diff --git a/src/renderer/sw_engine/tvgSwCommon.h b/src/renderer/sw_engine/tvgSwCommon.h
index 1a8fdc6b..7e532a85 100644
--- a/src/renderer/sw_engine/tvgSwCommon.h
+++ b/src/renderer/sw_engine/tvgSwCommon.h
@@ -23,6 +23,7 @@
 #ifndef _TVG_SW_COMMON_H_
 #define _TVG_SW_COMMON_H_
 
+#include <algorithm>
 #include "tvgCommon.h"
 #include "tvgMath.h"
 #include "tvgRender.h"
@@ -117,22 +118,47 @@ struct SwSpan
     uint16_t x, y;
     uint16_t len;
     uint8_t coverage;
+
+    void fetch(const RenderRegion& bbox, int32_t& x, int32_t& len) const
+    {
+        x = std::max((int32_t)this->x, bbox.min.x);
+        len = std::min((int32_t)(this->x + this->len), bbox.max.x) - x;
+    }
 };
 
+
 struct SwRle
 {
     Array<SwSpan> spans;
 
-    bool invalid() const
+    const SwSpan* fetch(const RenderRegion& bbox, const SwSpan** end) const
     {
-        return spans.empty();
+        return fetch(bbox.min.y, bbox.max.y, end);
     }
 
-    bool valid() const
+    const SwSpan* fetch(int32_t min, uint32_t max, const SwSpan** end) const
     {
-        return !invalid();
+        const SwSpan* begin;
+
+        if (min <= spans.first().y) {
+            begin = spans.begin();
+        } else {
+            auto comp = [](const SwSpan& span, int y) { return span.y < y; };
+            begin = lower_bound(spans.begin(), spans.end(), min, comp);
+        }
+        if (end) {
+            if (max >= spans.last().y) {
+                *end = spans.end();
+            } else {
+                auto comp = [](int y, const SwSpan& span) { return y < span.y; };
+                *end = upper_bound(spans.begin(), spans.end(), max, comp);
+            }
+        }
+        return begin;
     }
 
+    bool invalid() const { return spans.empty(); }
+    bool valid() const { return !invalid(); }
     uint32_t size() const { return spans.count; }
     SwSpan* data() const { return spans.data; }
 };
@@ -566,11 +592,11 @@ SwOutline* mpoolReqDashOutline(SwMpool* mpool, unsigned idx);
 void mpoolRetDashOutline(SwMpool* mpool, unsigned idx);
 
 bool rasterCompositor(SwSurface* surface);
-bool rasterGradientShape(SwSurface* surface, SwShape* shape, const Fill* fdata, uint8_t opacity);
-bool rasterShape(SwSurface* surface, SwShape* shape, RenderColor& c);
+bool rasterGradientShape(SwSurface* surface, SwShape* shape, const RenderRegion& bbox, const Fill* fdata, uint8_t opacity);
+bool rasterShape(SwSurface* surface, SwShape* shape, const RenderRegion& bbox, RenderColor& c);
 bool rasterImage(SwSurface* surface, SwImage* image, const Matrix& transform, const RenderRegion& bbox, uint8_t opacity);
-bool rasterStroke(SwSurface* surface, SwShape* shape, RenderColor& c);
-bool rasterGradientStroke(SwSurface* surface, SwShape* shape, const Fill* fdata, uint8_t opacity);
+bool rasterStroke(SwSurface* surface, SwShape* shape, const RenderRegion& bbox, RenderColor& c);
+bool rasterGradientStroke(SwSurface* surface, SwShape* shape, const RenderRegion& bbox, const Fill* fdata, uint8_t opacity);
 bool rasterClear(SwSurface* surface, uint32_t x, uint32_t y, uint32_t w, uint32_t h, pixel_t val = 0);
 void rasterPixel32(uint32_t *dst, uint32_t val, uint32_t offset, int32_t len);
 void rasterTranslucentPixel32(uint32_t* dst, uint32_t* src, uint32_t len, uint8_t opacity);
diff --git a/src/renderer/sw_engine/tvgSwRaster.cpp b/src/renderer/sw_engine/tvgSwRaster.cpp
index 16d8f45d..1a052a7c 100644
--- a/src/renderer/sw_engine/tvgSwRaster.cpp
+++ b/src/renderer/sw_engine/tvgSwRaster.cpp
@@ -472,37 +472,44 @@ static bool _rasterRect(SwSurface* surface, const RenderRegion& bbox, const Rend
 /* Rle                                                                  */
 /************************************************************************/
 
-static bool _rasterCompositeMaskedRle(SwSurface* surface, SwRle* rle, SwMask maskOp, uint8_t a)
+static bool _rasterCompositeMaskedRle(SwSurface* surface, SwRle* rle, const RenderRegion& bbox, SwMask maskOp, uint8_t a)
 {
     auto cbuffer = surface->compositor->image.buf8;
     auto cstride = surface->compositor->image.stride;
+    const SwSpan* end;
+    int32_t x, len;
     uint8_t src;
 
-    ARRAY_FOREACH(span, rle->spans) {
-        auto cmp = &cbuffer[span->y * cstride + span->x];
+    for (auto span = rle->fetch(bbox, &end); span < end; ++span) {
+        span->fetch(bbox, x, len);
+        auto cmp = &cbuffer[span->y * cstride + x];
         if (span->coverage == 255) src = a;
         else src = MULTIPLY(a, span->coverage);
         auto ialpha = 255 - src;
-        for (auto x = 0; x < span->len; ++x, ++cmp) {
+        for (auto x = 0; x < len; ++x, ++cmp) {
             *cmp = maskOp(src, *cmp, ialpha);
         }
     }
+
     return _compositeMaskImage(surface, &surface->compositor->image, surface->compositor->bbox);
 }
 
 
-static bool _rasterDirectMaskedRle(SwSurface* surface, SwRle* rle, SwMask maskOp, uint8_t a)
+static bool _rasterDirectMaskedRle(SwSurface* surface, SwRle* rle, const RenderRegion& bbox, SwMask maskOp, uint8_t a)
 {
     auto cbuffer = surface->compositor->image.buf8;
     auto cstride = surface->compositor->image.stride;
+    const SwSpan* end;
+    int32_t x, len;
     uint8_t src;
 
-    ARRAY_FOREACH(span, rle->spans) {
-        auto cmp = &cbuffer[span->y * cstride + span->x];
-        auto dst = &surface->buf8[span->y * surface->stride + span->x];
+    for (auto span = rle->fetch(bbox, &end); span < end; ++span) {
+        span->fetch(bbox, x, len);
+        auto cmp = &cbuffer[span->y * cstride + x];
+        auto dst = &surface->buf8[span->y * surface->stride + x];
         if (span->coverage == 255) src = a;
         else src = MULTIPLY(a, span->coverage);
-        for (auto x = 0; x < span->len; ++x, ++cmp, ++dst) {
+        for (auto x = 0; x < len; ++x, ++cmp, ++dst) {
             auto tmp = maskOp(src, *cmp, 0);     //not use alpha
             *dst = tmp + MULTIPLY(*dst, ~tmp);
         }
@@ -511,7 +518,7 @@ static bool _rasterDirectMaskedRle(SwSurface* surface, SwRle* rle, SwMask maskOp
 }
 
