예제 #1
0
bool SkBitmapProcState::chooseProcs(const SkMatrix& inv, const SkPaint& paint) {
    SkASSERT(fOrigBitmap.width() && fOrigBitmap.height());

    fBitmap = NULL;
    fInvMatrix = inv;
    fFilterLevel = paint.getFilterLevel();

    // possiblyScaleImage will look to see if it can rescale the image as a
    // preprocess; either by scaling up to the target size, or by selecting
    // a nearby mipmap level.  If it does, it will adjust the working
    // matrix as well as the working bitmap.  It may also adjust the filter
    // quality to avoid re-filtering an already perfectly scaled image.
    if (!this->possiblyScaleImage()) {
        if (!this->lockBaseBitmap()) {
            return false;
        }
    }
    // The above logic should have always assigned fBitmap, but in case it
    // didn't, we check for that now...
    // TODO(dominikg): Ask humper@ if we can just use an SkASSERT(fBitmap)?
    if (NULL == fBitmap) {
        return false;
    }

    // If we are "still" kMedium_FilterLevel, then the request was not fulfilled by possiblyScale,
    // so we downgrade to kLow (so the rest of the sniffing code can assume that)
    if (SkPaint::kMedium_FilterLevel == fFilterLevel) {
        fFilterLevel = SkPaint::kLow_FilterLevel;
    }

    bool trivialMatrix = (fInvMatrix.getType() & ~SkMatrix::kTranslate_Mask) == 0;
    bool clampClamp = SkShader::kClamp_TileMode == fTileModeX &&
                      SkShader::kClamp_TileMode == fTileModeY;

    if (!(fAdjustedMatrix || clampClamp || trivialMatrix)) {
        fInvMatrix.postIDiv(fOrigBitmap.width(), fOrigBitmap.height());
    }

    // Now that all possible changes to the matrix have taken place, check
    // to see if we're really close to a no-scale matrix.  If so, explicitly
    // set it to be so.  Subsequent code may inspect this matrix to choose
    // a faster path in this case.

    // This code will only execute if the matrix has some scale component;
    // if it's already pure translate then we won't do this inversion.

    if (matrix_only_scale_translate(fInvMatrix)) {
        SkMatrix forward;
        if (fInvMatrix.invert(&forward)) {
            if (clampClamp ? just_trans_clamp(forward, *fBitmap)
                            : just_trans_general(forward)) {
                SkScalar tx = -SkScalarRoundToScalar(forward.getTranslateX());
                SkScalar ty = -SkScalarRoundToScalar(forward.getTranslateY());
                fInvMatrix.setTranslate(tx, ty);
            }
        }
    }

    fInvProc        = fInvMatrix.getMapXYProc();
    fInvType        = fInvMatrix.getType();
    fInvSx          = SkScalarToFixed(fInvMatrix.getScaleX());
    fInvSxFractionalInt = SkScalarToFractionalInt(fInvMatrix.getScaleX());
    fInvKy          = SkScalarToFixed(fInvMatrix.getSkewY());
    fInvKyFractionalInt = SkScalarToFractionalInt(fInvMatrix.getSkewY());

    fAlphaScale = SkAlpha255To256(paint.getAlpha());

    fShaderProc32 = NULL;
    fShaderProc16 = NULL;
    fSampleProc32 = NULL;
    fSampleProc16 = NULL;

    // recompute the triviality of the matrix here because we may have
    // changed it!

    trivialMatrix = (fInvMatrix.getType() & ~SkMatrix::kTranslate_Mask) == 0;

    if (SkPaint::kHigh_FilterLevel == fFilterLevel) {
        // If this is still set, that means we wanted HQ sampling
        // but couldn't do it as a preprocess.  Let's try to install
        // the scanline version of the HQ sampler.  If that process fails,
        // downgrade to bilerp.

