C++ SkMatrix::isIdentity方法代码示例

void SkDeferredCanvas::didConcat(const SkMatrix& matrix) {
    if (matrix.isIdentity()) {
        return;
    }
    if (!this->push_concat(matrix)) {
        this->flush_all();
        fCanvas->concat(matrix);
        this->INHERITED::didConcat(matrix);
    }
}

void GraphicsContext::concatCTM(const SkMatrix& affine)
{
	if (paintingDisabled())
		return;
	if (!affine.isIdentity())
		nvgTransform(platformContext()->canvas(), affine.get(SkMatrix::kMScaleX),
		affine.get(SkMatrix::kMSkewY), affine.get(SkMatrix::kMSkewX),
		affine.get(SkMatrix::kMScaleY), affine.get(SkMatrix::kMTransX),
		affine.get(SkMatrix::kMTransY));
		//platformContext()->canvas()->concat(affine);
}

static void test_set9(skiatest::Reporter* reporter) {

    SkMatrix m;
    m.reset();
    assert9(reporter, m, 1, 0, 0, 0, 1, 0, 0, 0, 1);

    m.setScale(2, 3);
    assert9(reporter, m, 2, 0, 0, 0, 3, 0, 0, 0, 1);

    m.postTranslate(4, 5);
    assert9(reporter, m, 2, 0, 4, 0, 3, 5, 0, 0, 1);

    SkScalar buffer[9];
    sk_bzero(buffer, sizeof(buffer));
    buffer[SkMatrix::kMScaleX] = 1;
    buffer[SkMatrix::kMScaleY] = 1;
    buffer[SkMatrix::kMPersp2] = 1;
    REPORTER_ASSERT(reporter, !m.isIdentity());
    m.set9(buffer);
    REPORTER_ASSERT(reporter, m.isIdentity());
}

sk_sp<SkImageFilter> SkLocalMatrixImageFilter::Make(const SkMatrix& localM,
                                                    sk_sp<SkImageFilter> input) {
    if (!input) {
        return nullptr;
    }
    if (localM.getType() & (SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask)) {
        return nullptr;
    }
    if (localM.isIdentity()) {
        return input;
    }
    return sk_sp<SkImageFilter>(new SkLocalMatrixImageFilter(localM, input));
}

void SkGPipeCanvas::didConcat(const SkMatrix& matrix) {
    if (!matrix.isIdentity()) {
        NOTIFY_SETUP(this);
        switch (matrix.getType()) {
            case SkMatrix::kTranslate_Mask:
                this->recordTranslate(matrix);
                break;
            case SkMatrix::kScale_Mask:
                this->recordScale(matrix);
                break;
            default:
                this->recordConcat(matrix);
                break;
        }
    }

    this->INHERITED::didConcat(matrix);
}

sk_sp<SkShader> SkShader::makeWithLocalMatrix(const SkMatrix& localMatrix) const {
    if (localMatrix.isIdentity()) {
        return sk_ref_sp(const_cast<SkShader*>(this));
    }

    const SkMatrix* lm = &localMatrix;

    SkShader* baseShader = const_cast<SkShader*>(this);
    SkMatrix otherLocalMatrix;
    SkAutoTUnref<SkShader> proxy(this->refAsALocalMatrixShader(&otherLocalMatrix));
    if (proxy) {
        otherLocalMatrix.preConcat(localMatrix);
        lm = &otherLocalMatrix;
        baseShader = proxy.get();
    }

    return sk_make_sp<SkLocalMatrixShader>(baseShader, *lm);
}

bool SkRasterClip::op(const SkPath& path, const SkMatrix& matrix, const SkIRect& devBounds,
                      SkRegion::Op op, bool doAA) {
    AUTO_RASTERCLIP_VALIDATE(*this);
    SkIRect bounds(devBounds);
    this->applyClipRestriction(op, &bounds);

    // base is used to limit the size (and therefore memory allocation) of the
    // region that results from scan converting devPath.
    SkRegion base;

