Beispiel #1
0
SkBitmapDevice* SkBitmapDevice::Create(const SkImageInfo& origInfo,
                                       const SkSurfaceProps& surfaceProps) {
    SkAlphaType newAT = origInfo.alphaType();
    if (!valid_for_bitmap_device(origInfo, &newAT)) {
        return nullptr;
    }

    const SkImageInfo info = origInfo.makeAlphaType(newAT);
    SkBitmap bitmap;

    if (kUnknown_SkColorType == info.colorType()) {
        if (!bitmap.setInfo(info)) {
            return nullptr;
        }
    } else if (info.isOpaque()) {
        // If this bitmap is opaque, we don't have any sensible default color,
        // so we just return uninitialized pixels.
        if (!bitmap.tryAllocPixels(info)) {
            return nullptr;
        }
    } else {
        // This bitmap has transparency, so we'll zero the pixels (to transparent).
        // We use a ZeroedPRFactory as a faster alloc-then-eraseColor(SK_ColorTRANSPARENT).
        SkMallocPixelRef::ZeroedPRFactory factory;
        if (!bitmap.tryAllocPixels(info, &factory, nullptr/*color table*/)) {
            return nullptr;
        }
    }

    return new SkBitmapDevice(bitmap, surfaceProps);
}
 bool allocHandle(const SkImageInfo& info, Rec* rec) override {
     SkASSERT(info.colorType() == kN32_SkColorType);
     return Create(info.width(), info.height(), info.isOpaque(), rec);
 }
Beispiel #3
0
bool SkJpegEncoderMgr::setParams(const SkImageInfo& srcInfo, const SkJpegEncoder::Options& options)
{
    auto chooseProc8888 = [&]() {
        if (kUnpremul_SkAlphaType != srcInfo.alphaType() ||
            SkJpegEncoder::AlphaOption::kIgnore == options.fAlphaOption)
        {
            return (transform_scanline_proc) nullptr;
        }

        // Note that kRespect mode is only supported with sRGB or linear transfer functions.
        // The legacy code path is incidentally correct when the transfer function is linear.
        const bool isSRGBTransferFn = srcInfo.gammaCloseToSRGB() &&
                (SkTransferFunctionBehavior::kRespect == options.fBlendBehavior);
        if (isSRGBTransferFn) {
            return transform_scanline_to_premul_linear;
        } else {
            return transform_scanline_to_premul_legacy;
        }
    };

    J_COLOR_SPACE jpegColorType = JCS_EXT_RGBA;
    int numComponents = 0;
    switch (srcInfo.colorType()) {
        case kRGBA_8888_SkColorType:
            fProc = chooseProc8888();
            jpegColorType = JCS_EXT_RGBA;
            numComponents = 4;
            break;
        case kBGRA_8888_SkColorType:
            fProc = chooseProc8888();
            jpegColorType = JCS_EXT_BGRA;
            numComponents = 4;
            break;
        case kRGB_565_SkColorType:
            fProc = transform_scanline_565;
            jpegColorType = JCS_RGB;
            numComponents = 3;
            break;
        case kARGB_4444_SkColorType:
            if (SkJpegEncoder::AlphaOption::kBlendOnBlack == options.fAlphaOption) {
                return false;
            }

            fProc = transform_scanline_444;
            jpegColorType = JCS_RGB;
            numComponents = 3;
            break;
        case kGray_8_SkColorType:
            SkASSERT(srcInfo.isOpaque());
            jpegColorType = JCS_GRAYSCALE;
            numComponents = 1;
            break;
        case kRGBA_F16_SkColorType:
            if (!srcInfo.colorSpace() || !srcInfo.colorSpace()->gammaIsLinear() ||
                    SkTransferFunctionBehavior::kRespect != options.fBlendBehavior) {
                return false;
            }

