ThorVG: update to v0.11.0 release.

See https://github.com/thorvg/thorvg/releases/tag/v0.11.0

+ Infrastructure
    Repository folder structure was make it more intuitive and coherent.
        "thorvg/src/lib" -> "thorvg/src/common"
            (providing essential common functionalities
                used internally among the renderer and sub-modules)
        "thorvg/src/lib" -> "thorvg/src/renderer"
            (for vector drawing features)

+ SVG related
    Fix stroke regression https://github.com/thorvg/thorvg/issues/1670
    Support stroke dash offset function https://github.com/thorvg/thorvg/issues/1591#issuecomment-1681319321
    Support Focal property in Radial Gradient https://github.com/thorvg/thorvg/issues/1558

1 files changed, 856 insertions, 0 deletions

diff --git a/thirdparty/thorvg/src/renderer/sw_engine/tvgSwRenderer.cpp b/thirdparty/thorvg/src/renderer/sw_engine/tvgSwRenderer.cpp
new file mode 100644
index 0000000000..049aa3d1d0
--- /dev/null
+++ b/thirdparty/thorvg/src/renderer/sw_engine/tvgSwRenderer.cpp
@@ -0,0 +1,856 @@
+/*
+ * Copyright (c) 2020 - 2023 the ThorVG project. All rights reserved.
+
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "tvgMath.h"
+#include "tvgSwCommon.h"
+#include "tvgTaskScheduler.h"
+#include "tvgSwRenderer.h"
+
+/************************************************************************/
+/* Internal Class Implementation                                        */
+/************************************************************************/
+static int32_t initEngineCnt = false;
+static int32_t rendererCnt = 0;
+static SwMpool* globalMpool = nullptr;
+static uint32_t threadsCnt = 0;
+
+struct SwTask : Task
+{
+    SwSurface* surface = nullptr;
+    SwMpool* mpool = nullptr;
+    SwBBox bbox = {{0, 0}, {0, 0}};       //Whole Rendering Region
+    Matrix* transform = nullptr;
+    Array<RenderData> clips;
+    RenderUpdateFlag flags = RenderUpdateFlag::None;
+    uint8_t opacity;
+    bool pushed = false;                  //Pushed into task list?
+    bool disposed = false;                //Disposed task?
+
+    RenderRegion bounds() const
+    {
+        RenderRegion region;
+
+        //Range over?
+        region.x = bbox.min.x > 0 ? bbox.min.x : 0;
+        region.y = bbox.min.y > 0 ? bbox.min.y : 0;
+        region.w = bbox.max.x - region.x;
+        region.h = bbox.max.y - region.y;
+        if (region.w < 0) region.w = 0;
+        if (region.h < 0) region.h = 0;
+
+        return region;
+    }
+
+    virtual bool dispose() = 0;
+    virtual bool clip(SwRleData* target) = 0;
+    virtual SwRleData* rle() = 0;
+
+    virtual ~SwTask()
+    {
+        free(transform);
+    }
+};
+
+
+struct SwShapeTask : SwTask
+{
+    SwShape shape;
+    const RenderShape* rshape = nullptr;
+    bool cmpStroking = false;
+    bool clipper = false;
+
+    /* We assume that if the stroke width is greater than 2,
+       the shape's outline beneath the stroke could be adequately covered by the stroke drawing.
+       Therefore, antialiasing is disabled under this condition.
