1 files changed, 130 insertions, 0 deletions
diff --git a/libs/hwui/Line.h b/libs/hwui/Line.h
new file mode 100644
index 0000000..64bdd6a
--- /dev/null
+++ b/libs/hwui/Line.h
@@ -0,0 +1,130 @@
+/*
+ * 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_LINE_H
+#define ANDROID_UI_LINE_H
+
+#include <GLES2/gl2.h>
+
+#include <cmath>
+
+#include <sys/types.h>
+
+#include "Patch.h"
+
+namespace android {
+namespace uirenderer {
+
+///////////////////////////////////////////////////////////////////////////////
+// Globals
+///////////////////////////////////////////////////////////////////////////////
+
+// Alpha8 texture used to perform texture anti-aliasing
+static const uint8_t gLineTexture[] = {
+        0,   0,   0,   0, 0,
+        0, 255, 255, 255, 0,
+        0, 255, 255, 255, 0,
+        0, 255, 255, 255, 0,
+        0,   0,   0,   0, 0
+};
+static const GLsizei gLineTextureWidth = 5;
+static const GLsizei gLineTextureHeight = 5;
+static const float gLineAABias = 1.0f;
+
+///////////////////////////////////////////////////////////////////////////////
+// Line
+///////////////////////////////////////////////////////////////////////////////
+
+class Line {
+public:
+    Line(): mXDivsCount(2), mYDivsCount(2) {
+        mPatch = new Patch(mXDivsCount, mYDivsCount);
+        mXDivs = new int32_t[mXDivsCount];
+        mYDivs = new int32_t[mYDivsCount];
+
+        mXDivs[0] = mYDivs[0] = 2;
+        mXDivs[1] = mYDivs[1] = 3;
+
+        glGenTextures(1, &mTexture);
+        glBindTexture(GL_TEXTURE_2D, mTexture);
+
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, gLineTextureWidth, gLineTextureHeight, 0,
+                GL_ALPHA, GL_UNSIGNED_BYTE, gLineTexture);
+    }
+
+    ~Line() {
+        delete mPatch;
+        delete[] mXDivs;
+        delete[] mYDivs;
+
+        glDeleteTextures(1, &mTexture);
+    }
+
+    inline float getLength(float x1, float y1, float x2, float y2) {
+        return sqrtf((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));
+    }
+
+    void update(float x1, float y1, float x2, float y2, float lineWidth, float& tx, float& ty) {
+        const float length = getLength(x1, y1, x2, y2);
+        const float half = lineWidth * 0.5f;
+
+        mPatch->updateVertices(gLineTextureWidth, gLineTextureHeight,
+                -gLineAABias, -half - gLineAABias, length + gLineAABias, half + gLineAABias,
+                mXDivs, mYDivs, mXDivsCount, mYDivsCount);
+
+        tx = -gLineAABias;
+        ty = lineWidth <= 1.0f ? -gLineAABias : -half - gLineAABias;
+    }
+
+    inline GLvoid* getVertices() const {
+        return &mPatch->vertices[0].position[0];
+    }
+
+    inline GLvoid* getTexCoords() const {
+        return &mPatch->vertices[0].texture[0];
+    }
+
+    inline GLsizei getElementsCount() const {
+        return mPatch->verticesCount;
+    }
+
+    inline GLuint getTexture() const {
+        return mTexture;
+    }
+
+private:
+    uint32_t mXDivsCount;
+    uint32_t mYDivsCount;
+
+    int32_t* mXDivs;
+    int32_t* mYDivs;
+
+    Patch* mPatch;
+
+    GLuint mTexture;
+}; // class Line
+
+}; // namespace uirenderer
+}; // namespace android
+
+#endif // ANDROID_UI_LINE_H