    SkPath devPath;
    if (matrix.isIdentity()) {
        devPath = path;
    } else {
        path.transform(matrix, &devPath);
        devPath.setIsVolatile(true);
    }
    if (SkRegion::kIntersect_Op == op) {
        // since we are intersect, we can do better (tighter) with currRgn's
        // bounds, than just using the device. However, if currRgn is complex,
        // our region blitter may hork, so we do that case in two steps.
        if (this->isRect()) {
            // FIXME: we should also be able to do this when this->isBW(),
            // but relaxing the test above triggers GM asserts in
            // SkRgnBuilder::blitH(). We need to investigate what's going on.
            return this->setPath(devPath, this->bwRgn(), doAA);
        } else {
            base.setRect(this->getBounds());
            SkRasterClip clip;
            clip.setPath(devPath, base, doAA);
            return this->op(clip, op);
        }
    } else {
        base.setRect(bounds);

        if (SkRegion::kReplace_Op == op) {
            return this->setPath(devPath, base, doAA);
        } else {
            SkRasterClip clip;
            clip.setPath(devPath, base, doAA);
            return this->op(clip, op);
        }
    }
}

static void populate_tiling_pattern_dict(SkPDFDict* pattern,
                                      SkRect& bbox, SkPDFDict* resources,
                                      const SkMatrix& matrix) {
    const int kTiling_PatternType = 1;
    const int kColoredTilingPattern_PaintType = 1;
    const int kConstantSpacing_TilingType = 1;

    pattern->insertName("Type", "Pattern");
    pattern->insertInt("PatternType", kTiling_PatternType);
    pattern->insertInt("PaintType", kColoredTilingPattern_PaintType);
    pattern->insertInt("TilingType", kConstantSpacing_TilingType);
    pattern->insert("BBox", SkPDFUtils::RectToArray(bbox))->unref();
    pattern->insertScalar("XStep", bbox.width());
    pattern->insertScalar("YStep", bbox.height());
    pattern->insert("Resources", resources);
    if (!matrix.isIdentity()) {
        pattern->insert("Matrix", SkPDFUtils::MatrixToArray(matrix))->unref();
    }
}

sk_sp<GrGeometryProcessor> GrDefaultGeoProcFactory::MakeForDeviceSpace(
                                                                     const Color& color,
                                                                     const Coverage& coverage,
                                                                     const LocalCoords& localCoords,
                                                                     const SkMatrix& viewMatrix) {
    SkMatrix invert = SkMatrix::I();
    if (LocalCoords::kUnused_Type != localCoords.fType) {
        SkASSERT(LocalCoords::kUsePosition_Type == localCoords.fType);
        if (!viewMatrix.isIdentity() && !viewMatrix.invert(&invert)) {
            return nullptr;
        }

        if (localCoords.hasLocalMatrix()) {
            invert.preConcat(*localCoords.fMatrix);
        }
    }

    LocalCoords inverted(LocalCoords::kUsePosition_Type, &invert);
    return Make(color, coverage, inverted, SkMatrix::I());
}

void GrGLGeometryProcessor::setupPosition(GrGLGPBuilder* pb,
                                          GrGPArgs* gpArgs,
                                          const char* posName,
                                          const SkMatrix& mat) {
    GrGLVertexBuilder* vsBuilder = pb->getVertexShaderBuilder();
    if (mat.isIdentity()) {
        gpArgs->fPositionVar.set(kVec2f_GrSLType, "pos2");

        vsBuilder->codeAppendf("vec2 %s = %s;", gpArgs->fPositionVar.c_str(), posName);
    } else if (!mat.hasPerspective()) {
        this->addUniformViewMatrix(pb);
        gpArgs->fPositionVar.set(kVec2f_GrSLType, "pos2");

        vsBuilder->codeAppendf("vec2 %s = vec2(%s * vec3(%s, 1));",
                               gpArgs->fPositionVar.c_str(), this->uViewM(), posName);
    } else {
        this->addUniformViewMatrix(pb);
        gpArgs->fPositionVar.set(kVec3f_GrSLType, "pos3");

        vsBuilder->codeAppendf("vec3 %s = %s * vec3(%s, 1);",
                               gpArgs->fPositionVar.c_str(), this->uViewM(), posName);
    }
}

