#include "SkColorPriv.h"
#include "SkGeometry.h"
+namespace {
+ enum CubicCtrlPts {
+ kTopP0_CubicCtrlPts = 0,
+ kTopP1_CubicCtrlPts = 1,
+ kTopP2_CubicCtrlPts = 2,
+ kTopP3_CubicCtrlPts = 3,
+
+ kRightP0_CubicCtrlPts = 3,
+ kRightP1_CubicCtrlPts = 4,
+ kRightP2_CubicCtrlPts = 5,
+ kRightP3_CubicCtrlPts = 6,
+
+ kBottomP0_CubicCtrlPts = 9,
+ kBottomP1_CubicCtrlPts = 8,
+ kBottomP2_CubicCtrlPts = 7,
+ kBottomP3_CubicCtrlPts = 6,
+
+ kLeftP0_CubicCtrlPts = 0,
+ kLeftP1_CubicCtrlPts = 11,
+ kLeftP2_CubicCtrlPts = 10,
+ kLeftP3_CubicCtrlPts = 9,
+ };
+
+ // Enum for corner also clockwise.
+ enum Corner {
+ kTopLeft_Corner = 0,
+ kTopRight_Corner,
+ kBottomRight_Corner,
+ kBottomLeft_Corner
+ };
+}
+
/**
* Evaluator to sample the values of a cubic bezier using forward differences.
* Forward differences is a method for evaluating a nth degree polynomial at a uniform step by only
// Approximate length of each cubic.
SkPoint pts[kNumPtsCubic];
- SkPatchUtils::getTopCubic(cubics, pts);
+ SkPatchUtils::GetTopCubic(cubics, pts);
matrix->mapPoints(pts, kNumPtsCubic);
SkScalar topLength = approx_arc_length(pts, kNumPtsCubic);
- SkPatchUtils::getBottomCubic(cubics, pts);
+ SkPatchUtils::GetBottomCubic(cubics, pts);
matrix->mapPoints(pts, kNumPtsCubic);
SkScalar bottomLength = approx_arc_length(pts, kNumPtsCubic);
- SkPatchUtils::getLeftCubic(cubics, pts);
+ SkPatchUtils::GetLeftCubic(cubics, pts);
matrix->mapPoints(pts, kNumPtsCubic);
SkScalar leftLength = approx_arc_length(pts, kNumPtsCubic);
- SkPatchUtils::getRightCubic(cubics, pts);
+ SkPatchUtils::GetRightCubic(cubics, pts);
matrix->mapPoints(pts, kNumPtsCubic);
SkScalar rightLength = approx_arc_length(pts, kNumPtsCubic);
return SkISize::Make(SkMax32(8, lodX), SkMax32(8, lodY));
}
-void SkPatchUtils::getTopCubic(const SkPoint cubics[12], SkPoint points[4]) {
+void SkPatchUtils::GetTopCubic(const SkPoint cubics[12], SkPoint points[4]) {
points[0] = cubics[kTopP0_CubicCtrlPts];
points[1] = cubics[kTopP1_CubicCtrlPts];
points[2] = cubics[kTopP2_CubicCtrlPts];
points[3] = cubics[kTopP3_CubicCtrlPts];
}
-void SkPatchUtils::getBottomCubic(const SkPoint cubics[12], SkPoint points[4]) {
+void SkPatchUtils::GetBottomCubic(const SkPoint cubics[12], SkPoint points[4]) {
points[0] = cubics[kBottomP0_CubicCtrlPts];
points[1] = cubics[kBottomP1_CubicCtrlPts];
points[2] = cubics[kBottomP2_CubicCtrlPts];
points[3] = cubics[kBottomP3_CubicCtrlPts];
}
-void SkPatchUtils::getLeftCubic(const SkPoint cubics[12], SkPoint points[4]) {
+void SkPatchUtils::GetLeftCubic(const SkPoint cubics[12], SkPoint points[4]) {
points[0] = cubics[kLeftP0_CubicCtrlPts];
points[1] = cubics[kLeftP1_CubicCtrlPts];
points[2] = cubics[kLeftP2_CubicCtrlPts];
points[3] = cubics[kLeftP3_CubicCtrlPts];
}
-void SkPatchUtils::getRightCubic(const SkPoint cubics[12], SkPoint points[4]) {
+void SkPatchUtils::GetRightCubic(const SkPoint cubics[12], SkPoint points[4]) {
points[0] = cubics[kRightP0_CubicCtrlPts];
points[1] = cubics[kRightP1_CubicCtrlPts];
points[2] = cubics[kRightP2_CubicCtrlPts];
points[3] = cubics[kRightP3_CubicCtrlPts];
}