+       Additionally, the stroke style should not be dashed. */
+    bool antialiasing(float strokeWidth)
+    {
+        return strokeWidth < 2.0f || rshape->stroke->dashCnt > 0 || rshape->stroke->strokeFirst;
+    }
+
+    float validStrokeWidth()
+    {
+        if (!rshape->stroke) return 0.0f;
+
+        auto width = rshape->stroke->width;
+        if (mathZero(width)) return 0.0f;
+
+        if (!rshape->stroke->fill && (MULTIPLY(rshape->stroke->color[3], opacity) == 0)) return 0.0f;
+        if (mathZero(rshape->stroke->trim.begin - rshape->stroke->trim.end)) return 0.0f;
+
+        if (transform) return (width * sqrt(transform->e11 * transform->e11 + transform->e12 * transform->e12));
+        else return width;
+    }
+
+
+    bool clip(SwRleData* target) override
+    {
+        if (shape.fastTrack) rleClipRect(target, &bbox);
+        else if (shape.rle) rleClipPath(target, shape.rle);
+        else return false;
+
+        return true;
+    }
+
+    SwRleData* rle() override
+    {
+        if (!shape.rle && shape.fastTrack) {
+            shape.rle = rleRender(&shape.bbox);
+        }
+        return shape.rle;
+    }
+
+    void run(unsigned tid) override
+    {
+        if (opacity == 0 && !clipper) return;  //Invisible
+
+        auto strokeWidth = validStrokeWidth();
+        bool visibleFill = false;
+        auto clipRegion = bbox;
+
+        //This checks also for the case, if the invisible shape turned to visible by alpha.
+        auto prepareShape = false;
+        if (!shapePrepared(&shape) && (flags & RenderUpdateFlag::Color)) prepareShape = true;
+
+        //Shape
+        if (flags & (RenderUpdateFlag::Path | RenderUpdateFlag::Transform) || prepareShape) {
+            uint8_t alpha = 0;
+            rshape->fillColor(nullptr, nullptr, nullptr, &alpha);
+            alpha = MULTIPLY(alpha, opacity);
+            visibleFill = (alpha > 0 || rshape->fill);
+            if (visibleFill || clipper) {
+                shapeReset(&shape);
+                if (!shapePrepare(&shape, rshape, transform, clipRegion, bbox, mpool, tid, clips.count > 0 ? true : false)) goto err;
+            }
+        }
+        //Fill
+        if (flags & (RenderUpdateFlag::Gradient | RenderUpdateFlag::Transform | RenderUpdateFlag::Color)) {
+            if (visibleFill || clipper) {
+                if (!shapeGenRle(&shape, rshape, antialiasing(strokeWidth))) goto err;
+            }
+            if (auto fill = rshape->fill) {
+                auto ctable = (flags & RenderUpdateFlag::Gradient) ? true : false;
+                if (ctable) shapeResetFill(&shape);
+                if (!shapeGenFillColors(&shape, fill, transform, surface, opacity, ctable)) goto err;
+            } else {
+                shapeDelFill(&shape);
+            }
+        }
+        //Stroke
+        if (flags & (RenderUpdateFlag::Stroke | RenderUpdateFlag::Transform)) {
+            if (strokeWidth > 0.0f) {
+                shapeResetStroke(&shape, rshape, transform);
+                if (!shapeGenStrokeRle(&shape, rshape, transform, clipRegion, bbox, mpool, tid)) goto err;
+
+                if (auto fill = rshape->strokeFill()) {
+                    auto ctable = (flags & RenderUpdateFlag::GradientStroke) ? true : false;
+                    if (ctable) shapeResetStrokeFill(&shape);
+                    if (!shapeGenStrokeFillColors(&shape, fill, transform, surface, opacity, ctable)) goto err;
+                } else {
+                    shapeDelStrokeFill(&shape);
+                }
+            } else {
+                shapeDelStroke(&shape);
+            }
+        }
+
+        //Clear current task memorypool here if the clippers would use the same memory pool
+        shapeDelOutline(&shape, mpool, tid);
+
+        //Clip Path
+        for (auto clip = clips.data; clip < clips.end(); ++clip) {
+            auto clipper = static_cast<SwTask*>(*clip);
+            //Clip shape rle
+            if (shape.rle && !clipper->clip(shape.rle)) goto err;
+            //Clip stroke rle
+            if (shape.strokeRle && !clipper->clip(shape.strokeRle)) goto err;
+        }
+        return;
+
+    err:
+        shapeReset(&shape);
+        shapeDelOutline(&shape, mpool, tid);
+    }
+
+    bool dispose() override
+    {
+       shapeFree(&shape);
+       return true;
+    }
+};
+
+
+struct SwSceneTask : SwTask
+{
+    Array<RenderData> scene;    //list of paints render data (SwTask)
+    SwRleData* sceneRle = nullptr;
+
+    bool clip(SwRleData* target) override
+    {
+        //Only one shape
+        if (scene.count == 1) {
+            return static_cast<SwTask*>(*scene.data)->clip(target);
+        }
+
+        //More than one shapes
+        if (sceneRle) rleClipPath(target, sceneRle);
+        else TVGLOG("SW_ENGINE", "No clippers in a scene?");
+
+        return true;
+    }
+
+    SwRleData* rle() override
+    {
+        return sceneRle;
+    }
+
+    void run(unsigned tid) override
+    {
+        //TODO: Skip the run if the scene hans't changed.