 
-static bool _rasterMaskedRle(SwSurface* surface, SwRle* rle, const RenderColor& c)
+static bool _rasterMaskedRle(SwSurface* surface, SwRle* rle, const RenderRegion& bbox, const RenderColor& c)
 {
     TVGLOG("SW_ENGINE", "Masked(%d) Rle", (int)surface->compositor->method);
 
@@ -519,30 +526,33 @@ static bool _rasterMaskedRle(SwSurface* surface, SwRle* rle, const RenderColor&
     if (surface->channelSize != sizeof(uint8_t)) return false;
 
     auto maskOp = _getMaskOp(surface->compositor->method);
-    if (_direct(surface->compositor->method)) return _rasterDirectMaskedRle(surface, rle, maskOp, c.a);
-    else return _rasterCompositeMaskedRle(surface, rle, maskOp, c.a);
+    if (_direct(surface->compositor->method)) return _rasterDirectMaskedRle(surface, rle, bbox, maskOp, c.a);
+    else return _rasterCompositeMaskedRle(surface, rle, bbox, maskOp, c.a);
     return false;
 }
 
 
-static bool _rasterMattedRle(SwSurface* surface, SwRle* rle, const RenderColor& c)
+static bool _rasterMattedRle(SwSurface* surface, SwRle* rle, const RenderRegion& bbox, const RenderColor& c)
 {
     TVGLOG("SW_ENGINE", "Matted(%d) Rle", (int)surface->compositor->method);
 
     auto cbuffer = surface->compositor->image.buf8;
     auto csize = surface->compositor->image.channelSize;
     auto alpha = surface->alpha(surface->compositor->method);
+    const SwSpan* end;
+    int32_t x, len;
 
     //32bit channels
     if (surface->channelSize == sizeof(uint32_t)) {
         uint32_t src;
         auto color = surface->join(c.r, c.g, c.b, c.a);
-        ARRAY_FOREACH(span, rle->spans) {
-            auto dst = &surface->buf32[span->y * surface->stride + span->x];
-            auto cmp = &cbuffer[(span->y * surface->compositor->image.stride + span->x) * csize];
+        for (auto span = rle->fetch(bbox, &end); span < end; ++span) {
+            span->fetch(bbox, x, len);
+            auto dst = &surface->buf32[span->y * surface->stride + x];
+            auto cmp = &cbuffer[(span->y * surface->compositor->image.stride + x) * csize];
             if (span->coverage == 255) src = color;
             else src = ALPHA_BLEND(color, span->coverage);
-            for (uint32_t x = 0; x < span->len; ++x, ++dst, cmp += csize) {
+            for (auto x = 0; x < len; ++x, ++dst, cmp += csize) {
                 auto tmp = ALPHA_BLEND(src, alpha(cmp));
                 *dst = tmp + ALPHA_BLEND(*dst, IA(tmp));
             }
@@ -550,12 +560,13 @@ static bool _rasterMattedRle(SwSurface* surface, SwRle* rle, const RenderColor&
     //8bit grayscale
     } else if (surface->channelSize == sizeof(uint8_t)) {
         uint8_t src;
-        ARRAY_FOREACH(span, rle->spans) {
-            auto dst = &surface->buf8[span->y * surface->stride + span->x];
-            auto cmp = &cbuffer[(span->y * surface->compositor->image.stride + span->x) * csize];
+        for (auto span = rle->fetch(bbox, &end); span < end; ++span) {
+            span->fetch(bbox, x, len);
+            auto dst = &surface->buf8[span->y * surface->stride + x];
+            auto cmp = &cbuffer[(span->y * surface->compositor->image.stride + x) * csize];
             if (span->coverage == 255) src = c.a;
             else src = MULTIPLY(c.a, span->coverage);
-            for (uint32_t x = 0; x < span->len; ++x, ++dst, cmp += csize) {
+            for (auto x = 0; x < len; ++x, ++dst, cmp += csize) {
                 *dst = INTERPOLATE8(src, *dst, alpha(cmp));
             }
         }
@@ -564,20 +575,23 @@ static bool _rasterMattedRle(SwSurface* surface, SwRle* rle, const RenderColor&
 }
 
 
-static bool _rasterBlendingRle(SwSurface* surface, const SwRle* rle, const RenderColor& c)
+static bool _rasterBlendingRle(SwSurface* surface, const SwRle* rle, const RenderRegion& bbox, const RenderColor& c)
 {
     if (surface->channelSize != sizeof(uint32_t)) return false;
 
     auto color = surface->join(c.r, c.g, c.b, c.a);
+    const SwSpan* end;
+    int32_t x, len;
 
-    ARRAY_FOREACH(span, rle->spans) {
-        auto dst = &surface->buf32[span->y * surface->stride + span->x];
+    for (auto span = rle->fetch(bbox, &end); span < end; ++span) {
+        span->fetch(bbox, x, len);
+        auto dst = &surface->buf32[span->y * surface->stride + x];
         if (span->coverage == 255) {
-            for (uint32_t x = 0; x < span->len; ++x, ++dst) {
+            for (auto x = 0; x < len; ++x, ++dst) {
                 *dst = surface->blender(color, *dst, 255);
             }
         } else {
-            for (uint32_t x = 0; x < span->len; ++x, ++dst) {
+            for (auto x = 0; x < len; ++x, ++dst) {
                 auto tmp = surface->blender(color, *dst, 255);
                 *dst = INTERPOLATE(tmp, *dst, span->coverage);
             }
@@ -587,44 +601,47 @@ static bool _rasterBlendingRle(SwSurface* surface, const SwRle* rle, const Rende
 }
 
 
-static bool _rasterTranslucentRle(SwSurface* surface, const SwRle* rle, const RenderColor& c)
+static bool _rasterTranslucentRle(SwSurface* surface, const SwRle* rle, const RenderRegion& bbox, const RenderColor& c)
 {
 #if defined(THORVG_AVX_VECTOR_SUPPORT)
-    return avxRasterTranslucentRle(surface, rle, c);
+    return avxRasterTranslucentRle(surface, rle, bbox, c);
 #elif defined(THORVG_NEON_VECTOR_SUPPORT)
-    return neonRasterTranslucentRle(surface, rle, c);
+    return neonRasterTranslucentRle(surface, rle, bbox, c);
 #else
-    return cRasterTranslucentRle(surface, rle, c);
+    return cRasterTranslucentRle(surface, rle, bbox, c);
 #endif
 }
 