SkPDFShader::State::State(const SkShader& shader, const SkMatrix& canvasTransform,
                          const SkIRect& bbox, SkScalar rasterScale)
        : fCanvasTransform(canvasTransform),
          fBBox(bbox),
          fPixelGeneration(0) {
    fInfo.fColorCount = 0;
    fInfo.fColors = NULL;
    fInfo.fColorOffsets = NULL;
    fShaderTransform = shader.getLocalMatrix();
    fImageTileModes[0] = fImageTileModes[1] = SkShader::kClamp_TileMode;

    fType = shader.asAGradient(&fInfo);

    if (fType == SkShader::kNone_GradientType) {
        SkShader::BitmapType bitmapType;
        SkMatrix matrix;
        bitmapType = shader.asABitmap(&fImage, &matrix, fImageTileModes);
        if (bitmapType != SkShader::kDefault_BitmapType) {
            // Generic fallback for unsupported shaders:
            //  * allocate a bbox-sized bitmap
            //  * shade the whole area
            //  * use the result as a bitmap shader

            // bbox is in device space. While that's exactly what we want for sizing our bitmap,
            // we need to map it into shader space for adjustments (to match
            // SkPDFImageShader::Create's behavior).
            SkRect shaderRect = SkRect::Make(bbox);
            if (!inverse_transform_bbox(canvasTransform, &shaderRect)) {
                fImage.reset();
                return;
            }

            // Clamp the bitmap size to about 1M pixels
            static const SkScalar kMaxBitmapArea = 1024 * 1024;
            SkScalar bitmapArea = rasterScale * bbox.width() * rasterScale * bbox.height();
            if (bitmapArea > kMaxBitmapArea) {
                rasterScale *= SkScalarSqrt(SkScalarDiv(kMaxBitmapArea, bitmapArea));
            }

            SkISize size = SkISize::Make(SkScalarRoundToInt(rasterScale * bbox.width()),
                                         SkScalarRoundToInt(rasterScale * bbox.height()));
            SkSize scale = SkSize::Make(SkIntToScalar(size.width()) / shaderRect.width(),
                                        SkIntToScalar(size.height()) / shaderRect.height());

            fImage.allocN32Pixels(size.width(), size.height());
            fImage.eraseColor(SK_ColorTRANSPARENT);

            SkPaint p;
            p.setShader(const_cast<SkShader*>(&shader));

            SkCanvas canvas(fImage);
            canvas.scale(scale.width(), scale.height());
            canvas.translate(-shaderRect.x(), -shaderRect.y());
            canvas.drawPaint(p);

            fShaderTransform.setTranslate(shaderRect.x(), shaderRect.y());
            fShaderTransform.preScale(1 / scale.width(), 1 / scale.height());
        } else {
            SkASSERT(matrix.isIdentity());
        }
        fPixelGeneration = fImage.getGenerationID();
    } else {
        AllocateGradientInfoStorage();
        shader.asAGradient(&fInfo);
    }
}

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

                FT_Outline_Get_Bitmap(face->glyph->library, outline, &target);
#ifdef SK_SHOW_TEXT_BLIT_COVERAGE
                for (int y = 0; y < glyph.fHeight; ++y) {
                    for (int x = 0; x < glyph.fWidth; ++x) {
                        uint8_t& a = ((uint8_t*)glyph.fImage)[(glyph.rowBytes() * y) + x];
                        a = SkTMax<uint8_t>(a, 0x20);
                    }
                }
#endif
            }
        } 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 no scaling needed, directly copy glyph bitmap.
            if (bitmapTransform.isIdentity()) {
                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;
            // TODO: mark this as sRGB when the blits will be sRGB.
            unscaledBitmap.allocPixels(SkImageInfo::Make(face->glyph->bitmap.width,
                                                         face->glyph->bitmap.rows,
                                                         SkColorType_for_FTPixelMode(pixel_mode),
                                                         kPremul_SkAlphaType));

            SkMask unscaledBitmapAlias;
            unscaledBitmapAlias.fImage = reinterpret_cast<uint8_t*>(unscaledBitmap.getPixels());
            unscaledBitmapAlias.fBounds.set(0, 0, unscaledBitmap.width(), unscaledBitmap.height());
            unscaledBitmapAlias.fRowBytes = unscaledBitmap.rowBytes();
            unscaledBitmapAlias.fFormat = SkMaskFormat_for_SkColorType(unscaledBitmap.colorType());
            copyFTBitmap(face->glyph->bitmap, unscaledBitmapAlias);