+        if (!sceneRle) sceneRle = static_cast<SwRleData*>(calloc(1, sizeof(SwRleData)));
+        else rleReset(sceneRle);
+
+        //Merge shapes if it has more than one shapes
+        if (scene.count > 1) {
+            //Merge first two clippers
+            auto clipper1 = static_cast<SwTask*>(*scene.data);
+            auto clipper2 = static_cast<SwTask*>(*(scene.data + 1));
+
+            rleMerge(sceneRle, clipper1->rle(), clipper2->rle());
+
+            //Unify the remained clippers
+            for (auto rd = scene.data + 2; rd < scene.end(); ++rd) {
+                auto clipper = static_cast<SwTask*>(*rd);
+                rleMerge(sceneRle, sceneRle, clipper->rle());
+            }
+        }
+    }
+
+    bool dispose() override
+    {
+        rleFree(sceneRle);
+        return true;
+    }
+};
+
+
+struct SwImageTask : SwTask
+{
+    SwImage image;
+    Surface* source;                            //Image source
+    const RenderMesh* mesh = nullptr;           //Should be valid ptr in action
+
+    bool clip(SwRleData* target) override
+    {
+        TVGERR("SW_ENGINE", "Image is used as ClipPath?");
+        return true;
+    }
+
+    SwRleData* rle() override
+    {
+        TVGERR("SW_ENGINE", "Image is used as Scene ClipPath?");
+        return nullptr;
+    }
+
+    void run(unsigned tid) override
+    {
+        auto clipRegion = bbox;
+
+        //Convert colorspace if it's not aligned.
+        if (source->owner) {
+            if (source->cs != surface->cs) rasterConvertCS(source, surface->cs);
+            if (!source->premultiplied) rasterPremultiply(source);
+        }
+
+        image.data = source->data;
+        image.w = source->w;
+        image.h = source->h;
+        image.stride = source->stride;
+        image.channelSize = source->channelSize;
+
+        //Invisible shape turned to visible by alpha.