        // NOTE: Might need to be careful here in the future when we want
        // to have the platform proc have a shot at this; it's possible that
        // the chooseBitmapFilterProc will fail to install a shader but a
        // platform-specific one might succeed, so it might be premature here
        // to fall back to bilerp.  This needs thought.

        if (!this->setBitmapFilterProcs()) {
            fFilterLevel = SkPaint::kLow_FilterLevel;
        }
    }

    if (SkPaint::kLow_FilterLevel == fFilterLevel) {
        // Only try bilerp if the matrix is "interesting" and
        // the image has a suitable size.

        if (fInvType <= SkMatrix::kTranslate_Mask ||
                !valid_for_filtering(fBitmap->width() | fBitmap->height())) {
            fFilterLevel = SkPaint::kNone_FilterLevel;
        }
    }

    // At this point, we know exactly what kind of sampling the per-scanline
    // shader will perform.

    fMatrixProc = this->chooseMatrixProc(trivialMatrix);
    // TODO(dominikg): SkASSERT(fMatrixProc) instead? chooseMatrixProc never returns NULL.
    if (NULL == fMatrixProc) {
        return false;
    }

    ///////////////////////////////////////////////////////////////////////

    const SkAlphaType at = fBitmap->alphaType();

    // No need to do this if we're doing HQ sampling; if filter quality is
    // still set to HQ by the time we get here, then we must have installed
    // the shader procs above and can skip all this.

    if (fFilterLevel < SkPaint::kHigh_FilterLevel) {

        int index = 0;
        if (fAlphaScale < 256) {  // note: this distinction is not used for D16
            index |= 1;
        }
        if (fInvType <= (SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask)) {
            index |= 2;
        }
        if (fFilterLevel > SkPaint::kNone_FilterLevel) {
            index |= 4;
        }
        // bits 3,4,5 encoding the source bitmap format
        switch (fBitmap->colorType()) {
            case kN32_SkColorType:
                if (kPremul_SkAlphaType != at && kOpaque_SkAlphaType != at) {
                    return false;
                }
                index |= 0;
                break;
            case kRGB_565_SkColorType:
                index |= 8;
                break;
            case kIndex_8_SkColorType:
                if (kPremul_SkAlphaType != at && kOpaque_SkAlphaType != at) {
                    return false;
                }
                index |= 16;
                break;
            case kARGB_4444_SkColorType:
                if (kPremul_SkAlphaType != at && kOpaque_SkAlphaType != at) {
                    return false;
                }
                index |= 24;
                break;
            case kAlpha_8_SkColorType:
                index |= 32;
                fPaintPMColor = SkPreMultiplyColor(paint.getColor());
                break;
            default:
                // TODO(dominikg): Should we ever get here? SkASSERT(false) instead?
                return false;
        }

    #if !SK_ARM_NEON_IS_ALWAYS
        static const SampleProc32 gSkBitmapProcStateSample32[] = {
            S32_opaque_D32_nofilter_DXDY,
            S32_alpha_D32_nofilter_DXDY,
            S32_opaque_D32_nofilter_DX,
            S32_alpha_D32_nofilter_DX,
            S32_opaque_D32_filter_DXDY,
            S32_alpha_D32_filter_DXDY,
            S32_opaque_D32_filter_DX,
            S32_alpha_D32_filter_DX,

            S16_opaque_D32_nofilter_DXDY,
            S16_alpha_D32_nofilter_DXDY,
            S16_opaque_D32_nofilter_DX,
            S16_alpha_D32_nofilter_DX,
            S16_opaque_D32_filter_DXDY,
            S16_alpha_D32_filter_DXDY,
            S16_opaque_D32_filter_DX,
            S16_alpha_D32_filter_DX,

            SI8_opaque_D32_nofilter_DXDY,
            SI8_alpha_D32_nofilter_DXDY,
            SI8_opaque_D32_nofilter_DX,
            SI8_alpha_D32_nofilter_DX,
            SI8_opaque_D32_filter_DXDY,
            SI8_alpha_D32_filter_DXDY,
            SI8_opaque_D32_filter_DX,
            SI8_alpha_D32_filter_DX,

