C++ SkImageInfo::profileType方法代码示例

bool SkImage_Gpu::onReadPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
                               int srcX, int srcY) const {
    GrPixelConfig config = SkImageInfo2GrPixelConfig(info.colorType(), info.alphaType(),
                                                     info.profileType());
    uint32_t flags = 0;
    if (kUnpremul_SkAlphaType == info.alphaType() && kPremul_SkAlphaType == fAlphaType) {
        // let the GPU perform this transformation for us
        flags = GrContext::kUnpremul_PixelOpsFlag;
    }
    if (!fTexture->readPixels(srcX, srcY, info.width(), info.height(), config,
                              pixels, rowBytes, flags)) {
        return false;
    }
    // do we have to manually fix-up the alpha channel?
    //      src         dst
    //      unpremul    premul      fix manually
    //      premul      unpremul    done by kUnpremul_PixelOpsFlag
    // all other combos need to change.
    //
    // Should this be handled by Ganesh? todo:?
    //
    if (kPremul_SkAlphaType == info.alphaType() && kUnpremul_SkAlphaType == fAlphaType) {
        apply_premul(info, pixels, rowBytes);
    }
    return true;
}

DEF_TEST(ColorSpace_Named, r) {
    const struct {
        SkColorSpace::Named fNamed;
        bool fExpectedToSucceed;
        bool fIsSRGB;
    } recs[] {
        { SkColorSpace::kUnknown_Named,  false, false },
        { SkColorSpace::kSRGB_Named,     true,  true },
        { SkColorSpace::kAdobeRGB_Named, true,  false },
    };

    for (auto rec : recs) {
        auto cs = SkColorSpace::NewNamed(rec.fNamed);
        REPORTER_ASSERT(r, !cs == !rec.fExpectedToSucceed);
        if (cs) {
            if (rec.fIsSRGB) {
                REPORTER_ASSERT(r, SkColorSpace::kSRGB_GammaNamed == cs->gammaNamed());
            } else {
                REPORTER_ASSERT(r, SkColorSpace::k2Dot2Curve_GammaNamed == cs->gammaNamed());
            }
        }
    }

    SkImageInfo info = SkImageInfo::MakeS32(10, 10, kPremul_SkAlphaType);
    REPORTER_ASSERT(r, kSRGB_SkColorProfileType == info.profileType());
    REPORTER_ASSERT(r, SkColorSpace::kSRGB_GammaNamed == info.colorSpace()->gammaNamed());
}

/*
 * Checks if the conversion between the input image and the requested output
 * image has been implemented
 */
static bool conversion_possible(const SkImageInfo& dst,
                                const SkImageInfo& src) {
    // Ensure that the profile type is unchanged
    if (dst.profileType() != src.profileType()) {
        return false;
    }

    // Ensure that the alpha type is opaque
    if (kOpaque_SkAlphaType != dst.alphaType()) {
        return false;
    }

    // Always allow kN32 as the color type
    if (kN32_SkColorType == dst.colorType()) {
        return true;
    }

    // Otherwise require that the destination color type match our recommendation
    return dst.colorType() == src.colorType();
}

/*
 * Checks if the conversion between the input image and the requested output
 * image has been implemented
 * Sets the output color space
 */
bool SkJpegCodec::setOutputColorSpace(const SkImageInfo& dst) {
    const SkImageInfo& src = this->getInfo();

    // Ensure that the profile type is unchanged
    if (dst.profileType() != src.profileType()) {
        return false;
    }

    // Ensure that the alpha type is opaque
    if (kOpaque_SkAlphaType != dst.alphaType()) {
        return false;
    }

    // Check if we will decode to CMYK because a conversion to RGBA is not supported
    J_COLOR_SPACE colorSpace = fDecoderMgr->dinfo()->jpeg_color_space;
    bool isCMYK = JCS_CMYK == colorSpace || JCS_YCCK == colorSpace;