+        if ((flags & (RenderUpdateFlag::Image | RenderUpdateFlag::Transform | RenderUpdateFlag::Color)) && (opacity > 0)) {
+            imageReset(&image);
+            if (!image.data || image.w == 0 || image.h == 0) goto end;
+
+            if (!imagePrepare(&image, mesh, transform, clipRegion, bbox, mpool, tid)) goto end;
+
+            // TODO: How do we clip the triangle mesh? Only clip non-meshed images for now
+            if (mesh->triangleCnt == 0 && clips.count > 0) {
+                if (!imageGenRle(&image, bbox, false)) goto end;
+                if (image.rle) {
+                    //Clear current task memorypool here if the clippers would use the same memory pool
+                    imageDelOutline(&image, mpool, tid);
+                    for (auto clip = clips.data; clip < clips.end(); ++clip) {
+                        auto clipper = static_cast<SwTask*>(*clip);
+                        if (!clipper->clip(image.rle)) goto err;
+                    }
+                    return;
+                }
+            }
+        }
+        goto end;
+    err:
+        rleReset(image.rle);
+    end:
+        imageDelOutline(&image, mpool, tid);
+    }
+
+    bool dispose() override
+    {
+       imageFree(&image);
+       return true;
+    }
+};
+
+
+static void _termEngine()
+{
+    if (rendererCnt > 0) return;
+
+    mpoolTerm(globalMpool);
+    globalMpool = nullptr;
+}
+
+
+static void _renderFill(SwShapeTask* task, SwSurface* surface, uint8_t opacity)
+{
+    uint8_t r, g, b, a;
+    if (auto fill = task->rshape->fill) {
+        rasterGradientShape(surface, &task->shape, fill->identifier());
+    } else {
+        task->rshape->fillColor(&r, &g, &b, &a);
+        a = MULTIPLY(opacity, a);
+        if (a > 0) rasterShape(surface, &task->shape, r, g, b, a);
+    }
+}
+
+static void _renderStroke(SwShapeTask* task, SwSurface* surface, uint8_t opacity)
+{
+    uint8_t r, g, b, a;
+    if (auto strokeFill = task->rshape->strokeFill()) {
+        rasterGradientStroke(surface, &task->shape, strokeFill->identifier());
+    } else {
+        if (task->rshape->strokeColor(&r, &g, &b, &a)) {
+            a = MULTIPLY(opacity, a);
+            if (a > 0) rasterStroke(surface, &task->shape, r, g, b, a);
+        }
+    }
+}
+
+/************************************************************************/
+/* External Class Implementation                                        */
+/************************************************************************/
+
+SwRenderer::~SwRenderer()
+{
+    clearCompositors();
+
+    delete(surface);
+
+    if (!sharedMpool) mpoolTerm(mpool);
+
+    --rendererCnt;
+
+    if (rendererCnt == 0 && initEngineCnt == 0) _termEngine();
+}
+
+
+bool SwRenderer::clear()
+{
+    for (auto task = tasks.data; task < tasks.end(); ++task) {
+        if ((*task)->disposed) {
+            delete(*task);
+        } else {
+            (*task)->done();
+            (*task)->pushed = false;
+        }
+    }
+    tasks.clear();
+
+    if (!sharedMpool) mpoolClear(mpool);
+
+    if (surface) {
+        vport.x = vport.y = 0;
+        vport.w = surface->w;
+        vport.h = surface->h;
+    }
+
+    return true;
+}
+
+
+bool SwRenderer::sync()
+{
+    return true;
+}
+
+
+RenderRegion SwRenderer::viewport()
+{
+    return vport;
+}
+
+
+bool SwRenderer::viewport(const RenderRegion& vp)
+{
+    vport = vp;
+    return true;
+}
+
+
+bool SwRenderer::target(pixel_t* data, uint32_t stride, uint32_t w, uint32_t h, ColorSpace cs)
+{
+    if (!data || stride == 0 || w == 0 || h == 0 || w > stride) return false;
+
+    if (!surface) surface = new SwSurface;
+
+    surface->data = data;
+    surface->stride = stride;
+    surface->w = w;
+    surface->h = h;
+    surface->cs = cs;
+    surface->channelSize = CHANNEL_SIZE(cs);
+    surface->premultiplied = true;
