move imagefilters into separate dir and flag for build.gn

Requires https://chromium-review.googlesource.com/c/chromium/src/+/1105062

Bug: skia:
Change-Id: I948056234efa57c0f727a61d5fb3258034de5199
Reviewed-on: https://skia-review.googlesource.com/135566
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Reed <reed@google.com>

1 files changed, 202 insertions, 0 deletions

diff --git a/src/effects/imagefilters/SkMagnifierImageFilter.cpp b/src/effects/imagefilters/SkMagnifierImageFilter.cpp
new file mode 100644
index 0000000000..40624ab05a
--- /dev/null
+++ b/src/effects/imagefilters/SkMagnifierImageFilter.cpp
@@ -0,0 +1,202 @@
+/*
+ * Copyright 2012 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 "SkMagnifierImageFilter.h"
+
+#include "SkBitmap.h"
+#include "SkColorData.h"
+#include "SkColorSpaceXformer.h"
+#include "SkFlattenablePriv.h"
+#include "SkImageFilterPriv.h"
+#include "SkReadBuffer.h"
+#include "SkSpecialImage.h"
+#include "SkWriteBuffer.h"
+#include "SkValidationUtils.h"
+
+////////////////////////////////////////////////////////////////////////////////
+#if SK_SUPPORT_GPU
+#include "../private/GrGLSL.h"
+#include "GrColorSpaceXform.h"
+#include "GrContext.h"
+#include "GrCoordTransform.h"
+#include "GrTexture.h"
+#include "effects/GrMagnifierEffect.h"
+#include "glsl/GrGLSLFragmentProcessor.h"
+#include "glsl/GrGLSLFragmentShaderBuilder.h"
+#include "glsl/GrGLSLProgramDataManager.h"
+#include "glsl/GrGLSLUniformHandler.h"
+#endif
+
+sk_sp<SkImageFilter> SkMagnifierImageFilter::Make(const SkRect& srcRect, SkScalar inset,
+                                                  sk_sp<SkImageFilter> input,
+                                                  const CropRect* cropRect) {
+    if (!SkScalarIsFinite(inset) || !SkIsValidRect(srcRect)) {
+        return nullptr;
+    }
+    if (inset < 0) {
+        return nullptr;
+    }
+    // Negative numbers in src rect are not supported
+    if (srcRect.fLeft < 0 || srcRect.fTop < 0) {
+        return nullptr;
+    }
+    return sk_sp<SkImageFilter>(new SkMagnifierImageFilter(srcRect, inset,
+                                                           std::move(input),
+                                                           cropRect));
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+SkMagnifierImageFilter::SkMagnifierImageFilter(const SkRect& srcRect,
+                                               SkScalar inset,
+                                               sk_sp<SkImageFilter> input,
+                                               const CropRect* cropRect)
+    : INHERITED(&input, 1, cropRect)
+    , fSrcRect(srcRect)
+    , fInset(inset) {
+    SkASSERT(srcRect.left() >= 0 && srcRect.top() >= 0 && inset >= 0);
+}
+
+sk_sp<SkFlattenable> SkMagnifierImageFilter::CreateProc(SkReadBuffer& buffer) {
+    SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
+    SkRect src;
+    buffer.readRect(&src);
+    return Make(src, buffer.readScalar(), common.getInput(0), &common.cropRect());
+}
+
+void SkMagnifierImageFilter::flatten(SkWriteBuffer& buffer) const {
+    this->INHERITED::flatten(buffer);
+    buffer.writeRect(fSrcRect);
+    buffer.writeScalar(fInset);
+}
+
+sk_sp<SkSpecialImage> SkMagnifierImageFilter::onFilterImage(SkSpecialImage* source,
+                                                            const Context& ctx,
+                                                            SkIPoint* offset) const {
+    SkIPoint inputOffset = SkIPoint::Make(0, 0);
+    sk_sp<SkSpecialImage> input(this->filterInput(0, source, ctx, &inputOffset));
+    if (!input) {
+        return nullptr;
+    }
+
+    const SkIRect inputBounds = SkIRect::MakeXYWH(inputOffset.x(), inputOffset.y(),
+                                                  input->width(), input->height());
+
+    SkIRect bounds;
+    if (!this->applyCropRect(ctx, inputBounds, &bounds)) {
+        return nullptr;
+    }
+
+    SkScalar invInset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1;
+
+    SkScalar invXZoom = fSrcRect.width() / bounds.width();
