| /* |
| * Copyright 2013 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkBicubicImageFilter.h" |
| #include "SkBitmap.h" |
| #include "SkColorPriv.h" |
| #include "SkFlattenableBuffers.h" |
| #include "SkMatrix.h" |
| #include "SkRect.h" |
| #include "SkUnPreMultiply.h" |
| |
| #if SK_SUPPORT_GPU |
| #include "effects/GrBicubicEffect.h" |
| #include "GrContext.h" |
| #include "GrTexture.h" |
| #include "SkImageFilterUtils.h" |
| #endif |
| |
| #define DS(x) SkDoubleToScalar(x) |
| |
| static const SkScalar gMitchellCoefficients[16] = { |
| DS( 1.0 / 18.0), DS(-9.0 / 18.0), DS( 15.0 / 18.0), DS( -7.0 / 18.0), |
| DS(16.0 / 18.0), DS( 0.0 / 18.0), DS(-36.0 / 18.0), DS( 21.0 / 18.0), |
| DS( 1.0 / 18.0), DS( 9.0 / 18.0), DS( 27.0 / 18.0), DS(-21.0 / 18.0), |
| DS( 0.0 / 18.0), DS( 0.0 / 18.0), DS( -6.0 / 18.0), DS( 7.0 / 18.0), |
| }; |
| |
| SkBicubicImageFilter::SkBicubicImageFilter(const SkSize& scale, const SkScalar coefficients[16], SkImageFilter* input) |
| : INHERITED(input), |
| fScale(scale) { |
| memcpy(fCoefficients, coefficients, sizeof(fCoefficients)); |
| } |
| |
| SkBicubicImageFilter* SkBicubicImageFilter::CreateMitchell(const SkSize& scale, |
| SkImageFilter* input) { |
| return SkNEW_ARGS(SkBicubicImageFilter, (scale, gMitchellCoefficients, input)); |
| } |
| |
| SkBicubicImageFilter::SkBicubicImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) { |
| SkDEBUGCODE(uint32_t readSize =) buffer.readScalarArray(fCoefficients); |
| SkASSERT(readSize == 16); |
| fScale.fWidth = buffer.readScalar(); |
| fScale.fHeight = buffer.readScalar(); |
| } |
| |
| void SkBicubicImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.writeScalarArray(fCoefficients, 16); |
| buffer.writeScalar(fScale.fWidth); |
| buffer.writeScalar(fScale.fHeight); |
| } |
| |
| SkBicubicImageFilter::~SkBicubicImageFilter() { |
| } |
| |
| inline SkPMColor cubicBlend(const SkScalar c[16], SkScalar t, SkPMColor c0, SkPMColor c1, SkPMColor c2, SkPMColor c3) { |
| SkScalar t2 = t * t, t3 = t2 * t; |
| SkScalar cc[4]; |
| // FIXME: For the fractx case, this should be refactored out of this function. |
| cc[0] = c[0] + SkScalarMul(c[1], t) + SkScalarMul(c[2], t2) + SkScalarMul(c[3], t3); |
| cc[1] = c[4] + SkScalarMul(c[5], t) + SkScalarMul(c[6], t2) + SkScalarMul(c[7], t3); |
| cc[2] = c[8] + SkScalarMul(c[9], t) + SkScalarMul(c[10], t2) + SkScalarMul(c[11], t3); |
| cc[3] = c[12] + SkScalarMul(c[13], t) + SkScalarMul(c[14], t2) + SkScalarMul(c[15], t3); |
| SkScalar a = SkScalarClampMax(SkScalarMul(cc[0], SkGetPackedA32(c0)) + SkScalarMul(cc[1], SkGetPackedA32(c1)) + SkScalarMul(cc[2], SkGetPackedA32(c2)) + SkScalarMul(cc[3], SkGetPackedA32(c3)), 255); |
| SkScalar r = SkScalarMul(cc[0], SkGetPackedR32(c0)) + SkScalarMul(cc[1], SkGetPackedR32(c1)) + SkScalarMul(cc[2], SkGetPackedR32(c2)) + SkScalarMul(cc[3], SkGetPackedR32(c3)); |
| SkScalar g = SkScalarMul(cc[0], SkGetPackedG32(c0)) + SkScalarMul(cc[1], SkGetPackedG32(c1)) + SkScalarMul(cc[2], SkGetPackedG32(c2)) + SkScalarMul(cc[3], SkGetPackedG32(c3)); |
| SkScalar b = SkScalarMul(cc[0], SkGetPackedB32(c0)) + SkScalarMul(cc[1], SkGetPackedB32(c1)) + SkScalarMul(cc[2], SkGetPackedB32(c2)) + SkScalarMul(cc[3], SkGetPackedB32(c3)); |
| return SkPackARGB32(SkScalarRoundToInt(a), |
| SkScalarRoundToInt(SkScalarClampMax(r, a)), |
| SkScalarRoundToInt(SkScalarClampMax(g, a)), |
| SkScalarRoundToInt(SkScalarClampMax(b, a))); |
| } |
| |
| bool SkBicubicImageFilter::onFilterImage(Proxy* proxy, |
| const SkBitmap& source, |
| const SkMatrix& matrix, |
| SkBitmap* result, |
| SkIPoint* loc) { |
| SkBitmap src = source; |
| if (getInput(0) && !getInput(0)->filterImage(proxy, source, matrix, &src, loc)) { |
| return false; |
| } |
| |
| if (src.config() != SkBitmap::kARGB_8888_Config) { |
| return false; |
| } |
| |
| SkAutoLockPixels alp(src); |
| if (!src.getPixels()) { |
| return false; |
| } |
| |
| SkRect dstRect = SkRect::MakeWH(SkScalarMul(SkIntToScalar(src.width()), fScale.fWidth), |
