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Unified Diff: src/utils/SkPatchGrid.h

Issue 451723003: SkPatchGrid interface (after SkPatch/SkPicture rebase). (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Use fXferMode Created 6 years, 4 months ago
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Index: src/utils/SkPatchGrid.h
diff --git a/src/utils/SkPatchGrid.h b/src/utils/SkPatchGrid.h
new file mode 100644
index 0000000000000000000000000000000000000000..cf90098c6829b841fa3b9d665983ae12bc3b882d
--- /dev/null
+++ b/src/utils/SkPatchGrid.h
@@ -0,0 +1,144 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkPatchGrid_DEFINED
+#define SkPatchGrid_DEFINED
+
+#include "SkCanvas.h"
+#include "SkPatchUtils.h"
+#include "SkXfermode.h"
+
+/**
+ * Class that represents a grid of patches. Adjacent patches share their corners and a color is
+ * specified at each one of them. The colors are bilinearly interpolated across the patch.
+ *
+ * This implementation defines a bidimensional array of patches. There are 3 arrays to store the
+ * control points of the patches to avoid storing repeated data since there are several points
+ * shared between adjacent patches.
+ *
+ * The array fCornerPts stores the corner control points of the patches.
+ * The array fHrzPts holds the intermidiate control points of the top and bottom curves of a patch.
+ * The array fVrtPts holds the intermidiate control points of the left and right curves of a patch.
+ * The array fCornerColors holds the corner colors in the same format as fCornerPts.
+ * The array fTexCoords holds the texture coordinates in the same format as fCornerpts.
+ *
+ * fCornerPts fHrzPts fVrtPts
+ * -------------- ------------------- --------------
+ * | C0 | C1 | C2 | | H0 | H1 | H2 | H3 | | V0 | V1 | V2 |
+ * -------------- ------------------ ---------------
+ * | C3 | C4 | C5 | | H4 | H5 | H6 | H7 | | V4 | V5 | V6 |
+ * -------------- ------------------- --------------
+ * | C6 | C7 | C8 | | H8 | H9 | H10| H11| | V6 | V7 | V8 |
+ * -------------- ------------------- --------------
+ * | V9 | V10| V11|
+ * --------------
+ *
+ * With the above configuration we would have a 2x2 grid of patches:
+ * H0 H1 H2 H3
+ * / \/ \
+ * C0-------C1-------C2
+ * /| | |\
+ * v0 | v1 | v2
+ * v3 | V4 | v5
+ * \| | |/
+ * C3-H4-H5-C4-H6-H7-C5
+ * /| | |\
+ * v6 | v7 | v8
+ * v9 | v10 | v11
+ * \| | |/
+ * C6-------C7-------C8
+ * \ / \ /
+ * H8 H9 H10 H11
+ *
+ * When trying to get a patch at a certain position it justs builds it with the corresponding
+ * points.
+ * When adding a patch it tries to add the points at their corresponding position trying to comply
+ * with the adjacent points or overwriting them.
+ *
+ * Based the idea on the SVG2 spec for mesh gradients in which a grid of patches is build as in the
+ * the following example:
+ * <meshGradient x="100" y="100">
+ * <meshRow>
+ * <meshPatch>
+ * <stop .../>
+ * Up to four stops in first patch. See details below.
+ * </meshPatch>
+ * <meshPatch>
+ * Any number of meshPatches in row.
+ * </meshPatch>
+ * </meshRow>
+ * <meshRow>
+ * Any number of meshRows, each with the same number of meshPatches as in the first row.
+ * </meshRow>
+ * </meshGradient>
+ */
+class SkPatchGrid {
+
+public:
+
+ enum VertexType {
+ kNone_VertexType = 0X00,
+ kColors_VertexType = 0x01,
+ kTexs_VertexType = 0x02,
+ kColorsAndTexs_VertexType = 0x03
+ };
+
+ SkPatchGrid(int rows = 0, int cols = 0, VertexType flags = kNone_VertexType,
+ SkXfermode* xfer = NULL);
+
+ ~SkPatchGrid();
+
+ /**
+ * Add a patch at location (x,y) overwriting the previous patch and shared points so they
+ * mantain C0 connectivity.
+ * The control points must be passed in a clockwise order starting at the top left corner.
+ * The colors and texCoords are the values at the corners of the patch which will be bilerp
+ * across it, they must also be in counterclockwise order starting at the top left corner.
+ */
+ bool setPatch(int x, int y, const SkPoint cubics[12], const SkColor colors[4],
+ const SkPoint texCoords[4]);
+
+ /**
+ * Get patch at location (x,y). If cubics, colors or texCoords is not NULL it sets patch's
+ * array with its corresponding values.
+ * The function returns false if the cubics parameter is NULL or if the (x,y) coordinates are
+ * not within the range of the grid.
+ */
+ bool getPatch(int x, int y, SkPoint cubics[12], SkColor colors[4], SkPoint texCoords[4]) const;
+
+ /**
+ * Resets the grid of patches to contain rows and cols of patches.
+ */
+ void reset(int rows, int cols, VertexType flags, SkXfermode* xMode);
+
+ /**
+ * Draws the grid of patches. The patches are drawn starting at patch (0,0) drawing columns, so
+ * for a 2x2 grid the order would be (0,0)->(0,1)->(1,0)->(1,1). The order follows the order
+ * of the parametric coordinates of the coons patch.
+ */
+ void draw(SkCanvas* canvas, SkPaint& paint);
+
+ /**
+ * Get the dimensions of the grid of patches.
+ */
+ SkISize getDimensions() const {
+ return SkISize::Make(fCols, fRows);
+ }
+
+private:
+ int fRows, fCols;
+ VertexType fModeFlags;
+ SkPoint* fCornerPts;
+ SkColor* fCornerColors;
+ SkPoint* fTexCoords;
+ SkPoint* fHrzCtrlPts;
+ SkPoint* fVrtCtrlPts;
+ SkXfermode* fXferMode;
+};
+
+
+#endif
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