 
-static bool _rasterSolidRle(SwSurface* surface, const SwRle* rle, const RenderColor& c)
+static bool _rasterSolidRle(SwSurface* surface, const SwRle* rle, const RenderRegion& bbox, const RenderColor& c)
 {
+    const SwSpan* end;
+    int32_t x, len;
+
     //32bit channels
     if (surface->channelSize == sizeof(uint32_t)) {
         auto color = surface->join(c.r, c.g, c.b, 255);
-        ARRAY_FOREACH(span, rle->spans) {
-            if (span->coverage == 255) {
-                rasterPixel32(surface->buf32 + span->y * surface->stride, color, span->x, span->len);
-            } else {
-                auto dst = &surface->buf32[span->y * surface->stride + span->x];
+        for (auto span = rle->fetch(bbox, &end); span < end; ++span) {
+            span->fetch(bbox, x, len);
+            if (span->coverage == 255) rasterPixel32(surface->buf32 + span->y * surface->stride, color, x, len);
+            else {
+                auto dst = &surface->buf32[span->y * surface->stride + x];
                 auto src = ALPHA_BLEND(color, span->coverage);
                 auto ialpha = 255 - span->coverage;
-                for (uint32_t x = 0; x < span->len; ++x, ++dst) {
+                for (auto x = 0; x < len; ++x, ++dst) {
                     *dst = src + ALPHA_BLEND(*dst, ialpha);
                 }
             }
         }
     //8bit grayscale
     } else if (surface->channelSize == sizeof(uint8_t)) {
-        ARRAY_FOREACH(span, rle->spans) {
-            if (span->coverage == 255) {
-                rasterGrayscale8(surface->buf8, span->coverage, span->y * surface->stride + span->x, span->len);
-            } else {
-                auto dst = &surface->buf8[span->y * surface->stride + span->x];
+        for (auto span = rle->fetch(bbox, &end); span < end; ++span) {
+            span->fetch(bbox, x, len);
+            if (span->coverage == 255) rasterGrayscale8(surface->buf8, span->coverage, span->y * surface->stride + x, len);
+            else {
+                auto dst = &surface->buf8[span->y * surface->stride + x];
                 auto ialpha = 255 - span->coverage;
-                for (uint32_t x = 0; x < span->len; ++x, ++dst) {
+                for (auto x = 0; x < len; ++x, ++dst) {
                     *dst = span->coverage + MULTIPLY(*dst, ialpha);
                 }
             }
@@ -634,18 +651,18 @@ static bool _rasterSolidRle(SwSurface* surface, const SwRle* rle, const RenderCo
 }
 
 
-static bool _rasterRle(SwSurface* surface, SwRle* rle, const RenderColor& c)
+static bool _rasterRle(SwSurface* surface, SwRle* rle, const RenderRegion& bbox, const RenderColor& c)
 {
     if (!rle || rle->invalid()) return false;
 
     if (_compositing(surface)) {
-        if (_matting(surface)) return _rasterMattedRle(surface, rle, c);
-        else return _rasterMaskedRle(surface, rle, c);
+        if (_matting(surface)) return _rasterMattedRle(surface, rle, bbox, c);
+        else return _rasterMaskedRle(surface, rle, bbox, c);
     } else if (_blending(surface)) {
-        return _rasterBlendingRle(surface, rle, c);
+        return _rasterBlendingRle(surface, rle, bbox, c);
     } else {
-        if (c.a == 255) return _rasterSolidRle(surface, rle, c);
-        else return _rasterTranslucentRle(surface, rle, c);
+        if (c.a == 255) return _rasterSolidRle(surface, rle, bbox, c);
+        else return _rasterTranslucentRle(surface, rle, bbox, c);
     }
     return false;
 }
@@ -781,26 +798,29 @@ static bool _scaledRleImage(SwSurface* surface, const SwImage* image, const Matr
 /* RLE Direct Image                                                     */
 /************************************************************************/
 
-static bool _rasterDirectMattedRleImage(SwSurface* surface, const SwImage* image, uint8_t opacity)
+static bool _rasterDirectMattedRleImage(SwSurface* surface, const SwImage* image, const RenderRegion& bbox, uint8_t opacity)
 {
     TVGLOG("SW_ENGINE", "Direct Matted(%d) Rle Image", (int)surface->compositor->method);
 
     auto csize = surface->compositor->image.channelSize;
     auto cbuffer = surface->compositor->image.buf8;
     auto alpha = surface->alpha(surface->compositor->method);
+    const SwSpan* end;
+    int32_t x, len;
 
-    ARRAY_FOREACH(span, image->rle->spans) {
-        auto dst = &surface->buf32[span->y * surface->stride + span->x];
-        auto cmp = &cbuffer[(span->y * surface->compositor->image.stride + span->x) * csize];
-        auto img = image->buf32 + (span->y + image->oy) * image->stride + (span->x + image->ox);
+    for (auto span = image->rle->fetch(bbox, &end); span < end; ++span) {
+        span->fetch(bbox, x, len);
+        auto dst = &surface->buf32[span->y * surface->stride + x];
+        auto cmp = &cbuffer[(span->y * surface->compositor->image.stride + x) * csize];
+        auto img = image->buf32 + (span->y + image->oy) * image->stride + (x + image->ox);
         auto a = MULTIPLY(span->coverage, opacity);
         if (a == 255) {
-            for (uint32_t x = 0; x < span->len; ++x, ++dst, ++img, cmp += csize) {
+            for (auto x = 0; x < len; ++x, ++dst, ++img, cmp += csize) {
                 auto tmp = ALPHA_BLEND(*img, alpha(cmp));
                 *dst = tmp + ALPHA_BLEND(*dst, IA(tmp));
             }
         } else {
-            for (uint32_t x = 0; x < span->len; ++x, ++dst, ++img, cmp += csize) {
+            for (auto x = 0; x < len; ++x, ++dst, ++img, cmp += csize) {
                 auto tmp = ALPHA_BLEND(*img, MULTIPLY(a, alpha(cmp)));
                 *dst = tmp + ALPHA_BLEND(*dst, IA(tmp));
             }
@@ -810,18 +830,22 @@ static bool _rasterDirectMattedRleImage(SwSurface* surface, const SwImage* image
 }
 
 
-static bool _rasterDirectBlendingRleImage(SwSurface* surface, const SwImage* image, uint8_t opacity)
+static bool _rasterDirectBlendingRleImage(SwSurface* surface, const SwImage* image, const RenderRegion& bbox, uint8_t opacity)
 {
-    ARRAY_FOREACH(span, image->rle->spans) {
-        auto dst = &surface->buf32[span->y * surface->stride + span->x];
-        auto img = image->buf32 + (span->y + image->oy) * image->stride + (span->x + image->ox);
+    const SwSpan* end;
+    int32_t x, len;
+
+    for (auto span = image->rle->fetch(bbox, &end); span < end; ++span) {
+        span->fetch(bbox, x, len);
+        auto dst = &surface->buf32[span->y * surface->stride + x];
+        auto img = image->buf32 + (span->y + image->oy) * image->stride + (x + image->ox);
         auto alpha = MULTIPLY(span->coverage, opacity);
         if (alpha == 255) {
-            for (uint32_t x = 0; x < span->len; ++x, ++dst, ++img) {
+            for (auto x = 0; x < len; ++x, ++dst, ++img) {
                 *dst = surface->blender(*img, *dst, 255);
             }
         } else {
-            for (uint32_t x = 0; x < span->len; ++x, ++dst, ++img) {
+            for (auto x = 0; x < len; ++x, ++dst, ++img) {
                 auto tmp = surface->blender(*img, *dst, 255);
                 *dst = INTERPOLATE(tmp, *dst, MULTIPLY(alpha, A(*img)));
             }
@@ -831,26 +855,30 @@ static bool _rasterDirectBlendingRleImage(SwSurface* surface, const SwImage* ima
 }
 
 
-static bool _rasterDirectRleImage(SwSurface* surface, const SwImage* image, uint8_t opacity)
+static bool _rasterDirectRleImage(SwSurface* surface, const SwImage* image, const RenderRegion& bbox, uint8_t opacity)
 {
-    ARRAY_FOREACH(span, image->rle->spans) {
-        auto dst = &surface->buf32[span->y * surface->stride + span->x];
-        auto img = image->buf32 + (span->y + image->oy) * image->stride + (span->x + image->ox);
+    const SwSpan* end;
+    int32_t x, len;
+
+    for (auto span = image->rle->fetch(bbox, &end); span < end; ++span) {
+        span->fetch(bbox, x, len);
+        auto dst = &surface->buf32[span->y * surface->stride + x];
+        auto img = image->buf32 + (span->y + image->oy) * image->stride + (x + image->ox);
         auto alpha = MULTIPLY(span->coverage, opacity);
-        rasterTranslucentPixel32(dst, img, span->len, alpha);
+        rasterTranslucentPixel32(dst, img, len, alpha);
     }
     return true;
 }
 
 
-static bool _rasterDirectMaskedRleImage(SwSurface* surface, const SwImage* image, uint8_t opacity)
+static bool _rasterDirectMaskedRleImage(SwSurface* surface, const SwImage* image, const RenderRegion& bbox, uint8_t opacity)
 {
     TVGERR("SW_ENGINE", "Not Supported Direct Masked(%d) Rle Image", (int)surface->compositor->method);
     return false;
 }
 
 
-static bool _directRleImage(SwSurface* surface, const SwImage* image, uint8_t opacity)
+static bool _directRleImage(SwSurface* surface, const SwImage* image, const RenderRegion& bbox, uint8_t opacity)
 {
     if (surface->channelSize == sizeof(uint8_t)) {
         TVGERR("SW_ENGINE", "Not supported grayscale rle image!");
@@ -858,12 +886,12 @@ static bool _directRleImage(SwSurface* surface, const SwImage* image, uint8_t op
     }
 
     if (_compositing(surface)) {
-        if (_matting(surface)) return _rasterDirectMattedRleImage(surface, image, opacity);
-        else return _rasterDirectMaskedRleImage(surface, image, opacity);
+        if (_matting(surface)) return _rasterDirectMattedRleImage(surface, image, bbox, opacity);
+        else return _rasterDirectMaskedRleImage(surface, image, bbox, opacity);
     } else if (_blending(surface)) {
-        return _rasterDirectBlendingRleImage(surface, image, opacity);
+        return _rasterDirectBlendingRleImage(surface, image, bbox, opacity);
     } else {
-        return _rasterDirectRleImage(surface, image, opacity);
+        return _rasterDirectRleImage(surface, image, bbox, opacity);
     }
     return false;
 }
@@ -1185,14 +1213,14 @@ static bool _rasterImage(SwSurface* surface, SwImage* image, const Matrix& trans
 {
     //RLE Image
     if (image->rle) {
-        if (image->direct) return _directRleImage(surface, image, opacity);
+        if (image->direct) return _directRleImage(surface, image, bbox, opacity);
         else if (image->scaled) return _scaledRleImage(surface, image, transform, bbox, opacity);
-        else return _rasterTexmapPolygon(surface, image, transform, nullptr, opacity);
+        else return _rasterTexmapPolygon(surface, image, transform, bbox, opacity);
     //Whole Image
     } else {
         if (image->direct) return _directImage(surface, image, bbox, opacity);
         else if (image->scaled) return _scaledImage(surface, image, transform, bbox, opacity);
-        else return _rasterTexmapPolygon(surface, image, transform, &bbox, opacity);
+        else return _rasterTexmapPolygon(surface, image, transform, bbox, opacity);
     }
 }
 
@@ -1666,36 +1694,35 @@ void rasterPremultiply(RenderSurface* surface)
 }
 
 
-bool rasterGradientShape(SwSurface* surface, SwShape* shape, const Fill* fdata, uint8_t opacity)
+bool rasterGradientShape(SwSurface* surface, SwShape* shape, const RenderRegion& bbox, const Fill* fdata, uint8_t opacity)
 {
     if (!shape->fill) return false;
 
     if (auto color = fillFetchSolid(shape->fill, fdata)) {
         auto a = MULTIPLY(color->a, opacity);
         RenderColor c = {color->r, color->g, color->b, a};
-        return a > 0 ? rasterShape(surface, shape, c) : true;
+        return a > 0 ? rasterShape(surface, shape, bbox, c) : true;
     }
 
     auto type = fdata->type();
     if (shape->fastTrack) {
-        if (type == Type::LinearGradient) return _rasterLinearGradientRect(surface, shape->bbox, shape->fill);
-        else if (type == Type::RadialGradient)return _rasterRadialGradientRect(surface, shape->bbox, shape->fill);
+        if (type == Type::LinearGradient) return _rasterLinearGradientRect(surface, bbox, shape->fill);
+        else if (type == Type::RadialGradient)return _rasterRadialGradientRect(surface, bbox, shape->fill);
     } else if (shape->rle && shape->rle->valid()) {
         if (type == Type::LinearGradient) return _rasterLinearGradientRle(surface, shape->rle, shape->fill);
         else if (type == Type::RadialGradient) return _rasterRadialGradientRle(surface, shape->rle, shape->fill);
-    }
-    return false;
+    } return false;
 }
 
 
-bool rasterGradientStroke(SwSurface* surface, SwShape* shape, const Fill* fdata, uint8_t opacity)
+bool rasterGradientStroke(SwSurface* surface, SwShape* shape, const RenderRegion& bbox, const Fill* fdata, uint8_t opacity)
 {
     if (!shape->stroke || !shape->stroke->fill || !shape->strokeRle || shape->strokeRle->invalid()) return false;
 
     if (auto color = fillFetchSolid(shape->stroke->fill, fdata)) {
         RenderColor c = {color->r, color->g, color->b, color->a};
         c.a = MULTIPLY(c.a, opacity);
-        return c.a > 0 ? rasterStroke(surface, shape, c) : true;
+        return c.a > 0 ? rasterStroke(surface, shape, bbox, c) : true;
     }
 
     auto type = fdata->type();
@@ -1705,19 +1732,19 @@ bool rasterGradientStroke(SwSurface* surface, SwShape* shape, const Fill* fdata,
 }
 
 
-bool rasterShape(SwSurface* surface, SwShape* shape, RenderColor& c)
+bool rasterShape(SwSurface* surface, SwShape* shape, const RenderRegion& bbox, RenderColor& c)
 {
     if (c.a < 255) {
         c.r = MULTIPLY(c.r, c.a);
         c.g = MULTIPLY(c.g, c.a);
         c.b = MULTIPLY(c.b, c.a);
     }
-    if (shape->fastTrack) return _rasterRect(surface, shape->bbox, c);
-    else return _rasterRle(surface, shape->rle, c);
+    if (shape->fastTrack) return _rasterRect(surface, bbox, c);
+    else return _rasterRle(surface, shape->rle, bbox, c);
 }
 
 
-bool rasterStroke(SwSurface* surface, SwShape* shape, RenderColor& c)
+bool rasterStroke(SwSurface* surface, SwShape* shape, const RenderRegion& bbox, RenderColor& c)
 {
     if (c.a < 255) {
         c.r = MULTIPLY(c.r, c.a);
@@ -1725,7 +1752,7 @@ bool rasterStroke(SwSurface* surface, SwShape* shape, RenderColor& c)
         c.b = MULTIPLY(c.b, c.a);
     }
 