+    surface->owner = true;
+
+    vport.x = vport.y = 0;
+    vport.w = surface->w;
+    vport.h = surface->h;
+
+    return rasterCompositor(surface);
+}
+
+
+bool SwRenderer::preRender()
+{
+    return rasterClear(surface, 0, 0, surface->w, surface->h);
+}
+
+
+void SwRenderer::clearCompositors()
+{
+    //Free Composite Caches
+    for (auto comp = compositors.data; comp < compositors.end(); ++comp) {
+        free((*comp)->compositor->image.data);
+        delete((*comp)->compositor);
+        delete(*comp);
+    }
+    compositors.reset();
+}
+
+
+bool SwRenderer::postRender()
+{
+    //Unmultiply alpha if needed
+    if (surface->cs == ColorSpace::ABGR8888S || surface->cs == ColorSpace::ARGB8888S) {
+        rasterUnpremultiply(surface);
+    }
+
+    for (auto task = tasks.data; task < tasks.end(); ++task) {
+        if ((*task)->disposed) delete(*task);
+        else (*task)->pushed = false;
+    }
+    tasks.clear();
+
+    clearCompositors();
+    return true;
+}
+
+
+bool SwRenderer::renderImage(RenderData data)
+{
+    auto task = static_cast<SwImageTask*>(data);
+    task->done();
+
+    if (task->opacity == 0) return true;
+
+    return rasterImage(surface, &task->image, task->mesh, task->transform, task->bbox, task->opacity);
+}
+
+
+bool SwRenderer::renderShape(RenderData data)
+{
+    auto task = static_cast<SwShapeTask*>(data);
+    if (!task) return false;
+
+    task->done();
+
+    if (task->opacity == 0) return true;
+
+    //Main raster stage
+    if (task->rshape->stroke && task->rshape->stroke->strokeFirst) {
+        _renderStroke(task, surface, task->opacity);
+        _renderFill(task, surface, task->opacity);
+    } else {
+        _renderFill(task, surface, task->opacity);
+        _renderStroke(task, surface, task->opacity);
+    }
+
+    return true;
+}
+
+
+bool SwRenderer::blend(BlendMethod method)
+{
+    if (surface->blendMethod == method) return true;
+    surface->blendMethod = method;
+
+    switch (method) {
+        case BlendMethod::Add:
+            surface->blender = opBlendAdd;
+            break;
+        case BlendMethod::Screen:
+            surface->blender = opBlendScreen;
+            break;
+        case BlendMethod::Multiply:
+            surface->blender = opBlendMultiply;
+            break;
+        case BlendMethod::Overlay:
+            surface->blender = opBlendOverlay;
+            break;
+        case BlendMethod::Difference:
+            surface->blender = opBlendDifference;
+            break;
+        case BlendMethod::Exclusion:
+            surface->blender = opBlendExclusion;
+            break;
+        case BlendMethod::SrcOver:
+            surface->blender = opBlendSrcOver;
+            break;
+        case BlendMethod::Darken:
+            surface->blender = opBlendDarken;
+            break;
+        case BlendMethod::Lighten:
+            surface->blender = opBlendLighten;
+            break;
+        case BlendMethod::ColorDodge:
+            surface->blender = opBlendColorDodge;
+            break;
+        case BlendMethod::ColorBurn:
+            surface->blender = opBlendColorBurn;
+            break;
+        case BlendMethod::HardLight:
+            surface->blender = opBlendHardLight;
+            break;
+        case BlendMethod::SoftLight:
+            surface->blender = opBlendSoftLight;
+            break;
+        default:
+            surface->blender = nullptr;
+            break;
+    }
+    return false;
+}
+
+
+RenderRegion SwRenderer::region(RenderData data)
+{
+    return static_cast<SwTask*>(data)->bounds();
+}
+
+
+bool SwRenderer::beginComposite(Compositor* cmp, CompositeMethod method, uint8_t opacity)
+{
+    if (!cmp) return false;
+    auto p = static_cast<SwCompositor*>(cmp);
+
+    p->method = method;
+    p->opacity = opacity;
+
+    //Current Context?
