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/*
* 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 "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkMatrix.h"
#include "SkRect.h"
#include "SkUnPreMultiply.h"
#if SK_SUPPORT_GPU
#include "effects/GrBicubicEffect.h"
#include "GrContext.h"
#include "GrTexture.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(SkReadBuffer& buffer)
: INHERITED(1, buffer) {
SkDEBUGCODE(bool success =) buffer.readScalarArray(fCoefficients, 16);
SkASSERT(success);
fScale.fWidth = buffer.readScalar();
fScale.fHeight = buffer.readScalar();
buffer.validate(SkScalarIsFinite(fScale.fWidth) &&
SkScalarIsFinite(fScale.fHeight) &&
(fScale.fWidth >= 0) &&
(fScale.fHeight >= 0));
}
void SkBicubicImageFilter::flatten(SkWriteBuffer& 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 Context& ctx,
SkBitmap* result,
SkIPoint* offset) const {
SkBitmap src = source;
SkIPoint srcOffset = SkIPoint::Make(0, 0);
if (getInput(0) && !getInput(0)->filterImage(proxy, source, ctx, &src, &srcOffset)) {
return false;
}
if (src.colorType() != kN32_SkColorType) {
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());
if (!result->allocPixels()) {
return false;
}
SkRect srcRect;
src.getBounds(&srcRect);
srcRect.offset(SkPoint::Make(SkIntToScalar(srcOffset.fX), SkIntToScalar(srcOffset.fY)));
SkMatrix inverse;
inverse.setRectToRect(dstRect, srcRect, SkMatrix::kFill_ScaleToFit);
inverse.postTranslate(-0.5f, -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);
}
}
offset->fX = dstIRect.fLeft;
offset->fY = dstIRect.fTop;
return true;
}
///////////////////////////////////////////////////////////////////////////////
#if SK_SUPPORT_GPU
bool SkBicubicImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, const Context& ctx,
SkBitmap* result, SkIPoint* offset) const {
SkBitmap srcBM = src;
if (getInput(0) && !getInput(0)->getInputResultGPU(proxy, src, ctx, &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);
WrapTexture(dst, desc.fWidth, desc.fHeight, result);
return true;
}
#endif
///////////////////////////////////////////////////////////////////////////////
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