-    return _rasterRle(surface, shape->strokeRle, c);
+    return _rasterRle(surface, shape->strokeRle, bbox, c);
 }
 
 
@@ -1791,4 +1818,4 @@ void rasterXYFlip(uint32_t* src, uint32_t* dst, int32_t stride, int32_t w, int32
             }
         }
     }
-}
+}
\ No newline at end of file
diff --git a/src/renderer/sw_engine/tvgSwRasterAvx.h b/src/renderer/sw_engine/tvgSwRasterAvx.h
index e2e8360d..3f53e877 100644
--- a/src/renderer/sw_engine/tvgSwRasterAvx.h
+++ b/src/renderer/sw_engine/tvgSwRasterAvx.h
@@ -158,47 +158,51 @@ static bool avxRasterTranslucentRect(SwSurface* surface, const RenderRegion& bbo
 }
 
 
-static bool avxRasterTranslucentRle(SwSurface* surface, const SwRle* rle, const RenderColor& c)
+static bool avxRasterTranslucentRle(SwSurface* surface, const SwRle* rle, const RenderRegion& bbox, const RenderColor& c)
 {
+    const SwSpan* end;
+    int32_t x, len;
+
     //32bit channels
     if (surface->channelSize == sizeof(uint32_t)) {
         auto color = surface->join(c.r, c.g, c.b, c.a);
         uint32_t src;
 
-        ARRAY_FOREACH(span, rle->spans) {
-            auto dst = &surface->buf32[span->y * surface->stride + span->x];
-
+        for (auto span = rle->fetch(bbox, &end); span < end; ++span) {
+            FETCH_BOUND(span, bbox);
+            span->fetch(bbox, x, len);
             if (span->coverage < 255) src = ALPHA_BLEND(color, span->coverage);
             else src = color;
 
+            auto dst = &surface->buf32[span->y * surface->stride + x];
             auto ialpha = IA(src);
 
             //1. fill the not aligned memory (for 128-bit registers a 16-bytes alignment is required)
-            auto notAligned = ((uintptr_t)dst & 0xf) / 4;
+            int32_t notAligned = ((uintptr_t)dst & 0xf) / 4;
             if (notAligned) {
-                notAligned = (N_32BITS_IN_128REG - notAligned > span->len ? span->len : N_32BITS_IN_128REG - notAligned);
-                for (uint32_t x = 0; x < notAligned; ++x, ++dst) {
+                notAligned = (N_32BITS_IN_128REG - notAligned > len ? len : N_32BITS_IN_128REG - notAligned);
+                for (auto x = 0; x < notAligned; ++x, ++dst) {
                     *dst = src + ALPHA_BLEND(*dst, ialpha);
                 }
             }
 
             //2. fill the aligned memory using avx - N_32BITS_IN_128REG pixels processed at once
             //In order to avoid unnecessary avx variables declarations a check is made whether there are any iterations at all
-            uint32_t iterations = (span->len - notAligned) / N_32BITS_IN_128REG;
-            uint32_t avxFilled = 0;
+            int32_t iterations = (len - notAligned) / N_32BITS_IN_128REG;
+            int32_t avxFilled = 0;
             if (iterations > 0) {
                 auto avxSrc = _mm_set1_epi32(src);
                 auto avxIalpha = _mm_set1_epi8(ialpha);
 
                 avxFilled = iterations * N_32BITS_IN_128REG;
                 auto avxDst = (__m128i*)dst;
-                for (uint32_t x = 0; x < iterations; ++x, ++avxDst) {
+                for (auto x = 0; x < iterations; ++x, ++avxDst) {
                     *avxDst = _mm_add_epi32(avxSrc, ALPHA_BLEND(*avxDst, avxIalpha));
                 }
             }
 
             //3. fill the remaining pixels
-            int32_t leftovers = span->len - notAligned - avxFilled;
+            auto leftovers = len - notAligned - avxFilled;
             dst += avxFilled;
             while (leftovers--) {
                 *dst = src + ALPHA_BLEND(*dst, ialpha);
@@ -211,12 +215,14 @@ static bool avxRasterTranslucentRle(SwSurface* surface, const SwRle* rle, const
     } else if (surface->channelSize == sizeof(uint8_t)) {
         TVGLOG("SW_ENGINE", "Require AVX Optimization, Channel Size = %d", surface->channelSize);
         uint8_t src;
-        ARRAY_FOREACH(span, rle->spans) {
-            auto dst = &surface->buf8[span->y * surface->stride + span->x];
+        for (auto span = rle->fetch(bbox, &end); span < end; ++span) {
+            FETCH_BOUND(span, bbox);
+            span->fetch(bbox, x, len);
+            auto dst = &surface->buf8[span->y * surface->stride + x];
             if (span->coverage < 255) src = MULTIPLY(span->coverage, c.a);
             else src = c.a;
             auto ialpha = ~c.a;
-            for (uint32_t x = 0; x < span->len; ++x, ++dst) {
+            for (auto x = 0; x < len; ++x, ++dst) {
                 *dst = src + MULTIPLY(*dst, ialpha);
             }
         }
diff --git a/src/renderer/sw_engine/tvgSwRasterC.h b/src/renderer/sw_engine/tvgSwRasterC.h
index 82b696be..8dcbf14c 100644
--- a/src/renderer/sw_engine/tvgSwRasterC.h
+++ b/src/renderer/sw_engine/tvgSwRasterC.h
@@ -92,30 +92,35 @@ static void inline cRasterPixels(PIXEL_T* dst, PIXEL_T val, uint32_t offset, int
 }
 
 
-static bool inline cRasterTranslucentRle(SwSurface* surface, const SwRle* rle, const RenderColor& c)
+static bool inline cRasterTranslucentRle(SwSurface* surface, const SwRle* rle, const RenderRegion& bbox, const RenderColor& c)
 {
+    const SwSpan* end;
+    int32_t x, len;
+
     //32bit channels
     if (surface->channelSize == sizeof(uint32_t)) {
         auto color = surface->join(c.r, c.g, c.b, c.a);
         uint32_t src;
-        ARRAY_FOREACH(span, rle->spans) {
-            auto dst = &surface->buf32[span->y * surface->stride + span->x];
+        for (auto span = rle->fetch(bbox, &end); span < end; ++span) {
+            span->fetch(bbox, x, len);
+            auto dst = &surface->buf32[span->y * surface->stride + x];
             if (span->coverage < 255) src = ALPHA_BLEND(color, span->coverage);
             else src = color;
             auto ialpha = IA(src);
-            for (uint32_t x = 0; x < span->len; ++x, ++dst) {
+            for (auto x = 0; x < len; ++x, ++dst) {
                 *dst = src + ALPHA_BLEND(*dst, ialpha);
             }
         }
     //8bit grayscale
     } else if (surface->channelSize == sizeof(uint8_t)) {
         uint8_t src;
-        ARRAY_FOREACH(span, rle->spans) {
-            auto dst = &surface->buf8[span->y * surface->stride + span->x];
+        for (auto span = rle->fetch(bbox, &end); span < end; ++span) {
+            span->fetch(bbox, x, len);
+            auto dst = &surface->buf8[span->y * surface->stride + x];
             if (span->coverage < 255) src = MULTIPLY(span->coverage, c.a);
             else src = c.a;
             auto ialpha = ~c.a;
-            for (uint32_t x = 0; x < span->len; ++x, ++dst) {
+            for (auto x = 0; x < len; ++x, ++dst) {
                 *dst = src + MULTIPLY(*dst, ialpha);
             }
         }
diff --git a/src/renderer/sw_engine/tvgSwRasterNeon.h b/src/renderer/sw_engine/tvgSwRasterNeon.h
index d5c408c6..d8409b6d 100644
--- a/src/renderer/sw_engine/tvgSwRasterNeon.h
+++ b/src/renderer/sw_engine/tvgSwRasterNeon.h
@@ -89,20 +89,25 @@ static void neonRasterPixel32(uint32_t *dst, uint32_t val, uint32_t offset, int3
 }
 