    // Check for valid color types and set the output color space
    switch (dst.colorType()) {
        case kN32_SkColorType:
            if (isCMYK) {
                fDecoderMgr->dinfo()->out_color_space = JCS_CMYK;
            } else {
                // Check the byte ordering of the RGBA color space for the
                // current platform
#if defined(SK_PMCOLOR_IS_RGBA)
                fDecoderMgr->dinfo()->out_color_space = JCS_EXT_RGBA;
#else
                fDecoderMgr->dinfo()->out_color_space = JCS_EXT_BGRA;
#endif
            }
            return true;
        case kRGB_565_SkColorType:
            if (isCMYK) {
                fDecoderMgr->dinfo()->out_color_space = JCS_CMYK;
            } else {
                fDecoderMgr->dinfo()->dither_mode = JDITHER_NONE;
                fDecoderMgr->dinfo()->out_color_space = JCS_RGB565;
            }
            return true;
        case kGray_8_SkColorType:
            if (isCMYK) {
                return false;
            } else {
                // We will enable decodes to gray even if the image is color because this is
                // much faster than decoding to color and then converting
                fDecoderMgr->dinfo()->out_color_space = JCS_GRAYSCALE;
            }
            return true;
        default:
            return false;
    }
}

static SkBitmap createBitmapWithSpace(const SkBitmap& bitmap, int spaceWidth, int spaceHeight)
{
    SkImageInfo info = bitmap.info();
    SkImageInfo newInfo = SkImageInfo::Make(
        info.width() + spaceWidth, info.height() + spaceHeight,
        info.colorType(), kPremul_SkAlphaType, info.profileType());

    SkBitmap result;
    result.allocPixels(newInfo);
    result.eraseColor(SK_ColorTRANSPARENT);
    bitmap.copyPixelsTo(reinterpret_cast<uint8_t*>(result.getPixels()), result.rowBytes() * result.height(), result.rowBytes());

    return result;
}

static bool choose_linear_pipeline(const SkShader::ContextRec& rec, const SkImageInfo& srcInfo) {
    // These src attributes are not supported in the new 4f context (yet)
    //
    if (srcInfo.profileType() != kSRGB_SkColorProfileType) { return false; }
    if (srcInfo.colorType() != kRGBA_8888_SkColorType
        && srcInfo.colorType() != kBGRA_8888_SkColorType
        && srcInfo.colorType() != kIndex_8_SkColorType
        && srcInfo.colorType() != kRGBA_F16_SkColorType) {
        return false;
    }

    // If we get here, we can reasonably use either context, respect the caller's preference
    //
    return SkShader::ContextRec::kPM4f_DstType == rec.fPreferredDstType;
}

/*
 * Checks if the conversion between the input image and the requested output
 * image has been implemented
 */
static bool conversion_possible(const SkImageInfo& dst,
                                const SkImageInfo& src) {
    // Ensure that the profile type is unchanged
    if (dst.profileType() != src.profileType()) {
        return false;
    }

    // Ensure the alpha type is valid
    if (!valid_alpha(dst.alphaType(), src.alphaType())) {
        return false;
    }

    // Check for supported color types
    switch (dst.colorType()) {
        // Allow output to kN32 from any type of input
        case kN32_SkColorType:
            return true;
        // Allow output to kIndex_8 from compatible inputs
        case kIndex_8_SkColorType:
            return kIndex_8_SkColorType == src.colorType();
        default:
            return false;
    }
}

void HelloWorldWindow::draw(SkCanvas* canvas) {
    drawContents(canvas);
    // in case we have queued drawing calls
    fContext->flush();
    // Invalidate the window to force a redraw. Poor man's animation mechanism.
    this->inval(NULL);

    if (kRaster_DeviceType == fType) {
        // need to send the raster bits to the (gpu) window
        SkImage* snap = fSurface->newImageSnapshot();
        size_t rowBytes;
        SkImageInfo info;
        const void* pixels = snap->peekPixels(&info, &rowBytes);
        fRenderTarget->writePixels(0, 0, snap->width(), snap->height(),
                                        SkImageInfo2GrPixelConfig(info.colorType(),
                                                                info.alphaType(),
                                                                info.profileType()),
                                        pixels,
                                        rowBytes,
                                        GrContext::kFlushWrites_PixelOp);
        SkSafeUnref(snap);
    }
    INHERITED::present();
}