Refactoring to move vertex computing to the Patch class.
This change is mostly cleanup to keep less code in OpenGLRenderer.
Change-Id: I954375143b2943829457ab470423729b60b844f5
diff --git a/libs/hwui/Patch.cpp b/libs/hwui/Patch.cpp
new file mode 100644
index 0000000..4b6bb37
--- /dev/null
+++ b/libs/hwui/Patch.cpp
@@ -0,0 +1,188 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "OpenGLRenderer"
+
+#include <cstring>
+
+#include <utils/Log.h>
+
+#include "Patch.h"
+
+namespace android {
+namespace uirenderer {
+
+///////////////////////////////////////////////////////////////////////////////
+// Constructors/destructor
+///////////////////////////////////////////////////////////////////////////////
+
+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::~Patch() {
+ delete indices;
+ delete vertices;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Vertices management
+///////////////////////////////////////////////////////////////////////////////
+
+void Patch::updateVertices(const SkBitmap* bitmap, float left, float top, float right,
+ float bottom, const int32_t* xDivs, const int32_t* yDivs, const uint32_t width,
+ const uint32_t height) {
+ const uint32_t xStretchCount = (width + 1) >> 1;
+ const uint32_t yStretchCount = (height + 1) >> 1;
+
+ float xStretch = 0;
+ float yStretch = 0;
+ float xStretchTex = 0;
+ float yStretchTex = 0;
+
+ const float meshWidth = right - left;
+
+ const float bitmapWidth = float(bitmap->width());
+ const float bitmapHeight = float(bitmap->height());
+
+ if (xStretchCount > 0) {
+ uint32_t stretchSize = 0;
+ for (uint32_t i = 1; i < width; i += 2) {
+ stretchSize += xDivs[i] - xDivs[i - 1];
+ }
+ xStretchTex = (stretchSize / bitmapWidth) / xStretchCount;
+ const float fixed = bitmapWidth - stretchSize;
+ xStretch = (right - left - fixed) / xStretchCount;
+ }
+
+ if (yStretchCount > 0) {
+ uint32_t stretchSize = 0;
+ for (uint32_t i = 1; i < height; i += 2) {
+ stretchSize += yDivs[i] - yDivs[i - 1];
+ }
+ yStretchTex = (stretchSize / bitmapHeight) / yStretchCount;
+ const float fixed = bitmapHeight - stretchSize;
+ yStretch = (bottom - top - fixed) / yStretchCount;
+ }
+
+ float vy = 0.0f;
+ float ty = 0.0f;
+ TextureVertex* vertex = vertices;
+
+ generateVertices(vertex, 0.0f, 0.0f, xDivs, width, xStretch, xStretchTex,
+ meshWidth, bitmapWidth);
+ vertex += width + 2;
+
+ for (uint32_t y = 0; y < height; y++) {
+ if (y & 1) {
+ vy += yStretch;
+ ty += yStretchTex;
+ } else {
+ const float step = float(yDivs[y]);
+ vy += step;
+ ty += step / bitmapHeight;
+ }
+ generateVertices(vertex, vy, ty, xDivs, width, xStretch, xStretchTex,
+ meshWidth, bitmapWidth);
+ vertex += width + 2;
+ }
+
+ generateVertices(vertex, bottom - top, 1.0f, xDivs, width, xStretch, xStretchTex,
+ meshWidth, bitmapWidth);
+}
+
+inline void Patch::generateVertices(TextureVertex* vertex, float y, float v,
+ const int32_t xDivs[], uint32_t xCount, float xStretch, float xStretchTex,
+ float width, float widthTex) {
+ float vx = 0.0f;
+ float tx = 0.0f;
+
+ TextureVertex::set(vertex, vx, y, tx, v);
+ vertex++;
+
+ for (uint32_t x = 0; x < xCount; x++) {
+ if (x & 1) {
+ vx += xStretch;
+ tx += xStretchTex;
+ } else {
+ const float step = float(xDivs[x]);
+ vx += step;
+ tx += step / widthTex;
+ }
+
+ TextureVertex::set(vertex, vx, y, tx, v);
+ vertex++;
+ }
+
+ TextureVertex::set(vertex, width, y, 1.0f, v);
+ vertex++;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Debug tools
+///////////////////////////////////////////////////////////////////////////////
+
+void Patch::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);
+}
+
+}; // namespace uirenderer
+}; // namespace android