-bool SkPatchUtils::getVertexData(SkPatchUtils::VertexData* data, const SkPoint cubics[12],
- const SkColor colors[4], const SkPoint texCoords[4], int lodX, int lodY) {
- if (lodX < 1 || lodY < 1 || nullptr == cubics || nullptr == data) {
- return false;
- }
-
- // check for overflow in multiplication
- const int64_t lodX64 = (lodX + 1),
- lodY64 = (lodY + 1),
- mult64 = lodX64 * lodY64;
- if (mult64 > SK_MaxS32) {
- return false;
- }
- data->fVertexCount = SkToS32(mult64);
-
- // it is recommended to generate draw calls of no more than 65536 indices, so we never generate
- // more than 60000 indices. To accomplish that we resize the LOD and vertex count
- if (data->fVertexCount > 10000 || lodX > 200 || lodY > 200) {
- SkScalar weightX = static_cast<SkScalar>(lodX) / (lodX + lodY);
- SkScalar weightY = static_cast<SkScalar>(lodY) / (lodX + lodY);
-
- // 200 comes from the 100 * 2 which is the max value of vertices because of the limit of
- // 60000 indices ( sqrt(60000 / 6) that comes from data->fIndexCount = lodX * lodY * 6)
- lodX = static_cast<int>(weightX * 200);
- lodY = static_cast<int>(weightY * 200);
- data->fVertexCount = (lodX + 1) * (lodY + 1);
- }
- data->fIndexCount = lodX * lodY * 6;
-
- data->fPoints = new SkPoint[data->fVertexCount];
- data->fIndices = new uint16_t[data->fIndexCount];
-
- // if colors is not null then create array for colors
- SkPMColor colorsPM[kNumCorners];
- if (colors) {
- // premultiply colors to avoid color bleeding.
- for (int i = 0; i < kNumCorners; i++) {
- colorsPM[i] = SkPreMultiplyColor(colors[i]);
- }
- data->fColors = new uint32_t[data->fVertexCount];
- }
-
- // if texture coordinates are not null then create array for them
- if (texCoords) {
- data->fTexCoords = new SkPoint[data->fVertexCount];
- }
-
- SkPoint pts[kNumPtsCubic];
- SkPatchUtils::getBottomCubic(cubics, pts);
- FwDCubicEvaluator fBottom(pts);
- SkPatchUtils::getTopCubic(cubics, pts);
- FwDCubicEvaluator fTop(pts);
- SkPatchUtils::getLeftCubic(cubics, pts);
- FwDCubicEvaluator fLeft(pts);
- SkPatchUtils::getRightCubic(cubics, pts);
- FwDCubicEvaluator fRight(pts);
-
- fBottom.restart(lodX);
- fTop.restart(lodX);
-
- SkScalar u = 0.0f;
- int stride = lodY + 1;
- for (int x = 0; x <= lodX; x++) {
- SkPoint bottom = fBottom.next(), top = fTop.next();
- fLeft.restart(lodY);
- fRight.restart(lodY);
- SkScalar v = 0.f;
- for (int y = 0; y <= lodY; y++) {
- int dataIndex = x * (lodY + 1) + y;
-
- SkPoint left = fLeft.next(), right = fRight.next();
-
- SkPoint s0 = SkPoint::Make((1.0f - v) * top.x() + v * bottom.x(),
- (1.0f - v) * top.y() + v * bottom.y());
- SkPoint s1 = SkPoint::Make((1.0f - u) * left.x() + u * right.x(),
- (1.0f - u) * left.y() + u * right.y());
- SkPoint s2 = SkPoint::Make(
- (1.0f - v) * ((1.0f - u) * fTop.getCtrlPoints()[0].x()
- + u * fTop.getCtrlPoints()[3].x())
- + v * ((1.0f - u) * fBottom.getCtrlPoints()[0].x()
- + u * fBottom.getCtrlPoints()[3].x()),
- (1.0f - v) * ((1.0f - u) * fTop.getCtrlPoints()[0].y()
- + u * fTop.getCtrlPoints()[3].y())
- + v * ((1.0f - u) * fBottom.getCtrlPoints()[0].y()
- + u * fBottom.getCtrlPoints()[3].y()));
- data->fPoints[dataIndex] = s0 + s1 - s2;
