You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
233 lines
9.9 KiB
233 lines
9.9 KiB
/*
|
|
* Copyright 2018 Google Inc.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
#include "gm/gm.h"
|
|
#include "include/core/SkCanvas.h"
|
|
#include "include/core/SkColor.h"
|
|
#include "include/core/SkMatrix.h"
|
|
#include "include/core/SkPaint.h"
|
|
#include "include/core/SkPath.h"
|
|
#include "include/core/SkPoint.h"
|
|
#include "include/core/SkRect.h"
|
|
#include "include/core/SkSize.h"
|
|
#include "include/core/SkString.h"
|
|
#include "include/core/SkTypes.h"
|
|
#include "include/gpu/GrContextOptions.h"
|
|
#include "include/gpu/GrRecordingContext.h"
|
|
#include "src/core/SkGeometry.h"
|
|
#include "src/gpu/GrDrawingManager.h"
|
|
#include "src/gpu/GrRecordingContextPriv.h"
|
|
#include "src/gpu/tessellate/GrTessellationPathRenderer.h"
|
|
|
|
static constexpr float kStrokeWidth = 30;
|
|
static constexpr int kCellSize = 200;
|
|
static constexpr int kNumCols = 5;
|
|
static constexpr int kNumRows = 5;
|
|
static constexpr int kTestWidth = kNumCols * kCellSize;
|
|
static constexpr int kTestHeight = kNumRows * kCellSize;
|
|
|
|
enum class CellFillMode {
|
|
kStretch,
|
|
kCenter
|
|
};
|
|
|
|
struct TrickyCubic {
|
|
SkPoint fPoints[4];
|
|
int fNumPts;
|
|
CellFillMode fFillMode;
|
|
float fScale = 1;
|
|
};
|
|
|
|
// This is a compilation of cubics that have given strokers grief. Feel free to add more.
|
|
static const TrickyCubic kTrickyCubics[] = {
|
|
{{{122, 737}, {348, 553}, {403, 761}, {400, 760}}, 4, CellFillMode::kStretch},
|
|
{{{244, 520}, {244, 518}, {1141, 634}, {394, 688}}, 4, CellFillMode::kStretch},
|
|
{{{550, 194}, {138, 130}, {1035, 246}, {288, 300}}, 4, CellFillMode::kStretch},
|
|
{{{226, 733}, {556, 779}, {-43, 471}, {348, 683}}, 4, CellFillMode::kStretch},
|
|
{{{268, 204}, {492, 304}, {352, 23}, {433, 412}}, 4, CellFillMode::kStretch},
|
|
{{{172, 480}, {396, 580}, {256, 299}, {338, 677}}, 4, CellFillMode::kStretch},
|
|
{{{731, 340}, {318, 252}, {1026, -64}, {367, 265}}, 4, CellFillMode::kStretch},
|
|
{{{475, 708}, {62, 620}, {770, 304}, {220, 659}}, 4, CellFillMode::kStretch},
|
|
{{{0, 0}, {128, 128}, {128, 0}, {0, 128}}, 4, CellFillMode::kCenter}, // Perfect cusp
|
|
{{{0,.01f}, {128,127.999f}, {128,.01f}, {0,127.99f}}, 4, CellFillMode::kCenter}, // Near-cusp
|
|
{{{0,-.01f}, {128,128.001f}, {128,-.01f}, {0,128.001f}}, 4, CellFillMode::kCenter}, // Near-cusp
|
|
{{{0,0}, {0,-10}, {0,-10}, {0,10}}, 4, CellFillMode::kCenter, 1.098283f}, // Flat line with 180
|
|
{{{10,0}, {0,0}, {20,0}, {10,0}}, 4, CellFillMode::kStretch}, // Flat line with 2 180s
|
|
{{{39,-39}, {40,-40}, {40,-40}, {0,0}}, 4, CellFillMode::kStretch}, // Flat diagonal with 180
|
|
{{{40, 40}, {0, 0}, {200, 200}, {0, 0}}, 4, CellFillMode::kStretch}, // Diag w/ an internal 180
|
|
{{{0,0}, {1e-2f,0}, {-1e-2f,0}, {0,0}}, 4, CellFillMode::kCenter}, // Circle
|
|
{{{400.75f,100.05f}, {400.75f,100.05f}, {100.05f,300.95f}, {100.05f,300.95f}}, 4,
|
|
CellFillMode::kStretch}, // Flat line with no turns
|
|
{{{0.5f,0}, {0,0}, {20,0}, {10,0}}, 4, CellFillMode::kStretch}, // Flat line with 2 180s
|
|
{{{10,0}, {0,0}, {10,0}, {10,0}}, 4, CellFillMode::kStretch}, // Flat line with a 180
|
|