            S4444_opaque_D32_nofilter_DXDY,
            S4444_alpha_D32_nofilter_DXDY,
            S4444_opaque_D32_nofilter_DX,
            S4444_alpha_D32_nofilter_DX,
            S4444_opaque_D32_filter_DXDY,
            S4444_alpha_D32_filter_DXDY,
            S4444_opaque_D32_filter_DX,
            S4444_alpha_D32_filter_DX,

            // A8 treats alpha/opaque the same (equally efficient)
            SA8_alpha_D32_nofilter_DXDY,
            SA8_alpha_D32_nofilter_DXDY,
            SA8_alpha_D32_nofilter_DX,
            SA8_alpha_D32_nofilter_DX,
            SA8_alpha_D32_filter_DXDY,
            SA8_alpha_D32_filter_DXDY,
            SA8_alpha_D32_filter_DX,
            SA8_alpha_D32_filter_DX
        };

        static const SampleProc16 gSkBitmapProcStateSample16[] = {
            S32_D16_nofilter_DXDY,
            S32_D16_nofilter_DX,
            S32_D16_filter_DXDY,
            S32_D16_filter_DX,

            S16_D16_nofilter_DXDY,
            S16_D16_nofilter_DX,
            S16_D16_filter_DXDY,
            S16_D16_filter_DX,

            SI8_D16_nofilter_DXDY,
            SI8_D16_nofilter_DX,
            SI8_D16_filter_DXDY,
            SI8_D16_filter_DX,

            // Don't support 4444 -> 565
            NULL, NULL, NULL, NULL,
            // Don't support A8 -> 565
            NULL, NULL, NULL, NULL
        };
    #endif

        fSampleProc32 = SK_ARM_NEON_WRAP(gSkBitmapProcStateSample32)[index];
        index >>= 1;    // shift away any opaque/alpha distinction
        fSampleProc16 = SK_ARM_NEON_WRAP(gSkBitmapProcStateSample16)[index];

        // our special-case shaderprocs
        if (SK_ARM_NEON_WRAP(S16_D16_filter_DX) == fSampleProc16) {
            if (clampClamp) {
                fShaderProc16 = SK_ARM_NEON_WRAP(Clamp_S16_D16_filter_DX_shaderproc);
            } else if (SkShader::kRepeat_TileMode == fTileModeX &&
                       SkShader::kRepeat_TileMode == fTileModeY) {
                fShaderProc16 = SK_ARM_NEON_WRAP(Repeat_S16_D16_filter_DX_shaderproc);
            }
        } else if (SK_ARM_NEON_WRAP(SI8_opaque_D32_filter_DX) == fSampleProc32 && clampClamp) {
            fShaderProc32 = SK_ARM_NEON_WRAP(Clamp_SI8_opaque_D32_filter_DX_shaderproc);
        }

        if (NULL == fShaderProc32) {
            fShaderProc32 = this->chooseShaderProc32();
        }
    }
예제 #2
0
/*
 *  Analyze filter-quality and matrix, and decide how to implement that.
 *
 *  In general, we cascade down the request level [ High ... None ]
 *  - for a given level, if we can fulfill it, fine, else
 *    - else we downgrade to the next lower level and try again.
 *  We can always fulfill requests for Low and None
 *  - sometimes we will "ignore" Low and give None, but this is likely a legacy perf hack
 *    and may be removed.
 */
bool SkBitmapProcState::chooseProcs(const SkMatrix& inv, const SkPaint& paint) {
    fPixmap.reset();
    fInvMatrix = inv;
    fFilterLevel = paint.getFilterQuality();

    const int origW = fProvider.info().width();
    const int origH = fProvider.info().height();
    bool allow_ignore_fractional_translate = true;  // historical default
    if (kMedium_SkFilterQuality == fFilterLevel) {
        allow_ignore_fractional_translate = false;
    }

