (http://www.w3.org/TR/REC-xml/#charsets) |
| discardPos = true; |
| isWhitespace = fLastCharWasWhitespace; // preserve whitespace consolidation |
| break; |
| case '&': |
| fText.append("&"); |
| break; |
| case '"': |
| fText.append("""); |
| break; |
| case '\'': |
| fText.append("'"); |
| break; |
| case '<': |
| fText.append("<"); |
| break; |
| case '>': |
| fText.append(">"); |
| break; |
| default: |
| fText.appendUnichar(c); |
| break; |
| } |
| |
| fLastCharWasWhitespace = isWhitespace; |
| |
| if (discardPos) { |
| return; |
| } |
| |
| position += fOrigin; |
| fPosXStr.appendf("%.8g, ", position.fX); |
| fPosYStr.appendf("%.8g, ", position.fY); |
| |
| if (fConstYStr.isEmpty()) { |
| fConstYStr = fPosYStr; |
| fConstY = position.fY; |
| } else { |
| fHasConstY &= SkScalarNearlyEqual(fConstY, position.fY); |
| } |
| } |
| |
| const SkPoint fOrigin; |
| |
| SkString fText, |
| fPosXStr, fPosYStr, |
| fConstYStr; |
| SkScalar fConstY; |
| bool fLastCharWasWhitespace = true, // start off in whitespace mode to strip leading space |
| fHasConstY = true; |
| }; |
| |
| void SkSVGDevice::onDrawGlyphRunList(SkCanvas* canvas, |
| const sktext::GlyphRunList& glyphRunList, |
| const SkPaint& initialPaint, |
| const SkPaint& drawingPaint) { |
| SkASSERT(!glyphRunList.hasRSXForm()); |
| const auto draw_as_path = (fFlags & SkSVGCanvas::kConvertTextToPaths_Flag) || |
| drawingPaint.getPathEffect(); |
| |
| if (draw_as_path) { |
| // Emit a single <path> element. |
| SkPath path; |
| for (auto& glyphRun : glyphRunList) { |
| AddPath(glyphRun, glyphRunList.origin(), &path); |
| } |
| |
| this->drawPath(path, drawingPaint); |
| |
| return; |
| } |
| |
| // Emit one <text> element for each run. |
| for (auto& glyphRun : glyphRunList) { |
| AutoElement elem("text", this, fResourceBucket.get(), MxCp(this), drawingPaint); |
| elem.addTextAttributes(glyphRun.font()); |
| |
| SVGTextBuilder builder(glyphRunList.origin(), glyphRun); |
| elem.addAttribute("x", builder.posX()); |
| elem.addAttribute("y", builder.posY()); |
| elem.addText(builder.text()); |
| } |
| } |
| |
| void SkSVGDevice::drawVertices(const SkVertices*, sk_sp<SkBlender>, const SkPaint&, bool) { |
| // todo |
| } |
| |
| #ifdef SK_ENABLE_SKSL |
| void SkSVGDevice::drawMesh(const SkMesh&, sk_sp<SkBlender>, const SkPaint&) { |
| // todo |
| } |
| #endif |