{{{1,1}, {2,1}, {1,1}, {1, std::numeric_limits<float>::quiet_NaN()}}, 3,
|
|
CellFillMode::kStretch}, // Flat QUAD with a cusp
|
|
{{{1,1}, {100,1}, {25,1}, {.3f, std::numeric_limits<float>::quiet_NaN()}}, 3,
|
|
CellFillMode::kStretch}, // Flat CONIC with a cusp
|
|
{{{1,1}, {100,1}, {25,1}, {1.5f, std::numeric_limits<float>::quiet_NaN()}}, 3,
|
|
CellFillMode::kStretch}, // Flat CONIC with a cusp
|
|
};
|
|
|
|
static SkRect calc_tight_cubic_bounds(const SkPoint P[4], int depth=5) {
|
|
if (0 == depth) {
|
|
SkRect bounds;
|
|
bounds.fLeft = std::min(std::min(P[0].x(), P[1].x()), std::min(P[2].x(), P[3].x()));
|
|
bounds.fTop = std::min(std::min(P[0].y(), P[1].y()), std::min(P[2].y(), P[3].y()));
|
|
bounds.fRight = std::max(std::max(P[0].x(), P[1].x()), std::max(P[2].x(), P[3].x()));
|
|
bounds.fBottom = std::max(std::max(P[0].y(), P[1].y()), std::max(P[2].y(), P[3].y()));
|
|
return bounds;
|
|
}
|
|
|
|
SkPoint chopped[7];
|
|
SkChopCubicAt(P, chopped, .5f);
|
|
SkRect bounds = calc_tight_cubic_bounds(chopped, depth - 1);
|
|
bounds.join(calc_tight_cubic_bounds(chopped+3, depth - 1));
|
|
return bounds;
|
|
}
|
|
|
|
static SkPoint lerp(const SkPoint& a, const SkPoint& b, float T) {
|
|
SkASSERT(1 != T); // The below does not guarantee lerp(a, b, 1) === b.
|
|
return (b - a) * T + a;
|
|
}
|
|
|
|
enum class FillMode {
|
|
kCenter,
|
|
kScale
|
|
};
|
|
|
|
static void draw_test(SkCanvas* canvas, SkPaint::Cap cap, SkPaint::Join join) {
|
|
SkRandom rand;
|
|
|
|
if (canvas->recordingContext() &&
|
|
canvas->recordingContext()->priv().caps()->shaderCaps()->tessellationSupport() &&
|
|
canvas->recordingContext()->priv().caps()->shaderCaps()->maxTessellationSegments() < 64) {
|
|
// There are fewer tessellation segments than the spec minimum. It must have been overriden
|
|
// for testing. Indicate this in the background color.
|
|
canvas->clear(SkColorSetARGB(255, 64, 0, 0));
|
|
} else {
|
|
canvas->clear(SK_ColorBLACK);
|
|
}
|
|
|
|
SkPaint strokePaint;
|
|
strokePaint.setAntiAlias(true);
|
|
strokePaint.setStrokeWidth(kStrokeWidth);
|
|
strokePaint.setStyle(SkPaint::kStroke_Style);
|
|
strokePaint.setStrokeCap(cap);
|
|
strokePaint.setStrokeJoin(join);
|
|
|
|
for (size_t i = 0; i < SK_ARRAY_COUNT(kTrickyCubics); ++i) {
|
|
auto [originalPts, numPts, fillMode, scale] = kTrickyCubics[i];
|
|
|
|
SkASSERT(numPts <= 4);
|
|
SkPoint p[4];
|
|
memcpy(p, originalPts, sizeof(SkPoint) * numPts);
|
|
for (int j = 0; j < numPts; ++j) {
|
|
p[j] *= scale;
|
|
}
|
|
float w = originalPts[3].fX;
|
|
|
|
auto cellRect = SkRect::MakeXYWH((i % kNumCols) * kCellSize, (i / kNumCols) * kCellSize,
|
|
kCellSize, kCellSize);
|
|
|
|
SkRect strokeBounds;
|
|
if (numPts == 4) {
|
|
strokeBounds = calc_tight_cubic_bounds(p);
|
|
} else {
|
|
SkASSERT(numPts == 3);
|
|
SkPoint asCubic[4] = {p[0], lerp(p[0], p[1], 2/3.f), lerp(p[1], p[2], 1/3.f), p[2]};
|
|
strokeBounds = calc_tight_cubic_bounds(asCubic);
|
|
}
|
|
strokeBounds.outset(kStrokeWidth, kStrokeWidth);
|
|
|
|
SkMatrix matrix;
|
|
if (fillMode == CellFillMode::kStretch) {
|
|
matrix = SkMatrix::RectToRect(strokeBounds, cellRect, SkMatrix::kCenter_ScaleToFit);
|
|
} else {
|
|
matrix.setTranslate(cellRect.x() + kStrokeWidth +
|
|
(cellRect.width() - strokeBounds.width()) / 2,
|
|