    SkDefaultBitmapController controller;
    fBMState = controller.requestBitmap(fProvider, inv, paint.getFilterQuality(),
                                        fBMStateStorage.get(), fBMStateStorage.size());
    // Note : we allow the controller to return an empty (zero-dimension) result. Should we?
    if (nullptr == fBMState || fBMState->pixmap().info().isEmpty()) {
        return false;
    }
    fPixmap = fBMState->pixmap();
    fInvMatrix = fBMState->invMatrix();
    fFilterLevel = fBMState->quality();
    SkASSERT(fPixmap.addr());
    
    bool trivialMatrix = (fInvMatrix.getType() & ~SkMatrix::kTranslate_Mask) == 0;
    bool clampClamp = SkShader::kClamp_TileMode == fTileModeX &&
                      SkShader::kClamp_TileMode == fTileModeY;

    // Most of the scanline procs deal with "unit" texture coordinates, as this
    // makes it easy to perform tiling modes (repeat = (x & 0xFFFF)). To generate
    // those, we divide the matrix by its dimensions here.
    //
    // We don't do this if we're either trivial (can ignore the matrix) or clamping
    // in both X and Y since clamping to width,height is just as easy as to 0xFFFF.

    if (!(clampClamp || trivialMatrix)) {
        fInvMatrix.postIDiv(fPixmap.width(), fPixmap.height());
    }

    // Now that all possible changes to the matrix have taken place, check
    // to see if we're really close to a no-scale matrix.  If so, explicitly
    // set it to be so.  Subsequent code may inspect this matrix to choose
    // a faster path in this case.

    // This code will only execute if the matrix has some scale component;
    // if it's already pure translate then we won't do this inversion.

    if (matrix_only_scale_translate(fInvMatrix)) {
        SkMatrix forward;
        if (fInvMatrix.invert(&forward)) {
            if ((clampClamp && allow_ignore_fractional_translate)
                           ? just_trans_clamp(forward, fPixmap)
                           : just_trans_general(forward)) {
                fInvMatrix.setTranslate(-forward.getTranslateX(), -forward.getTranslateY());
            }
        }
    }

    fInvProc        = fInvMatrix.getMapXYProc();
    fInvType        = fInvMatrix.getType();
    fInvSx          = SkScalarToFixed(fInvMatrix.getScaleX());
    fInvSxFractionalInt = SkScalarToFractionalInt(fInvMatrix.getScaleX());
    fInvKy          = SkScalarToFixed(fInvMatrix.getSkewY());
    fInvKyFractionalInt = SkScalarToFractionalInt(fInvMatrix.getSkewY());

    fAlphaScale = SkAlpha255To256(paint.getAlpha());

    fShaderProc32 = nullptr;
    fShaderProc16 = nullptr;
    fSampleProc32 = nullptr;

    // recompute the triviality of the matrix here because we may have
    // changed it!

    trivialMatrix = (fInvMatrix.getType() & ~SkMatrix::kTranslate_Mask) == 0;

    // If our target pixmap is the same as the original, then we revert back to legacy behavior
    // and allow the code to ignore fractional translate.
    //
    // The width/height check allows allow_ignore_fractional_translate to stay false if we
    // previously set it that way (e.g. we started in kMedium).
    //
    if (fPixmap.width() == origW && fPixmap.height() == origH) {
        allow_ignore_fractional_translate = true;
    }

    if (kLow_SkFilterQuality == fFilterLevel && allow_ignore_fractional_translate) {
        // Only try bilerp if the matrix is "interesting" and
        // the image has a suitable size.

        if (fInvType <= SkMatrix::kTranslate_Mask ||
            !valid_for_filtering(fPixmap.width() | fPixmap.height()))
        {
            fFilterLevel = kNone_SkFilterQuality;
        }
    }

    return this->chooseScanlineProcs(trivialMatrix, clampClamp, paint);
}