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- /*
- * Copyright 2018 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- in uniform sampler2D src;
- layout(ctype=SkIRect) in int4 bounds;
- uniform float4 boundsUniform;
- layout(ctype=SkRect) in float4 srcRect;
- in uniform float xInvZoom;
- in uniform float yInvZoom;
- in uniform float xInvInset;
- in uniform float yInvInset;
- uniform half2 offset;
- @coordTransform(src) {
- SkMatrix::I()
- }
- void main() {
- float2 coord = sk_TransformedCoords2D[0];
- float2 zoom_coord = offset + coord * float2(xInvZoom, yInvZoom);
- float2 delta = (coord - boundsUniform.xy) * boundsUniform.zw;
- delta = min(delta, half2(1.0, 1.0) - delta);
- delta *= float2(xInvInset, yInvInset);
- float weight = 0.0;
- if (delta.s < 2.0 && delta.t < 2.0) {
- delta = half2(2.0, 2.0) - delta;
- float dist = length(delta);
- dist = max(2.0 - dist, 0.0);
- weight = min(dist * dist, 1.0);
- } else {
- float2 delta_squared = delta * delta;
- weight = min(min(delta_squared.x, delta_squared.y), 1.0);
- }
- sk_OutColor = texture(src, mix(coord, zoom_coord, weight));
- }
- @setData(pdman) {
- SkScalar invW = 1.0f / src.width();
- SkScalar invH = 1.0f / src.height();
- {
- SkScalar y = srcRect.y() * invH;
- if (srcProxy.origin() != kTopLeft_GrSurfaceOrigin) {
- y = 1.0f - (srcRect.height() / bounds.height()) - y;
- }
- pdman.set2f(offset, srcRect.x() * invW, y);
- }
- {
- SkScalar y = bounds.y() * invH;
- if (srcProxy.origin() != kTopLeft_GrSurfaceOrigin) {
- y = 1.0f - bounds.height() * invH;
- }
- pdman.set4f(boundsUniform,
- bounds.x() * invW,
- y,
- SkIntToScalar(src.width()) / bounds.width(),
- SkIntToScalar(src.height()) / bounds.height());
- }
- }
- @test(d) {
- sk_sp<GrTextureProxy> proxy = d->textureProxy(0);
- const int kMaxWidth = 200;
- const int kMaxHeight = 200;
- const SkScalar kMaxInset = 20.0f;
- uint32_t width = d->fRandom->nextULessThan(kMaxWidth);
- uint32_t height = d->fRandom->nextULessThan(kMaxHeight);
- SkScalar inset = d->fRandom->nextRangeScalar(1.0f, kMaxInset);
- SkIRect bounds = SkIRect::MakeWH(SkIntToScalar(kMaxWidth), SkIntToScalar(kMaxHeight));
- SkRect srcRect = SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height));
- auto effect = GrMagnifierEffect::Make(std::move(proxy),
- bounds,
- srcRect,
- srcRect.width() / bounds.width(),
- srcRect.height() / bounds.height(),
- bounds.width() / inset,
- bounds.height() / inset);
- SkASSERT(effect);
- return effect;
- }
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