aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/gpu/SkGpuDevice_drawTexture.cpp
blob: 46a3699bb0f8a58b943ed8d10c3d6b53960d04e6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
/*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "SkGpuDevice.h"

#include "GrBlurUtils.h"
#include "GrCaps.h"
#include "GrDrawContext.h"
#include "GrStyle.h"
#include "GrTextureParamsAdjuster.h"
#include "SkDraw.h"
#include "SkGrPriv.h"
#include "SkMaskFilter.h"
#include "effects/GrBicubicEffect.h"
#include "effects/GrSimpleTextureEffect.h"
#include "effects/GrTextureDomain.h"

static inline bool use_shader(bool textureIsAlphaOnly, const SkPaint& paint) {
    return textureIsAlphaOnly && paint.getShader();
}

//////////////////////////////////////////////////////////////////////////////
//  Helper functions for dropping src rect constraint in bilerp mode.

static const SkScalar kColorBleedTolerance = 0.001f;

static bool has_aligned_samples(const SkRect& srcRect, const SkRect& transformedRect) {
    // detect pixel disalignment
    if (SkScalarAbs(SkScalarRoundToScalar(transformedRect.left()) - transformedRect.left()) < kColorBleedTolerance &&
        SkScalarAbs(SkScalarRoundToScalar(transformedRect.top())  - transformedRect.top())  < kColorBleedTolerance &&
        SkScalarAbs(transformedRect.width()  - srcRect.width())  < kColorBleedTolerance &&
        SkScalarAbs(transformedRect.height() - srcRect.height()) < kColorBleedTolerance) {
        return true;
    }
    return false;
}

static bool may_color_bleed(const SkRect& srcRect,
                            const SkRect& transformedRect,
                            const SkMatrix& m,
                            bool isMSAA) {
    // Only gets called if has_aligned_samples returned false.
    // So we can assume that sampling is axis aligned but not texel aligned.
    SkASSERT(!has_aligned_samples(srcRect, transformedRect));
    SkRect innerSrcRect(srcRect), innerTransformedRect, outerTransformedRect(transformedRect);
    if (isMSAA) {
        innerSrcRect.inset(SK_Scalar1, SK_Scalar1);
    } else {
        innerSrcRect.inset(SK_ScalarHalf, SK_ScalarHalf);
    }
    m.mapRect(&innerTransformedRect, innerSrcRect);

    // The gap between outerTransformedRect and innerTransformedRect
    // represents the projection of the source border area, which is
    // problematic for color bleeding.  We must check whether any
    // destination pixels sample the border area.
    outerTransformedRect.inset(kColorBleedTolerance, kColorBleedTolerance);
    innerTransformedRect.outset(kColorBleedTolerance, kColorBleedTolerance);
    SkIRect outer, inner;
    outerTransformedRect.round(&outer);
    innerTransformedRect.round(&inner);
    // If the inner and outer rects round to the same result, it means the
    // border does not overlap any pixel centers. Yay!
    return inner != outer;
}

static bool can_ignore_bilerp_constraint(const GrTextureProducer& producer,
                                         const SkRect& srcRect,
                                         const SkMatrix& srcRectToDeviceSpace,
                                         bool isMSAA) {
    if (srcRectToDeviceSpace.rectStaysRect()) {
        // sampling is axis-aligned
        SkRect transformedRect;
        srcRectToDeviceSpace.mapRect(&transformedRect, srcRect);

        if (has_aligned_samples(srcRect, transformedRect) ||
            !may_color_bleed(srcRect, transformedRect, srcRectToDeviceSpace, isMSAA)) {
            return true;
        }
    }
    return false;
}

//////////////////////////////////////////////////////////////////////////////

void SkGpuDevice::drawTextureProducer(GrTextureProducer* producer,
                                      const SkRect* srcRect,
                                      const SkRect* dstRect,
                                      SkCanvas::SrcRectConstraint constraint,
                                      const SkMatrix& viewMatrix,
                                      const GrClip& clip,
                                      const SkPaint& paint) {
    // This is the funnel for all non-tiled bitmap/image draw calls. Log a histogram entry.
    SK_HISTOGRAM_BOOLEAN("DrawTiled", false);

    // Figure out the actual dst and src rect by clipping the src rect to the bounds of the
    // adjuster. If the src rect is clipped then the dst rect must be recomputed. Also determine
    // the matrix that maps the src rect to the dst rect.
    SkRect clippedSrcRect;
    SkRect clippedDstRect;
    const SkRect srcBounds = SkRect::MakeIWH(producer->width(), producer->height());
    SkMatrix srcToDstMatrix;
    if (srcRect) {
        if (!dstRect) {
            dstRect = &srcBounds;
        }
        if (!srcBounds.contains(*srcRect)) {
            clippedSrcRect = *srcRect;
            if (!clippedSrcRect.intersect(srcBounds)) {
                return;
            }
            if (!srcToDstMatrix.setRectToRect(*srcRect, *dstRect, SkMatrix::kFill_ScaleToFit)) {
                return;
            }
            srcToDstMatrix.mapRect(&clippedDstRect, clippedSrcRect);
        } else {
            clippedSrcRect = *srcRect;
            clippedDstRect = *dstRect;
            if (!srcToDstMatrix.setRectToRect(*srcRect, *dstRect, SkMatrix::kFill_ScaleToFit)) {
                return;
            }
        }
    } else {
        clippedSrcRect = srcBounds;
        if (dstRect) {
            clippedDstRect = *dstRect;
            if (!srcToDstMatrix.setRectToRect(srcBounds, *dstRect, SkMatrix::kFill_ScaleToFit)) {
                return;
            }
        } else {
            clippedDstRect = srcBounds;
            srcToDstMatrix.reset();
        }
    }