            if (kUnpremul_SkAlphaType != srcInfo.alphaType() ||
                SkJpegEncoder::AlphaOption::kIgnore == options.fAlphaOption)
            {
                fProc = transform_scanline_F16_to_8888;
            } else {
                fProc = transform_scanline_F16_to_premul_8888;
            }
            jpegColorType = JCS_EXT_RGBA;
            numComponents = 4;
            break;
        default:
            return false;
    }

    fCInfo.image_width = srcInfo.width();
    fCInfo.image_height = srcInfo.height();
    fCInfo.in_color_space = jpegColorType;
    fCInfo.input_components = numComponents;
    jpeg_set_defaults(&fCInfo);

    if (kGray_8_SkColorType != srcInfo.colorType()) {
        switch (options.fDownsample) {
            case SkJpegEncoder::Downsample::k420:
                SkASSERT(2 == fCInfo.comp_info[0].h_samp_factor);
                SkASSERT(2 == fCInfo.comp_info[0].v_samp_factor);
                SkASSERT(1 == fCInfo.comp_info[1].h_samp_factor);
                SkASSERT(1 == fCInfo.comp_info[1].v_samp_factor);
                SkASSERT(1 == fCInfo.comp_info[2].h_samp_factor);
                SkASSERT(1 == fCInfo.comp_info[2].v_samp_factor);
                break;
            case SkJpegEncoder::Downsample::k422:
                fCInfo.comp_info[0].h_samp_factor = 2;
                fCInfo.comp_info[0].v_samp_factor = 1;
                fCInfo.comp_info[1].h_samp_factor = 1;
                fCInfo.comp_info[1].v_samp_factor = 1;
                fCInfo.comp_info[2].h_samp_factor = 1;
                fCInfo.comp_info[2].v_samp_factor = 1;
                break;
            case SkJpegEncoder::Downsample::k444:
                fCInfo.comp_info[0].h_samp_factor = 1;
                fCInfo.comp_info[0].v_samp_factor = 1;
                fCInfo.comp_info[1].h_samp_factor = 1;
                fCInfo.comp_info[1].v_samp_factor = 1;
                fCInfo.comp_info[2].h_samp_factor = 1;
                fCInfo.comp_info[2].v_samp_factor = 1;
                break;
        }
    }

    // Tells libjpeg-turbo to compute optimal Huffman coding tables
    // for the image.  This improves compression at the cost of
    // slower encode performance.
    fCInfo.optimize_coding = TRUE;
    return true;
}
Beispiel #4
0
bool SkPngEncoderMgr::setHeader(const SkImageInfo& srcInfo, const SkPngEncoder::Options& options) {
    if (setjmp(png_jmpbuf(fPngPtr))) {
        return false;
    }

    int pngColorType;
    png_color_8 sigBit;
    int bitDepth = 8;
    switch (srcInfo.colorType()) {
        case kRGBA_F16_SkColorType:
        case kRGBA_F32_SkColorType:
            sigBit.red = 16;
            sigBit.green = 16;
            sigBit.blue = 16;
            sigBit.alpha = 16;
            bitDepth = 16;
            pngColorType = srcInfo.isOpaque() ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGB_ALPHA;
            fPngBytesPerPixel = 8;
            break;
        case kGray_8_SkColorType:
            sigBit.gray = 8;
            pngColorType = PNG_COLOR_TYPE_GRAY;
            fPngBytesPerPixel = 1;
            SkASSERT(srcInfo.isOpaque());
            break;
        case kRGBA_8888_SkColorType:
        case kBGRA_8888_SkColorType:
            sigBit.red = 8;
            sigBit.green = 8;
            sigBit.blue = 8;
            sigBit.alpha = 8;
            pngColorType = srcInfo.isOpaque() ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGB_ALPHA;
            fPngBytesPerPixel = srcInfo.isOpaque() ? 3 : 4;
            break;
        case kRGB_888x_SkColorType:
            sigBit.red   = 8;
            sigBit.green = 8;
            sigBit.blue  = 8;
            pngColorType = PNG_COLOR_TYPE_RGB;
            fPngBytesPerPixel = 3;
            SkASSERT(srcInfo.isOpaque());
            break;
        case kARGB_4444_SkColorType:
            if (kUnpremul_SkAlphaType == srcInfo.alphaType()) {
                return false;
            }