+    if (p->method != CompositeMethod::None) {
+        surface = p->recoverSfc;
+        surface->compositor = p;
+    }
+
+    return true;
+}
+
+
+bool SwRenderer::mempool(bool shared)
+{
+    if (shared == sharedMpool) return true;
+
+    if (shared) {
+        if (!sharedMpool) {
+            if (!mpoolTerm(mpool)) return false;
+            mpool = globalMpool;
+        }
+    } else {
+        if (sharedMpool) mpool = mpoolInit(threadsCnt);
+    }
+
+    sharedMpool = shared;
+
+    if (mpool) return true;
+    return false;
+}
+
+
+Compositor* SwRenderer::target(const RenderRegion& region, ColorSpace cs)
+{
+    auto x = region.x;
+    auto y = region.y;
+    auto w = region.w;
+    auto h = region.h;
+    auto sw = static_cast<int32_t>(surface->w);
+    auto sh = static_cast<int32_t>(surface->h);
+
+    //Out of boundary
+    if (x >= sw || y >= sh || x + w < 0 || y + h < 0) return nullptr;
+
+    SwSurface* cmp = nullptr;
+
+    auto reqChannelSize = CHANNEL_SIZE(cs);
+
+    //Use cached data
+    for (auto p = compositors.data; p < compositors.end(); ++p) {
+        if ((*p)->compositor->valid && (*p)->compositor->image.channelSize == reqChannelSize) {
+            cmp = *p;
+            break;
+        }
+    }
+
+    //New Composition
+    if (!cmp) {
+        cmp = new SwSurface;
+
+        //Inherits attributes from main surface
+        *cmp = *surface;
+
+        cmp->compositor = new SwCompositor;
+
+        //TODO: We can optimize compositor surface size from (surface->stride x surface->h) to Parameter(w x h)
+        cmp->compositor->image.data = (pixel_t*)malloc(reqChannelSize * surface->stride * surface->h);
+        cmp->channelSize = cmp->compositor->image.channelSize = reqChannelSize;
+
+        compositors.push(cmp);
+    }
+
+    //Boundary Check
+    if (x + w > sw) w = (sw - x);
+    if (y + h > sh) h = (sh - y);
+
+    cmp->compositor->recoverSfc = surface;
+    cmp->compositor->recoverCmp = surface->compositor;
+    cmp->compositor->valid = false;
+    cmp->compositor->bbox.min.x = x;
+    cmp->compositor->bbox.min.y = y;
+    cmp->compositor->bbox.max.x = x + w;
+    cmp->compositor->bbox.max.y = y + h;
+    cmp->compositor->image.stride = surface->stride;
+    cmp->compositor->image.w = surface->w;
+    cmp->compositor->image.h = surface->h;
+    cmp->compositor->image.direct = true;
+
+    cmp->data = cmp->compositor->image.data;
+    cmp->w = cmp->compositor->image.w;
+    cmp->h = cmp->compositor->image.h;
+
+    rasterClear(cmp, x, y, w, h);
+
+    //Switch render target
+    surface = cmp;
+
+    return cmp->compositor;
+}
+
+
+bool SwRenderer::endComposite(Compositor* cmp)
+{
+    if (!cmp) return false;
+
+    auto p = static_cast<SwCompositor*>(cmp);
+    p->valid = true;
+
+    //Recover Context
+    surface = p->recoverSfc;
+    surface->compositor = p->recoverCmp;
+
+    //Default is alpha blending
+    if (p->method == CompositeMethod::None) {
+        return rasterImage(surface, &p->image, nullptr, nullptr, p->bbox, p->opacity);
+    }
+
+    return true;
+}
+
+
+ColorSpace SwRenderer::colorSpace()
+{
+    if (surface) return surface->cs;
+    else return ColorSpace::Unsupported;
+}
+
+
+bool SwRenderer::dispose(RenderData data)
+{
+    auto task = static_cast<SwTask*>(data);
+    if (!task) return true;
+    task->done();
+    task->dispose();
+
+    if (task->pushed) task->disposed = true;
+    else delete(task);
+
+    return true;
+}
+
+
+void* SwRenderer::prepareCommon(SwTask* task, const RenderTransform* transform, const Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags)
+{
+    if (!surface) return task;
+    if (flags == RenderUpdateFlag::None) return task;
+
+    //Finish previous task if it has duplicated request.
+    task->done();
+
+    //TODO: Failed threading them. It would be better if it's possible.
+    //See: https://github.com/thorvg/thorvg/issues/1409
+    //Guarantee composition targets get ready.