 
-static bool neonRasterTranslucentRle(SwSurface* surface, const SwRle* rle, const RenderColor& c)
+static bool neonRasterTranslucentRle(SwSurface* surface, const SwRle* rle, const RenderRegion& bbox, const RenderColor& c)
 {
+    const SwSpan* end;
+    int32_t x, len;
+
     //32bit channels
     if (surface->channelSize == sizeof(uint32_t)) {
         auto color = surface->join(c.r, c.g, c.b, c.a);
         uint32_t src;
         uint8x8_t *vDst = nullptr;
-        uint16_t align;
+        int32_t align;
 
-        ARRAY_FOREACH(span, rle->spans) {
+        for (auto span = rle->fetch(bbox, &end); span < end; ++span) {
+            FETCH_BOUND(span, bbox);
+            span->fetch(bbox, x, len);
             if (span->coverage < 255) src = ALPHA_BLEND(color, span->coverage);
             else src = color;
 
-            auto dst = &surface->buf32[span->y * surface->stride + span->x];
+            auto dst = &surface->buf32[span->y * surface->stride + x];
             auto ialpha = IA(src);
 
             if ((((uintptr_t) dst) & 0x7) != 0) {
@@ -118,11 +123,11 @@ static bool neonRasterTranslucentRle(SwSurface* surface, const SwRle* rle, const
             uint8x8_t vSrc = (uint8x8_t) vdup_n_u32(src);
             uint8x8_t vIalpha = vdup_n_u8((uint8_t) ialpha);
 
-            for (uint32_t x = 0; x < (span->len - align) / 2; ++x)
+            for (int32_t x = 0; x < (len - align) / 2; ++x)
                 vDst[x] = vadd_u8(vSrc, ALPHA_BLEND(vDst[x], vIalpha));
 
-            auto leftovers = (span->len - align) % 2;
-            if (leftovers > 0) dst[span->len - 1] = src + ALPHA_BLEND(dst[span->len - 1], ialpha);
+            auto leftovers = (len - align) % 2;
+            if (leftovers > 0) dst[len - 1] = src + ALPHA_BLEND(dst[len - 1], ialpha);
 
             ++span;
         }
@@ -130,12 +135,14 @@ static bool neonRasterTranslucentRle(SwSurface* surface, const SwRle* rle, const
     } else if (surface->channelSize == sizeof(uint8_t)) {
         TVGLOG("SW_ENGINE", "Require Neon Optimization, Channel Size = %d", surface->channelSize);
         uint8_t src;
-        ARRAY_FOREACH(span, rle->spans) {
-            auto dst = &surface->buf8[span->y * surface->stride + span->x];
+        for (auto span = rle->fetch(bbox, &end); span < end; ++span) {
+            FETCH_BOUND(span, bbox);
+            span->fetch(bbox, x, len);
+            auto dst = &surface->buf8[span->y * surface->stride + x];
             if (span->coverage < 255) src = MULTIPLY(span->coverage, c.a);
             else src = c.a;
             auto ialpha = ~c.a;
-            for (uint32_t x = 0; x < span->len; ++x, ++dst) {
+            for (auto x = 0; x < len; ++x, ++dst) {
                 *dst = src + MULTIPLY(*dst, ialpha);
             }
         }
diff --git a/src/renderer/sw_engine/tvgSwRasterTexmap.h b/src/renderer/sw_engine/tvgSwRasterTexmap.h
index 62b0bea3..4cf46424 100644
--- a/src/renderer/sw_engine/tvgSwRasterTexmap.h
+++ b/src/renderer/sw_engine/tvgSwRasterTexmap.h
@@ -52,33 +52,25 @@ static float xa, xb, ua, va;
 
 
 //Y Range exception handling
-static bool _arrange(const SwImage* image, const RenderRegion* bbox, int& yStart, int& yEnd)
+static bool _arrange(const SwImage* image, const RenderRegion& bbox, int& yStart, int& yEnd)
 {
-    int32_t bboxTop, bboxBottom;
-
-    if (bbox) {
-        bboxTop = bbox->min.y;
-        bboxBottom = bbox->max.y;
-    } else {
-        bboxTop = image->rle->spans.first().y;
-        bboxBottom = image->rle->spans.last().y;
-    }
-
-    if (yStart < bboxTop) yStart = bboxTop;
-    if (yEnd > bboxBottom) yEnd = bboxBottom;
+    auto top = image->rle ? std::max((int)image->rle->spans.first().y, bbox.min.y) : (int)bbox.min.y;
+    auto bottom = image->rle? std::min((int)image->rle->spans.last().y, bbox.max.y) : (int)bbox.max.y;
+    if (yStart < top) yStart = top;
+    if (yEnd > bottom) yEnd = bottom;
 
     return yEnd > yStart;
 }
 
 
-static bool _rasterMaskedPolygonImageSegment(SwSurface* surface, const SwImage* image, const RenderRegion* bbox, int yStart, int yEnd, AASpans* aaSpans, uint8_t opacity, uint8_t dirFlag = 0)
+static bool _rasterMaskedPolygonImageSegment(SwSurface* surface, const SwImage* image, const RenderRegion& bbox, int yStart, int yEnd, AASpans* aaSpans, uint8_t opacity, uint8_t dirFlag = 0)
 {
     TVGERR("SW_ENGINE", "TODO: _rasterMaskedPolygonImageSegment()");
     return false;
 }
 
 
-static void _rasterBlendingPolygonImageSegment(SwSurface* surface, const SwImage* image, const RenderRegion* bbox, int yStart, int yEnd, AASpans* aaSpans, uint8_t opacity)
+static void _rasterBlendingPolygonImageSegment(SwSurface* surface, const SwImage* image, const RenderRegion& bbox, int yStart, int yEnd, AASpans* aaSpans, uint8_t opacity)
 {
     float _dudx = dudx, _dvdx = dvdx;
     float _dxdya = dxdya, _dxdyb = dxdyb, _dudya = dudya, _dvdya = dvdya;
@@ -89,26 +81,15 @@ static void _rasterBlendingPolygonImageSegment(SwSurface* surface, const SwImage
     int32_t sh = static_cast<int32_t>(image->h);
     int32_t x1, x2, x, y, ar, ab, iru, irv, px, ay;
     int32_t vv = 0, uu = 0;
-    int32_t minx = INT32_MAX, maxx = 0;
+    auto minx = bbox.min.x;
+    auto maxx = bbox.max.x;
     float dx, u, v, iptr;
     uint32_t* buf;
-    SwSpan* span = nullptr;         //used only when rle based.
 