| SkScalarMul(SkIntToScalar(src.height()), fScale.fHeight)); |
| SkIRect dstIRect; |
| dstRect.roundOut(&dstIRect); |
| if (dstIRect.isEmpty()) { |
| return false; |
| } |
| result->setConfig(src.config(), dstIRect.width(), dstIRect.height()); |
| result->allocPixels(); |
| if (!result->getPixels()) { |
| return false; |
| } |
| |
| SkRect srcRect; |
| src.getBounds(&srcRect); |
| SkMatrix inverse; |
| inverse.setRectToRect(dstRect, srcRect, SkMatrix::kFill_ScaleToFit); |
| inverse.postTranslate(SkFloatToScalar(-0.5f), SkFloatToScalar(-0.5f)); |
| |
| for (int y = dstIRect.fTop; y < dstIRect.fBottom; ++y) { |
| SkPMColor* dptr = result->getAddr32(dstIRect.fLeft, y); |
| for (int x = dstIRect.fLeft; x < dstIRect.fRight; ++x) { |
| SkPoint srcPt, dstPt = SkPoint::Make(SkIntToScalar(x), SkIntToScalar(y)); |
| inverse.mapPoints(&srcPt, &dstPt, 1); |
| SkScalar fractx = srcPt.fX - SkScalarFloorToScalar(srcPt.fX); |
| SkScalar fracty = srcPt.fY - SkScalarFloorToScalar(srcPt.fY); |
| int sx = SkScalarFloorToInt(srcPt.fX); |
| int sy = SkScalarFloorToInt(srcPt.fY); |
| int x0 = SkClampMax(sx - 1, src.width() - 1); |
| int x1 = SkClampMax(sx , src.width() - 1); |
| int x2 = SkClampMax(sx + 1, src.width() - 1); |
| int x3 = SkClampMax(sx + 2, src.width() - 1); |
| int y0 = SkClampMax(sy - 1, src.height() - 1); |
| int y1 = SkClampMax(sy , src.height() - 1); |
| int y2 = SkClampMax(sy + 1, src.height() - 1); |
| int y3 = SkClampMax(sy + 2, src.height() - 1); |
| SkPMColor s00 = *src.getAddr32(x0, y0); |
| SkPMColor s10 = *src.getAddr32(x1, y0); |
| SkPMColor s20 = *src.getAddr32(x2, y0); |
| SkPMColor s30 = *src.getAddr32(x3, y0); |
| SkPMColor s0 = cubicBlend(fCoefficients, fractx, s00, s10, s20, s30); |
| SkPMColor s01 = *src.getAddr32(x0, y1); |
| SkPMColor s11 = *src.getAddr32(x1, y1); |
| SkPMColor s21 = *src.getAddr32(x2, y1); |
| SkPMColor s31 = *src.getAddr32(x3, y1); |
| SkPMColor s1 = cubicBlend(fCoefficients, fractx, s01, s11, s21, s31); |
| SkPMColor s02 = *src.getAddr32(x0, y2); |
| SkPMColor s12 = *src.getAddr32(x1, y2); |
| SkPMColor s22 = *src.getAddr32(x2, y2); |
| SkPMColor s32 = *src.getAddr32(x3, y2); |
| SkPMColor s2 = cubicBlend(fCoefficients, fractx, s02, s12, s22, s32); |
| SkPMColor s03 = *src.getAddr32(x0, y3); |
| SkPMColor s13 = *src.getAddr32(x1, y3); |
| SkPMColor s23 = *src.getAddr32(x2, y3); |
| SkPMColor s33 = *src.getAddr32(x3, y3); |
| SkPMColor s3 = cubicBlend(fCoefficients, fractx, s03, s13, s23, s33); |
| *dptr++ = cubicBlend(fCoefficients, fracty, s0, s1, s2, s3); |
| } |
| } |
| return true; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #if SK_SUPPORT_GPU |
| |
| bool SkBicubicImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, const SkMatrix& ctm, |
| SkBitmap* result, SkIPoint* offset) { |
| SkBitmap srcBM; |
| if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, ctm, &srcBM, offset)) { |
| return false; |
| } |
| GrTexture* srcTexture = srcBM.getTexture(); |
| GrContext* context = srcTexture->getContext(); |
| |
| SkRect dstRect = SkRect::MakeWH(srcBM.width() * fScale.fWidth, |
| srcBM.height() * fScale.fHeight); |
| |
| GrTextureDesc desc; |
| desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit; |
| desc.fWidth = SkScalarCeilToInt(dstRect.width()); |
| desc.fHeight = SkScalarCeilToInt(dstRect.height()); |
| desc.fConfig = kSkia8888_GrPixelConfig; |
| |
| GrAutoScratchTexture ast(context, desc); |
| SkAutoTUnref<GrTexture> dst(ast.detach()); |
| if (!dst) { |
| return false; |
| } |
| GrContext::AutoRenderTarget art(context, dst->asRenderTarget()); |
| GrPaint paint; |
| paint.addColorEffect(GrBicubicEffect::Create(srcTexture, fCoefficients))->unref(); |
| SkRect srcRect; |
| srcBM.getBounds(&srcRect); |
| context->drawRectToRect(paint, dstRect, srcRect); |
| return SkImageFilterUtils::WrapTexture(dst, desc.fWidth, desc.fHeight, result); |
| } |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |