Draw n-patches using OpenGL.
Currently only tested with title bars and buttons.
Change-Id: I8263a9281898dc0e943b1b8412827fe55639b9d6
diff --git a/libs/hwui/Patch.h b/libs/hwui/Patch.h
new file mode 100644
index 0000000..c6af18a
--- /dev/null
+++ b/libs/hwui/Patch.h
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_UI_PATCH_H
+#define ANDROID_UI_PATCH_H
+
+#include <sys/types.h>
+
+#include <cstring>
+
+#include "Vertex.h"
+
+namespace android {
+namespace uirenderer {
+
+/**
+ * Description of a patch.
+ */
+struct PatchDescription {
+ PatchDescription(): xCount(0), yCount(0) { }
+ PatchDescription(const uint32_t xCount, const uint32_t yCount):
+ xCount(xCount), yCount(yCount) { }
+ PatchDescription(const PatchDescription& description):
+ xCount(description.xCount), yCount(description.yCount) { }
+
+ uint32_t xCount;
+ uint32_t yCount;
+
+ bool operator<(const PatchDescription& rhs) const {
+ if (xCount == rhs.xCount) {
+ return yCount < rhs.yCount;
+ }
+ return xCount < rhs.xCount;
+ }
+
+ bool operator==(const PatchDescription& rhs) const {
+ return xCount == rhs.xCount && yCount == rhs.yCount;
+ }
+}; // struct PatchDescription
+
+/**
+ * An OpenGL patch. This contains an array of vertices and an array of
+ * indices to render the vertices.
+ */
+struct Patch {
+ Patch(const uint32_t xCount, const uint32_t yCount): xCount(xCount + 2), yCount(yCount + 2) {
+ verticesCount = (xCount + 2) * (yCount + 2);
+ vertices = new TextureVertex[verticesCount];
+
+ // 2 triangles per patch, 3 vertices per triangle
+ indicesCount = (xCount + 1) * (yCount + 1) * 2 * 3;
+ indices = new uint16_t[indicesCount];
+
+ const uint32_t xNum = xCount + 1;
+ const uint32_t yNum = yCount + 1;
+
+ uint16_t* startIndices = indices;
+ uint32_t n = 0;
+ for (uint32_t y = 0; y < yNum; y++) {
+ for (uint32_t x = 0; x < xNum; x++) {
+ *startIndices++ = n;
+ *startIndices++ = n + 1;
+ *startIndices++ = n + xNum + 2;
+
+ *startIndices++ = n;
+ *startIndices++ = n + xNum + 2;
+ *startIndices++ = n + xNum + 1;
+
+ n += 1;
+ }
+ n += 1;
+ }
+ }
+
+ ~Patch() {
+ delete indices;
+ delete vertices;
+ }
+
+ void dump() {
+ LOGD("Vertices [");
+ for (uint32_t y = 0; y < yCount; y++) {
+ char buffer[512];
+ buffer[0] = '\0';
+ uint32_t offset = 0;
+ for (uint32_t x = 0; x < xCount; x++) {
+ TextureVertex* v = &vertices[y * xCount + x];
+ offset += sprintf(&buffer[offset], " (%.4f,%.4f)-(%.4f,%.4f)",
+ v->position[0], v->position[1], v->texture[0], v->texture[1]);
+ }
+ LOGD(" [%s ]", buffer);
+ }
+ LOGD("]\nIndices [ ");
+ char buffer[4096];
+ buffer[0] = '\0';
+ uint32_t offset = 0;
+ for (uint32_t i = 0; i < indicesCount; i++) {
+ offset += sprintf(&buffer[offset], "%d ", indices[i]);
+ }
+ LOGD(" %s\n]", buffer);
+ }
+
+ uint32_t xCount;
+ uint32_t yCount;
+
+ uint16_t* indices;
+ uint32_t indicesCount;
+
+ TextureVertex* vertices;
+ uint32_t verticesCount;
+}; // struct Patch
+
+}; // namespace uirenderer
+}; // namespace android
+
+#endif // ANDROID_UI_PATCH_H