            sigBit.red = 4;
            sigBit.green = 4;
            sigBit.blue = 4;
            sigBit.alpha = 4;
            pngColorType = srcInfo.isOpaque() ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGB_ALPHA;
            fPngBytesPerPixel = srcInfo.isOpaque() ? 3 : 4;
            break;
        case kRGB_565_SkColorType:
            sigBit.red = 5;
            sigBit.green = 6;
            sigBit.blue = 5;
            pngColorType = PNG_COLOR_TYPE_RGB;
            fPngBytesPerPixel = 3;
            SkASSERT(srcInfo.isOpaque());
            break;
        case kAlpha_8_SkColorType:  // store as gray+alpha, but ignore gray
            sigBit.gray = kGraySigBit_GrayAlphaIsJustAlpha;
            sigBit.alpha = 8;
            pngColorType = PNG_COLOR_TYPE_GRAY_ALPHA;
            fPngBytesPerPixel = 2;
            break;
        case kRGBA_1010102_SkColorType:
            bitDepth     = 16;
            sigBit.red   = 10;
            sigBit.green = 10;
            sigBit.blue  = 10;
            sigBit.alpha = 2;
            pngColorType = srcInfo.isOpaque() ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGB_ALPHA;
            fPngBytesPerPixel = 8;
            break;
        case kRGB_101010x_SkColorType:
            bitDepth     = 16;
            sigBit.red   = 10;
            sigBit.green = 10;
            sigBit.blue  = 10;
            pngColorType = PNG_COLOR_TYPE_RGB;
            fPngBytesPerPixel = 6;
            break;
        default:
            return false;
    }

    png_set_IHDR(fPngPtr, fInfoPtr, srcInfo.width(), srcInfo.height(),
                 bitDepth, pngColorType,
                 PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,
                 PNG_FILTER_TYPE_BASE);
    png_set_sBIT(fPngPtr, fInfoPtr, &sigBit);

    int filters = (int)options.fFilterFlags & (int)SkPngEncoder::FilterFlag::kAll;
    SkASSERT(filters == (int)options.fFilterFlags);
    png_set_filter(fPngPtr, PNG_FILTER_TYPE_BASE, filters);

    int zlibLevel = SkTMin(SkTMax(0, options.fZLibLevel), 9);
    SkASSERT(zlibLevel == options.fZLibLevel);
    png_set_compression_level(fPngPtr, zlibLevel);

    // Set comments in tEXt chunk
    const sk_sp<SkDataTable>& comments = options.fComments;
    if (comments != nullptr) {
        std::vector<png_text> png_texts(comments->count());
        std::vector<SkString> clippedKeys;
        for (int i = 0; i < comments->count() / 2; ++i) {
            const char* keyword;
            const char* originalKeyword = comments->atStr(2 * i);
            const char* text = comments->atStr(2 * i + 1);
            if (strlen(originalKeyword) <= PNG_KEYWORD_MAX_LENGTH) {
                keyword = originalKeyword;
            } else {
                SkDEBUGFAILF("PNG tEXt keyword should be no longer than %d.",
                        PNG_KEYWORD_MAX_LENGTH);
                clippedKeys.emplace_back(originalKeyword, PNG_KEYWORD_MAX_LENGTH);
                keyword = clippedKeys.back().c_str();
            }
            // It seems safe to convert png_const_charp to png_charp for key/text,
            // and we don't have to provide text_length and other fields as we're providing
            // 0-terminated c_str with PNG_TEXT_COMPRESSION_NONE (no compression, no itxt).
            png_texts[i].compression = PNG_TEXT_COMPRESSION_NONE;
            png_texts[i].key = (png_charp)keyword;
            png_texts[i].text = (png_charp)text;
        }
        png_set_text(fPngPtr, fInfoPtr, png_texts.data(), png_texts.size());
    }

    return true;
}