            // Wrap the glyph's mask in a bitmap, unless the glyph's mask is BW or LCD.
            // BW requires an A8 target for resizing, which can then be down sampled.
            // LCD should use a 4x A8 target, which will then be down sampled.
            // For simplicity, LCD uses A8 and is replicated.
            int bitmapRowBytes = 0;
            if (SkMask::kBW_Format != maskFormat && SkMask::kLCD16_Format != maskFormat) {
                bitmapRowBytes = glyph.rowBytes();
            }
            SkBitmap dstBitmap;

static void draw_path_with_mask_filter(GrContext* context,
                                       GrDrawContext* drawContext,
                                       const GrClip& clip,
                                       GrPaint* paint,
                                       const SkMatrix& viewMatrix,
                                       const SkMaskFilter* maskFilter,
                                       const GrStyle& style,
                                       const SkPath* path,
                                       bool pathIsMutable) {
    SkASSERT(maskFilter);

    SkIRect clipBounds;
    clip.getConservativeBounds(drawContext->width(), drawContext->height(), &clipBounds);
    SkTLazy<SkPath> tmpPath;
    SkStrokeRec::InitStyle fillOrHairline;

    // We just fully apply the style here.
    if (style.applies()) {
        if (!style.applyToPath(tmpPath.init(), &fillOrHairline, *path,
                                   GrStyle::MatrixToScaleFactor(viewMatrix))) {
            return;
        }
        pathIsMutable = true;
        path = tmpPath.get();
    } else if (style.isSimpleHairline()) {
        fillOrHairline = SkStrokeRec::kHairline_InitStyle;
    } else {
        SkASSERT(style.isSimpleFill());
        fillOrHairline = SkStrokeRec::kFill_InitStyle;
    }

    // transform the path into device space
    if (!viewMatrix.isIdentity()) {
        SkPath* result;
        if (pathIsMutable) {
            result = const_cast<SkPath*>(path);
        } else {
            if (!tmpPath.isValid()) {
                tmpPath.init();
            }
            result = tmpPath.get();
        }
        path->transform(viewMatrix, result);
        path = result;
        result->setIsVolatile(true);
        pathIsMutable = true;
    }

    SkRect maskRect;
    if (maskFilter->canFilterMaskGPU(SkRRect::MakeRect(path->getBounds()),
                                     clipBounds,
                                     viewMatrix,
                                     &maskRect)) {
        // This mask will ultimately be drawn as a non-AA rect (see draw_mask).
        // Non-AA rects have a bad habit of snapping arbitrarily. Integerize here
        // so the mask draws in a reproducible manner.
        SkIRect finalIRect;
        maskRect.roundOut(&finalIRect);
        if (clip_bounds_quick_reject(clipBounds, finalIRect)) {
            // clipped out
            return;
        }

        if (maskFilter->directFilterMaskGPU(context->textureProvider(),
                                            drawContext,
                                            paint,
                                            clip,
                                            viewMatrix,
                                            SkStrokeRec(fillOrHairline),
                                            *path)) {
            // the mask filter was able to draw itself directly, so there's nothing
            // left to do.
            return;
        }

        sk_sp<GrTexture> mask(create_mask_GPU(context,
                                              finalIRect,
                                              *path,
                                              fillOrHairline,
                                              paint->isAntiAlias(),
                                              drawContext->numColorSamples()));
        if (mask) {
            GrTexture* filtered;

            if (maskFilter->filterMaskGPU(mask.get(), viewMatrix, finalIRect, &filtered, true)) {
                // filterMaskGPU gives us ownership of a ref to the result
                SkAutoTUnref<GrTexture> atu(filtered);
                if (draw_mask(drawContext, clip, viewMatrix, finalIRect, paint, filtered)) {
                    // This path is completely drawn
                    return;
                }
            }
        }
    }

    sw_draw_with_mask_filter(drawContext, context->textureProvider(),
                             clip, viewMatrix, *path,
                             maskFilter, clipBounds, paint, fillOrHairline);
}

Boolean Matrix::NativeIsIdentity(
    /* [in] */ Int64 nObj)
{
    SkMatrix* obj = reinterpret_cast<SkMatrix*>(nObj);
    return obj->isIdentity() ? TRUE : FALSE;
}

 static jboolean isIdentity(JNIEnv* env, jobject clazz, jlong objHandle) {
     SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
     return obj->isIdentity() ? JNI_TRUE : JNI_FALSE;
 }