-
- if (colors) {
- uint8_t a = uint8_t(bilerp(u, v,
- SkScalar(SkColorGetA(colorsPM[kTopLeft_Corner])),
- SkScalar(SkColorGetA(colorsPM[kTopRight_Corner])),
- SkScalar(SkColorGetA(colorsPM[kBottomLeft_Corner])),
- SkScalar(SkColorGetA(colorsPM[kBottomRight_Corner]))));
- uint8_t r = uint8_t(bilerp(u, v,
- SkScalar(SkColorGetR(colorsPM[kTopLeft_Corner])),
- SkScalar(SkColorGetR(colorsPM[kTopRight_Corner])),
- SkScalar(SkColorGetR(colorsPM[kBottomLeft_Corner])),
- SkScalar(SkColorGetR(colorsPM[kBottomRight_Corner]))));
- uint8_t g = uint8_t(bilerp(u, v,
- SkScalar(SkColorGetG(colorsPM[kTopLeft_Corner])),
- SkScalar(SkColorGetG(colorsPM[kTopRight_Corner])),
- SkScalar(SkColorGetG(colorsPM[kBottomLeft_Corner])),
- SkScalar(SkColorGetG(colorsPM[kBottomRight_Corner]))));
- uint8_t b = uint8_t(bilerp(u, v,
- SkScalar(SkColorGetB(colorsPM[kTopLeft_Corner])),
- SkScalar(SkColorGetB(colorsPM[kTopRight_Corner])),
- SkScalar(SkColorGetB(colorsPM[kBottomLeft_Corner])),
- SkScalar(SkColorGetB(colorsPM[kBottomRight_Corner]))));
- data->fColors[dataIndex] = SkPackARGB32(a,r,g,b);
- }
-
- if (texCoords) {
- data->fTexCoords[dataIndex] = SkPoint::Make(
- bilerp(u, v, texCoords[kTopLeft_Corner].x(),
- texCoords[kTopRight_Corner].x(),
- texCoords[kBottomLeft_Corner].x(),
- texCoords[kBottomRight_Corner].x()),
- bilerp(u, v, texCoords[kTopLeft_Corner].y(),
- texCoords[kTopRight_Corner].y(),
- texCoords[kBottomLeft_Corner].y(),
- texCoords[kBottomRight_Corner].y()));
-
- }
-
- if(x < lodX && y < lodY) {
- int i = 6 * (x * lodY + y);
- data->fIndices[i] = x * stride + y;
- data->fIndices[i + 1] = x * stride + 1 + y;
- data->fIndices[i + 2] = (x + 1) * stride + 1 + y;
- data->fIndices[i + 3] = data->fIndices[i];
- data->fIndices[i + 4] = data->fIndices[i + 2];
- data->fIndices[i + 5] = (x + 1) * stride + y;
- }
- v = SkScalarClampMax(v + 1.f / lodY, 1);
- }
- u = SkScalarClampMax(u + 1.f / lodX, 1);
- }
- return true;
-
-}
-
-///////////////////////////////////////////////////////////////////////////////////////////////////
-
sk_sp<SkVertices> SkPatchUtils::MakeVertices(const SkPoint cubics[12], const SkColor srcColors[4],
const SkPoint srcTexCoords[4], int lodX, int lodY) {
if (lodX < 1 || lodY < 1 || nullptr == cubics) {
}
SkPoint pts[kNumPtsCubic];
- SkPatchUtils::getBottomCubic(cubics, pts);
+ SkPatchUtils::GetBottomCubic(cubics, pts);
FwDCubicEvaluator fBottom(pts);
- SkPatchUtils::getTopCubic(cubics, pts);
+ SkPatchUtils::GetTopCubic(cubics, pts);
FwDCubicEvaluator fTop(pts);
- SkPatchUtils::getLeftCubic(cubics, pts);
+ SkPatchUtils::GetLeftCubic(cubics, pts);
FwDCubicEvaluator fLeft(pts);
- SkPatchUtils::getRightCubic(cubics, pts);
+ SkPatchUtils::GetRightCubic(cubics, pts);
FwDCubicEvaluator fRight(pts);
fBottom.restart(lodX);
class SK_API SkPatchUtils {
public:
- // DEPRECATED -- use MakeVertices()
- /**
- * Structure that holds the vertex data related to the tessellation of a patch. It is passed
- * as a parameter to the function getVertexData which sets the points, colors and texture
- * coordinates of the vertices and the indices for them to be drawn as triangles.