cellRect.y() + kStrokeWidth +
|
|
(cellRect.height() - strokeBounds.height()) / 2);
|
|
}
|
|
|
|
SkAutoCanvasRestore acr(canvas, true);
|
|
canvas->concat(matrix);
|
|
strokePaint.setStrokeWidth(kStrokeWidth / matrix.getMaxScale());
|
|
strokePaint.setColor(rand.nextU() | 0xff808080);
|
|
SkPath path = SkPath().moveTo(p[0]);
|
|
if (numPts == 4) {
|
|
path.cubicTo(p[1], p[2], p[3]);
|
|
} else if (w == 1) {
|
|
SkASSERT(numPts == 3);
|
|
path.quadTo(p[1], p[2]);
|
|
} else {
|
|
SkASSERT(numPts == 3);
|
|
path.conicTo(p[1], p[2], w);
|
|
}
|
|
canvas->drawPath(path, strokePaint);
|
|
}
|
|
}
|
|
|
|
DEF_SIMPLE_GM(trickycubicstrokes, canvas, kTestWidth, kTestHeight) {
|
|
draw_test(canvas, SkPaint::kButt_Cap, SkPaint::kMiter_Join);
|
|
}
|
|
|
|
DEF_SIMPLE_GM(trickycubicstrokes_roundcaps, canvas, kTestWidth, kTestHeight) {
|
|
draw_test(canvas, SkPaint::kRound_Cap, SkPaint::kRound_Join);
|
|
}
|
|
|
|
class TrickyCubicStrokes_tess_segs_5 : public skiagm::GpuGM {
|
|
SkString onShortName() override {
|
|
return SkString("trickycubicstrokes_tess_segs_5");
|
|
}
|
|
|
|
SkISize onISize() override {
|
|
return SkISize::Make(kTestWidth, kTestHeight);
|
|
}
|
|
|
|
// Pick a very small, odd (and better yet, prime) number of segments.
|
|
//
|
|
// - Odd because it makes the tessellation strip asymmetric, which will be important to test for
|
|
// future plans that involve drawing in reverse order.
|
|
//
|
|
// - >=4 because the tessellator code will just assume we have enough to combine a miter join
|
|
// and line in a single patch. (Requires 4 segments. Spec required minimum is 64.)
|
|
static constexpr int kMaxTessellationSegmentsOverride = 5;
|
|
|
|
void modifyGrContextOptions(GrContextOptions* options) override {
|
|
options->fMaxTessellationSegmentsOverride = kMaxTessellationSegmentsOverride;
|
|
// Only allow the tessellation path renderer.
|
|
options->fGpuPathRenderers = (GpuPathRenderers)((int)options->fGpuPathRenderers &
|
|
(int)GpuPathRenderers::kTessellation);
|
|
}
|
|
|
|
DrawResult onDraw(GrRecordingContext* context, GrSurfaceDrawContext*, SkCanvas* canvas,
|
|
SkString* errorMsg) override {
|
|
if (!context->priv().caps()->shaderCaps()->tessellationSupport() ||
|
|
!GrTessellationPathRenderer::IsSupported(*context->priv().caps())) {
|
|
errorMsg->set("Tessellation not supported.");
|
|
return DrawResult::kSkip;
|
|
}
|
|
auto opts = context->priv().drawingManager()->testingOnly_getOptionsForPathRendererChain();
|
|
if (!(opts.fGpuPathRenderers & GpuPathRenderers::kTessellation)) {
|
|
errorMsg->set("GrTessellationPathRenderer disabled.");
|
|
return DrawResult::kSkip;
|
|
}
|
|
if (context->priv().caps()->shaderCaps()->maxTessellationSegments() !=
|
|
kMaxTessellationSegmentsOverride) {
|
|
errorMsg->set("modifyGrContextOptions did not affect maxTessellationSegments. "
|
|
"(Are you running viewer? If so use '--maxTessellationSegments 5'.)");
|
|
return DrawResult::kFail;
|
|
}
|
|
// Suppress a tessellator warning message that caps.maxTessellationSegments is too small.
|
|
GrRecordingContextPriv::AutoSuppressWarningMessages aswm(context);
|
|
draw_test(canvas, SkPaint::kButt_Cap, SkPaint::kMiter_Join);
|
|
return DrawResult::kOk;
|
|
}
|
|
};
|
|
|
|
DEF_GM( return new TrickyCubicStrokes_tess_segs_5; )
|