     if (!_arrange(image, bbox, yStart, yEnd)) return;
 
-    //Loop through all lines in the segment
-    uint32_t spanIdx = 0;
-
-    if (bbox) {
-        minx = bbox->min.x;
-        maxx = bbox->max.x;
-    } else {
-        span = image->rle->data();
-        while (span->y < yStart) {
-            ++span;
-            ++spanIdx;
-        }
-    }
+    const SwSpan* span = nullptr;         //used only when rle based.
+    if (image->rle) span = image->rle->fetch(yStart, yEnd, nullptr);
 
     y = yStart;
 
@@ -116,16 +97,17 @@ static void _rasterBlendingPolygonImageSegment(SwSurface* surface, const SwImage
         x1 = (int32_t)_xa;
         x2 = (int32_t)_xb;
 
-        if (!bbox) {
+        if (span) {
             minx = INT32_MAX;
             maxx = 0;
             //one single row, could be consisted of multiple spans.
-            while (span->y == y && spanIdx < image->rle->size()) {
+            while (span->y == y && span < image->rle->spans.end()) {
                 if (minx > span->x) minx = span->x;
                 if (maxx < span->x + span->len) maxx = span->x + span->len;
                 ++span;
-                ++spanIdx;
             }
+            if (minx < bbox.min.x) minx = bbox.min.x;
+            if (maxx > bbox.max.x) maxx = bbox.max.x;
         }
         if (x1 < minx) x1 = minx;
         if (x2 > maxx) x2 = maxx;
@@ -195,8 +177,7 @@ static void _rasterBlendingPolygonImageSegment(SwSurface* surface, const SwImage
         _ua += _dudya;
         _va += _dvdya;
 
-        if (!bbox && spanIdx >= image->rle->size()) break;
-
+        if (span && span >= image->rle->spans.end()) break;
         ++y;
     }
     xa = _xa;
@@ -206,7 +187,7 @@ static void _rasterBlendingPolygonImageSegment(SwSurface* surface, const SwImage
 }
 
 
-static void _rasterPolygonImageSegment(SwSurface* surface, const SwImage* image, const RenderRegion* bbox, int yStart, int yEnd, AASpans* aaSpans, uint8_t opacity, bool matting)
+static void _rasterPolygonImageSegment(SwSurface* surface, const SwImage* image, const RenderRegion& bbox, int yStart, int yEnd, AASpans* aaSpans, uint8_t opacity, bool matting)
 {
     float _dudx = dudx, _dvdx = dvdx;
     float _dxdya = dxdya, _dxdyb = dxdyb, _dudya = dudya, _dvdya = dvdya;
@@ -217,10 +198,10 @@ static void _rasterPolygonImageSegment(SwSurface* surface, const SwImage* image,
     int32_t sh = static_cast<int32_t>(image->h);
     int32_t x1, x2, x, y, ar, ab, iru, irv, px, ay;
     int32_t vv = 0, uu = 0;
-    int32_t minx = INT32_MAX, maxx = 0;
+    auto minx = bbox.min.x;
+    auto maxx = bbox.max.x;
     float dx, u, v, iptr;
     uint32_t* buf;
-    SwSpan* span = nullptr;         //used only when rle based.
 
     //for matting(composition)
     auto csize = matting ? surface->compositor->image.channelSize: 0;
@@ -229,19 +210,8 @@ static void _rasterPolygonImageSegment(SwSurface* surface, const SwImage* image,
 
     if (!_arrange(image, bbox, yStart, yEnd)) return;
 
-    //Loop through all lines in the segment
-    uint32_t spanIdx = 0;
-
-    if (bbox) {
-        minx = bbox->min.x;
-        maxx = bbox->max.x;
-    } else {
-        span = image->rle->data();
-        while (span->y < yStart) {
-            ++span;
-            ++spanIdx;
-        }
-    }
+    const SwSpan* span = nullptr;         //used only when rle based.
+    if (image->rle) span = image->rle->fetch(yStart, yEnd, nullptr);
 
     y = yStart;
 
@@ -249,16 +219,17 @@ static void _rasterPolygonImageSegment(SwSurface* surface, const SwImage* image,
         x1 = (int32_t)_xa;
         x2 = (int32_t)_xb;
 
-        if (!bbox) {
+        if (span) {
             minx = INT32_MAX;
             maxx = 0;
             //one single row, could be consisted of multiple spans.
-            while (span->y == y && spanIdx < image->rle->size()) {
+            while (span->y == y && span < image->rle->spans.end()) {
                 if (minx > span->x) minx = span->x;
                 if (maxx < span->x + span->len) maxx = span->x + span->len;
                 ++span;
-                ++spanIdx;
             }
+            if (minx < bbox.min.x) minx = bbox.min.x;
+            if (maxx > bbox.max.x) maxx = bbox.max.x;
         }
         if (x1 < minx) x1 = minx;
         if (x2 > maxx) x2 = maxx;
@@ -387,8 +358,7 @@ static void _rasterPolygonImageSegment(SwSurface* surface, const SwImage* image,
         _ua += _dudya;
         _va += _dvdya;
 
-        if (!bbox && spanIdx >= image->rle->size()) break;
-
+        if (span && span >= image->rle->spans.end()) break;
         ++y;
     }
     xa = _xa;
@@ -399,7 +369,7 @@ static void _rasterPolygonImageSegment(SwSurface* surface, const SwImage* image,
 
 
 /* This mapping algorithm is based on Mikael Kalms's. */
-static void _rasterPolygonImage(SwSurface* surface, const SwImage* image, const RenderRegion* bbox, Polygon& polygon, AASpans* aaSpans, uint8_t opacity)
+static void _rasterPolygonImage(SwSurface* surface, const SwImage* image, const RenderRegion& bbox, Polygon& polygon, AASpans* aaSpans, uint8_t opacity)
 {
     float x[3] = {polygon.vertex[0].pt.x, polygon.vertex[1].pt.x, polygon.vertex[2].pt.x};
     float y[3] = {polygon.vertex[0].pt.y, polygon.vertex[1].pt.y, polygon.vertex[2].pt.y};
@@ -460,7 +430,7 @@ static void _rasterPolygonImage(SwSurface* surface, const SwImage* image, const
     if (tvg::equal(y[0], y[1])) side = x[0] > x[1];
     if (tvg::equal(y[1], y[2])) side = x[2] > x[1];
 
-    auto bboxTop = bbox ? bbox->min.y : image->rle->data()->y;  //Normal Image or Rle Image?
+    auto bboxTop = image->rle ? std::max(bbox.min.y, (int)image->rle->data()->y) : bbox.min.y;
     auto compositing = _compositing(surface);   //Composition required
     auto blending = _blending(surface);         //Blending required
 
@@ -576,7 +546,7 @@ static void _rasterPolygonImage(SwSurface* surface, const SwImage* image, const
 }
 