- */
- struct VertexData {
- int fVertexCount, fIndexCount;
- SkPoint* fPoints;
- SkPoint* fTexCoords;
- uint32_t* fColors;
- uint16_t* fIndices;
-
- VertexData()
- : fVertexCount(0)
- , fIndexCount(0)
- , fPoints(nullptr)
- , fTexCoords(nullptr)
- , fColors(nullptr)
- , fIndices(nullptr) { }
-
- ~VertexData() {
- delete[] fPoints;
- delete[] fTexCoords;
- delete[] fColors;
- delete[] fIndices;
- }
- };
-
// Enums for control points based on the order specified in the constructor (clockwise).
- enum CubicCtrlPts {
- kTopP0_CubicCtrlPts = 0,
- kTopP1_CubicCtrlPts = 1,
- kTopP2_CubicCtrlPts = 2,
- kTopP3_CubicCtrlPts = 3,
-
- kRightP0_CubicCtrlPts = 3,
- kRightP1_CubicCtrlPts = 4,
- kRightP2_CubicCtrlPts = 5,
- kRightP3_CubicCtrlPts = 6,
-
- kBottomP0_CubicCtrlPts = 9,
- kBottomP1_CubicCtrlPts = 8,
- kBottomP2_CubicCtrlPts = 7,
- kBottomP3_CubicCtrlPts = 6,
-
- kLeftP0_CubicCtrlPts = 0,
- kLeftP1_CubicCtrlPts = 11,
- kLeftP2_CubicCtrlPts = 10,
- kLeftP3_CubicCtrlPts = 9,
- };
-
- // Enum for corner also clockwise.
- enum Corner {
- kTopLeft_Corner = 0,
- kTopRight_Corner,
- kBottomRight_Corner,
- kBottomLeft_Corner
- };
-
enum {
kNumCtrlPts = 12,
kNumCorners = 4,
};
/**
- * Method that calculates a level of detail (number of subdivisions) for a patch in both axis.
- */
- static SkISize GetLevelOfDetail(const SkPoint cubics[12], const SkMatrix* matrix);
-
- /**
* Get the points corresponding to the top cubic of cubics.
*/
- static void getTopCubic(const SkPoint cubics[12], SkPoint points[4]);
+ static void GetTopCubic(const SkPoint cubics[12], SkPoint points[4]);
/**
* Get the points corresponding to the bottom cubic of cubics.
*/
- static void getBottomCubic(const SkPoint cubics[12], SkPoint points[4]);
+ static void GetBottomCubic(const SkPoint cubics[12], SkPoint points[4]);
/**
* Get the points corresponding to the left cubic of cubics.
*/
- static void getLeftCubic(const SkPoint cubics[12], SkPoint points[4]);
+ static void GetLeftCubic(const SkPoint cubics[12], SkPoint points[4]);
/**
* Get the points corresponding to the right cubic of cubics.
*/
- static void getRightCubic(const SkPoint cubics[12], SkPoint points[4]);
+ static void GetRightCubic(const SkPoint cubics[12], SkPoint points[4]);
- // DEPRECATED -- use MakeVertices()
/**
- * Function that evaluates the coons patch interpolation.
- * data refers to the pointer of the PatchData struct in which the tessellation data is set.
- * cubics refers to the points of the cubics.
- * lod refers the level of detail for each axis.
- * colors refers to the corner colors that will be bilerp across the patch (optional parameter)
- * texCoords refers to the corner texture coordinates that will be bilerp across the patch
- (optional parameter)
+ * Method that calculates a level of detail (number of subdivisions) for a patch in both axis.
*/
- static bool getVertexData(SkPatchUtils::VertexData* data, const SkPoint cubics[12],
- const SkColor colors[4], const SkPoint texCoords[4],
- int lodX, int lodY);
+ static SkISize GetLevelOfDetail(const SkPoint cubics[12], const SkMatrix* matrix);
static sk_sp<SkVertices> MakeVertices(const SkPoint cubics[12], const SkColor colors[4],
const SkPoint texCoords[4], int lodX, int lodY);
projects / platform / upstream / libSkiaSharp.git / commitdiff