+    SkScalar invYZoom = fSrcRect.height() / bounds.height();
+
+
+#if SK_SUPPORT_GPU
+    if (source->isTextureBacked()) {
+        GrContext* context = source->getContext();
+
+        sk_sp<GrTextureProxy> inputProxy(input->asTextureProxyRef(context));
+        SkASSERT(inputProxy);
+
+        offset->fX = bounds.left();
+        offset->fY = bounds.top();
+        bounds.offset(-inputOffset);
+
+        auto fp = GrMagnifierEffect::Make(std::move(inputProxy),
+                                          bounds,
+                                          fSrcRect,
+                                          invXZoom,
+                                          invYZoom,
+                                          bounds.width() * invInset,
+                                          bounds.height() * invInset);
+        fp = GrColorSpaceXformEffect::Make(std::move(fp), input->getColorSpace(),
+                                           ctx.outputProperties().colorSpace());
+        if (!fp) {
+            return nullptr;
+        }
+
+        return DrawWithFP(context, std::move(fp), bounds, ctx.outputProperties());
+    }
+#endif
+
+    SkBitmap inputBM;
+
+    if (!input->getROPixels(&inputBM)) {
+        return nullptr;
+    }
+
+    if ((inputBM.colorType() != kN32_SkColorType) ||
+        (fSrcRect.width() >= inputBM.width()) || (fSrcRect.height() >= inputBM.height())) {
+        return nullptr;
+    }
+
+    SkASSERT(inputBM.getPixels());
+    if (!inputBM.getPixels() || inputBM.width() <= 0 || inputBM.height() <= 0) {
+        return nullptr;
+    }
+
+    const SkImageInfo info = SkImageInfo::MakeN32Premul(bounds.width(), bounds.height());
+
+    SkBitmap dst;
+    if (!dst.tryAllocPixels(info)) {
+        return nullptr;
+    }
+
+    SkColor* dptr = dst.getAddr32(0, 0);
+    int dstWidth = dst.width(), dstHeight = dst.height();
+    for (int y = 0; y < dstHeight; ++y) {
+        for (int x = 0; x < dstWidth; ++x) {
+            SkScalar x_dist = SkMin32(x, dstWidth - x - 1) * invInset;
+            SkScalar y_dist = SkMin32(y, dstHeight - y - 1) * invInset;
+            SkScalar weight = 0;
+
+            static const SkScalar kScalar2 = SkScalar(2);
+
+            // To create a smooth curve at the corners, we need to work on
+            // a square twice the size of the inset.
+            if (x_dist < kScalar2 && y_dist < kScalar2) {
+                x_dist = kScalar2 - x_dist;
+                y_dist = kScalar2 - y_dist;
+
+                SkScalar dist = SkScalarSqrt(SkScalarSquare(x_dist) +
+                                             SkScalarSquare(y_dist));
+                dist = SkMaxScalar(kScalar2 - dist, 0);
+                weight = SkMinScalar(SkScalarSquare(dist), SK_Scalar1);
+            } else {
+                SkScalar sqDist = SkMinScalar(SkScalarSquare(x_dist),
+                                              SkScalarSquare(y_dist));
+                weight = SkMinScalar(sqDist, SK_Scalar1);
+            }
+
+            SkScalar x_interp = weight * (fSrcRect.x() + x * invXZoom) + (1 - weight) * x;
+            SkScalar y_interp = weight * (fSrcRect.y() + y * invYZoom) + (1 - weight) * y;
+
+            int x_val = SkTPin(bounds.x() + SkScalarFloorToInt(x_interp), 0, inputBM.width() - 1);
+            int y_val = SkTPin(bounds.y() + SkScalarFloorToInt(y_interp), 0, inputBM.height() - 1);
+
+            *dptr = *inputBM.getAddr32(x_val, y_val);
+            dptr++;
+        }
+    }
+
+    offset->fX = bounds.left();
+    offset->fY = bounds.top();
+    return SkSpecialImage::MakeFromRaster(SkIRect::MakeWH(bounds.width(), bounds.height()),
+                                          dst);
+}
+
+sk_sp<SkImageFilter> SkMagnifierImageFilter::onMakeColorSpace(SkColorSpaceXformer* xformer) const {
+    SkASSERT(1 == this->countInputs());
+    auto input = xformer->apply(this->getInput(0));
+    if (input.get() != this->getInput(0)) {
+        return SkMagnifierImageFilter::Make(fSrcRect, fInset, std::move(input),
+                                            this->getCropRectIfSet());
+    }
+    return this->refMe();
+}