    // Now that we have both the view and srcToDst matrices, log our scale factor.
    LogDrawScaleFactor(SkMatrix::Concat(viewMatrix, srcToDstMatrix), paint.getFilterQuality());

    this->drawTextureProducerImpl(producer, clippedSrcRect, clippedDstRect, constraint, viewMatrix,
                                  srcToDstMatrix, clip, paint);
}

void SkGpuDevice::drawTextureProducerImpl(GrTextureProducer* producer,
                                          const SkRect& clippedSrcRect,
                                          const SkRect& clippedDstRect,
                                          SkCanvas::SrcRectConstraint constraint,
                                          const SkMatrix& viewMatrix,
                                          const SkMatrix& srcToDstMatrix,
                                          const GrClip& clip,
                                          const SkPaint& paint) {
    // Specifying the texture coords as local coordinates is an attempt to enable more batching
    // by not baking anything about the srcRect, dstRect, or viewMatrix, into the texture FP. In
    // the future this should be an opaque optimization enabled by the combination of batch/GP and
    // FP.
    const SkMaskFilter* mf = paint.getMaskFilter();
    // The shader expects proper local coords, so we can't replace local coords with texture coords
    // if the shader will be used. If we have a mask filter we will change the underlying geometry
    // that is rendered.
    bool canUseTextureCoordsAsLocalCoords = !use_shader(producer->isAlphaOnly(), paint) && !mf;

    bool doBicubic;
    GrTextureParams::FilterMode fm =
        GrSkFilterQualityToGrFilterMode(paint.getFilterQuality(), viewMatrix, srcToDstMatrix,
                                        &doBicubic);
    const GrTextureParams::FilterMode* filterMode = doBicubic ? nullptr : &fm;

    GrTextureAdjuster::FilterConstraint constraintMode;
    if (SkCanvas::kFast_SrcRectConstraint == constraint) {
        constraintMode = GrTextureAdjuster::kNo_FilterConstraint;
    } else {
        constraintMode = GrTextureAdjuster::kYes_FilterConstraint;
    }

    // If we have to outset for AA then we will generate texture coords outside the src rect. The
    // same happens for any mask filter that extends the bounds rendered in the dst.
    // This is conservative as a mask filter does not have to expand the bounds rendered.
    bool coordsAllInsideSrcRect = !paint.isAntiAlias() && !mf;

    // Check for optimization to drop the src rect constraint when on bilerp.
    if (filterMode && GrTextureParams::kBilerp_FilterMode == *filterMode &&
        GrTextureAdjuster::kYes_FilterConstraint == constraintMode && coordsAllInsideSrcRect) {
        SkMatrix combinedMatrix;
        combinedMatrix.setConcat(viewMatrix, srcToDstMatrix);
        if (can_ignore_bilerp_constraint(*producer, clippedSrcRect, combinedMatrix,
                                         fDrawContext->isUnifiedMultisampled())) {
            constraintMode = GrTextureAdjuster::kNo_FilterConstraint;
        }
    }

    const SkMatrix* textureMatrix;
    SkMatrix tempMatrix;
    if (canUseTextureCoordsAsLocalCoords) {
        textureMatrix = &SkMatrix::I();
    } else {
        if (!srcToDstMatrix.invert(&tempMatrix)) {
            return;
        }
        textureMatrix = &tempMatrix;
    }
    sk_sp<GrFragmentProcessor> fp(producer->createFragmentProcessor(
        *textureMatrix, clippedSrcRect, constraintMode, coordsAllInsideSrcRect, filterMode,
        fDrawContext->getColorSpace(), fDrawContext->sourceGammaTreatment()));
    if (!fp) {
        return;
    }

    GrPaint grPaint;
    if (!SkPaintToGrPaintWithTexture(fContext, fDrawContext.get(), paint, viewMatrix, fp,
                                     producer->isAlphaOnly(), &grPaint)) {
        return;
    }

    if (canUseTextureCoordsAsLocalCoords) {
        fDrawContext->fillRectToRect(clip, grPaint, viewMatrix, clippedDstRect, clippedSrcRect);
        return;
    }

    if (!mf) {
        fDrawContext->drawRect(clip, grPaint, viewMatrix, clippedDstRect);
        return;
    }

    // First see if we can do the draw + mask filter direct to the dst.
    if (viewMatrix.isScaleTranslate()) {
        SkRect devClippedDstRect;
        viewMatrix.mapRectScaleTranslate(&devClippedDstRect, clippedDstRect);

        SkStrokeRec rec(SkStrokeRec::kFill_InitStyle);
        if (mf->directFilterRRectMaskGPU(fContext,
                                          fDrawContext.get(),
                                          &grPaint,
                                          clip,
                                          viewMatrix,
                                          rec,
                                          SkRRect::MakeRect(clippedDstRect),
                                          SkRRect::MakeRect(devClippedDstRect))) {
            return;
        }
    }

    SkPath rectPath;
    rectPath.addRect(clippedDstRect);
    rectPath.setIsVolatile(true);
    GrBlurUtils::drawPathWithMaskFilter(this->context(), fDrawContext.get(), fClip,
                                        rectPath, &grPaint, viewMatrix, mf, GrStyle::SimpleFill(),
                                        true);
}