+    for (auto clip = clips.data; clip < clips.end(); ++clip) {
+        static_cast<SwTask*>(*clip)->done();
+    }
+
+    task->clips = clips;
+
+    if (transform) {
+        if (!task->transform) task->transform = static_cast<Matrix*>(malloc(sizeof(Matrix)));
+        *task->transform = transform->m;
+    } else {
+        if (task->transform) free(task->transform);
+        task->transform = nullptr;
+    }
+
+    //zero size?
+    if (task->transform) {
+        if (task->transform->e11 == 0.0f && task->transform->e12 == 0.0f) return task; //zero width
+        if (task->transform->e21 == 0.0f && task->transform->e22 == 0.0f) return task; //zero height
+    }
+
+    task->opacity = opacity;
+    task->surface = surface;
+    task->mpool = mpool;
+    task->flags = flags;
+    task->bbox.min.x = mathMax(static_cast<SwCoord>(0), static_cast<SwCoord>(vport.x));
+    task->bbox.min.y = mathMax(static_cast<SwCoord>(0), static_cast<SwCoord>(vport.y));
+    task->bbox.max.x = mathMin(static_cast<SwCoord>(surface->w), static_cast<SwCoord>(vport.x + vport.w));
+    task->bbox.max.y = mathMin(static_cast<SwCoord>(surface->h), static_cast<SwCoord>(vport.y + vport.h));
+
+    if (!task->pushed) {
+        task->pushed = true;
+        tasks.push(task);
+    }
+
+    TaskScheduler::request(task);
+
+    return task;
+}
+
+
+RenderData SwRenderer::prepare(Surface* surface, const RenderMesh* mesh, RenderData data, const RenderTransform* transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags)
+{
+    //prepare task
+    auto task = static_cast<SwImageTask*>(data);
+    if (!task) task = new SwImageTask;
+    task->source = surface;
+    task->mesh = mesh;
+    return prepareCommon(task, transform, clips, opacity, flags);
+}
+
+
+RenderData SwRenderer::prepare(const Array<RenderData>& scene, RenderData data, const RenderTransform* transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags)
+{
+    //prepare task
+    auto task = static_cast<SwSceneTask*>(data);
+    if (!task) task = new SwSceneTask;
+    task->scene = scene;
+
+    //TODO: Failed threading them. It would be better if it's possible.
+    //See: https://github.com/thorvg/thorvg/issues/1409
+    //Guarantee composition targets get ready.
+    for (auto task = scene.data; task < scene.end(); ++task) {
+        static_cast<SwTask*>(*task)->done();
+    }
+    return prepareCommon(task, transform, clips, opacity, flags);
+}
+
+
+RenderData SwRenderer::prepare(const RenderShape& rshape, RenderData data, const RenderTransform* transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags, bool clipper)
+{
+    //prepare task
+    auto task = static_cast<SwShapeTask*>(data);
+    if (!task) {
+        task = new SwShapeTask;
+        task->rshape = &rshape;
+    }
+    task->clipper = clipper;
+
+    return prepareCommon(task, transform, clips, opacity, flags);
+}
+
+
+SwRenderer::SwRenderer():mpool(globalMpool)
+{
+}
+
+
+bool SwRenderer::init(uint32_t threads)
+{
+    if ((initEngineCnt++) > 0) return true;
+
+    threadsCnt = threads;
+
+    //Share the memory pool among the renderer
+    globalMpool = mpoolInit(threads);
+    if (!globalMpool) {
+        --initEngineCnt;
+        return false;
+    }
+
+    return true;
+}
+
+
+int32_t SwRenderer::init()
+{
+    return initEngineCnt;
+}
+
+
+bool SwRenderer::term()
+{
+    if ((--initEngineCnt) > 0) return true;
+
+    initEngineCnt = 0;
+
+   _termEngine();
+
+    return true;
+}
+
+SwRenderer* SwRenderer::gen()
+{
+    ++rendererCnt;
+    return new SwRenderer();
+}