 
-static AASpans* _AASpans(float ymin, float ymax, const SwImage* image, const RenderRegion* bbox)
+static AASpans* _AASpans(float ymin, float ymax, const SwImage* image, const RenderRegion& bbox)
 {
     auto yStart = static_cast<int>(ymin);
     auto yEnd = static_cast<int>(ymax);
@@ -863,7 +833,7 @@ static bool _apply(SwSurface* surface, AASpans* aaSpans)
     | /  |
     3 -- 2
 */
-static bool _rasterTexmapPolygon(SwSurface* surface, const SwImage* image, const Matrix& transform, const RenderRegion* bbox, uint8_t opacity)
+static bool _rasterTexmapPolygon(SwSurface* surface, const SwImage* image, const Matrix& transform, const RenderRegion& bbox, uint8_t opacity)
 {
     if (surface->channelSize == sizeof(uint8_t)) {
         TVGERR("SW_ENGINE", "Not supported grayscale Textmap polygon!");
@@ -871,7 +841,7 @@ static bool _rasterTexmapPolygon(SwSurface* surface, const SwImage* image, const
     }
 
     //Exceptions: No dedicated drawing area?
-    if ((!image->rle && !bbox) || (image->rle && image->rle->size() == 0)) return true;
+    if ((!image->rle && bbox.invalid()) || (image->rle && image->rle->size() == 0)) return true;
 
    /* Prepare vertices.
       shift XY coordinates to match the sub-pixeling technique. */
diff --git a/src/renderer/sw_engine/tvgSwRenderer.cpp b/src/renderer/sw_engine/tvgSwRenderer.cpp
index c44f28cb..08ad4ee5 100644
--- a/src/renderer/sw_engine/tvgSwRenderer.cpp
+++ b/src/renderer/sw_engine/tvgSwRenderer.cpp
@@ -204,9 +204,7 @@ struct SwImageTask : SwTask
         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, transform, clipBox, bbox, mpool, tid)) goto end;
-
+            if (!imagePrepare(&image, transform, clipBox,  bbox, mpool, tid)) goto end;
             if (clips.count > 0) {
                 if (!imageGenRle(&image, bbox, false)) goto end;
                 if (image.rle) {
@@ -222,6 +220,7 @@ struct SwImageTask : SwTask
         }
         goto end;
     err:
+        bbox.reset();
         rleReset(image.rle);
     end:
         imageDelOutline(&image, mpool, tid);
@@ -234,31 +233,6 @@ struct SwImageTask : SwTask
 };
 
 
-static void _renderFill(SwShapeTask* task, SwSurface* surface)
-{
-    if (auto fill = task->rshape->fill) {
-        rasterGradientShape(surface, &task->shape, fill, task->opacity);
-    } else {
-        RenderColor c;
-        task->rshape->fillColor(&c.r, &c.g, &c.b, &c.a);
-        c.a = MULTIPLY(task->opacity, c.a);
-        if (c.a > 0) rasterShape(surface, &task->shape, c);
-    }
-}
-
-static void _renderStroke(SwShapeTask* task, SwSurface* surface)
-{
-    if (auto strokeFill = task->rshape->strokeFill()) {
-        rasterGradientStroke(surface, &task->shape, strokeFill, task->opacity);
-    } else {
-        RenderColor c;
-        if (task->rshape->strokeFill(&c.r, &c.g, &c.b, &c.a)) {
-            c.a = MULTIPLY(task->opacity, c.a);
-            if (c.a > 0) rasterStroke(surface, &task->shape, c);
-        }
-    }
-}
-
 /************************************************************************/
 /* External Class Implementation                                        */
 /************************************************************************/
@@ -299,10 +273,10 @@ bool SwRenderer::clear()
 
 bool SwRenderer::sync()
 {
+    //clear if the rendering was not triggered.
     ARRAY_FOREACH(p, tasks) {
-        if ((*p)->disposed) {
-            delete(*p);
-        } else {
+        if ((*p)->disposed) delete(*p);
+        else {
             (*p)->done();
             (*p)->pushed = false;
         }
@@ -400,6 +374,7 @@ bool SwRenderer::renderImage(RenderData data)
 
     if (task->opacity == 0) return true;
 
+    //full scene or partial rendering
     return rasterImage(surface, &task->image, task->transform, task->bbox, task->opacity);
 }
 
@@ -413,13 +388,35 @@ bool SwRenderer::renderShape(RenderData data)
 
     if (task->opacity == 0) return true;
 
-    //Main raster stage
+    auto fill = [](SwShapeTask* task, SwSurface* surface, const RenderRegion& bbox) {
+        if (auto fill = task->rshape->fill) {
+            rasterGradientShape(surface, &task->shape, bbox, fill, task->opacity);
+        } else {
+            RenderColor c;
+            task->rshape->fillColor(&c.r, &c.g, &c.b, &c.a);
+            c.a = MULTIPLY(task->opacity, c.a);
+            if (c.a > 0) rasterShape(surface, &task->shape, bbox, c);
+        }
+    };
+
+    auto stroke = [](SwShapeTask* task, SwSurface* surface, const RenderRegion& bbox) {
+        if (auto strokeFill = task->rshape->strokeFill()) {
+            rasterGradientStroke(surface, &task->shape, bbox, strokeFill, task->opacity);
+        } else {
+            RenderColor c;
+            if (task->rshape->strokeFill(&c.r, &c.g, &c.b, &c.a)) {
+                c.a = MULTIPLY(task->opacity, c.a);
+                if (c.a > 0) rasterStroke(surface, &task->shape, bbox, c);
+            }
+        }
+    };
+
     if (task->rshape->strokeFirst()) {
-        _renderStroke(task, surface);
-        _renderFill(task, surface);
+        stroke(task, surface, task->bbox);
+        fill(task, surface, task->shape.bbox);
     } else {
-        _renderFill(task, surface);
-        _renderStroke(task, surface);
+        fill(task, surface, task->shape.bbox);
+        stroke(task, surface, task->bbox);
     }
 
     return true;
diff --git a/src/renderer/sw_engine/tvgSwRle.cpp b/src/renderer/sw_engine/tvgSwRle.cpp
index 58ebffa2..0b57be33 100644
--- a/src/renderer/sw_engine/tvgSwRle.cpp
+++ b/src/renderer/sw_engine/tvgSwRle.cpp
@@ -881,10 +881,10 @@ bool rleClip(SwRle *rle, const SwRle *clip)
     Array<SwSpan> out;
     out.reserve(std::max(rle->spans.count, clip->spans.count));
 
-    auto spans = rle->data();
-    auto end = rle->spans.end();
-    auto cspans = clip->data();
-    auto cend = clip->spans.end();
+    const SwSpan *end;
+    auto spans = rle->fetch(clip->spans.first().y, clip->spans.last().y, &end);
+    const SwSpan *cend;
+    auto cspans = clip->fetch(rle->spans.first().y, rle->spans.last().y, &cend);
 
     while(spans < end && cspans < cend) {
         //align y-coordinates.
@@ -928,9 +928,10 @@ bool rleClip(SwRle *rle, const RenderRegion* clip)
     Array<SwSpan> out;
     out.reserve(rle->spans.count);
     auto data = out.data;
+    const SwSpan* end;
     uint16_t x, len;
 
-    ARRAY_FOREACH(p, rle->spans) {
+    for (auto p = rle->fetch(*clip, &end); p < end; ++p) {
         if (p->y >= max.y) break;
         if (p->y < min.y || p->x >= max.x || (p->x + p->len) <= min.x) continue;
         if (p->x < min.x) {