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+/*
+ * Copyright 2013 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 SCREENRECORD_TEXT_RENDER_H
+#define SCREENRECORD_TEXT_RENDER_H
+
+#include "Program.h"
+
+#include <utils/String8.h>
+#include <utils/Errors.h>
+
+#include <GLES2/gl2.h>
+
+
+namespace android {
+
+/*
+ * Simple font representation.
+ *
+ * Not thread-safe.
+ */
+class TextRenderer {
+public:
+ TextRenderer() :
+ mTextureName(0),
+ mScale(1.0f),
+ mBorderWidth(10.0f),
+ mIndentMult(30.0f),
+ mScreenWidth(0),
+ mScreenHeight(0)
+ {}
+ ~TextRenderer() {}
+
+ // Load the glyph bitmap into a 2D texture in the current context.
+ status_t loadIntoTexture();
+
+ // Set the screen dimensions, used for scaling and line wrap.
+ void setScreenSize(uint32_t width, uint32_t height) {
+ mScreenWidth = width;
+ mScreenHeight = height;
+ }
+
+ // Get/set the font scaling.
+ float getScale() const { return mScale; }
+ void setScale(float scale) { mScale = scale; }
+
+ // Set the font scaling based on the desired number of lines per screen.
+ // The display's tallest axis is used, so if the device is in landscape
+ // the screen will fit fewer lines.
+ void setProportionalScale(float linesPerScreen);
+
+ // Render the text string at the specified coordinates. Pass in the
+ // upper-left corner in non-GL-flipped coordinates, i.e. to print text
+ // at the top left of the screen use (0,0).
+ //
+ // Set blend func (1, 1-srcAlpha) before calling if drawing onto
+ // something other than black.
+ void drawString(const Program& program, const float* texMatrix,
+ float x, float y, const String8& str) const;
+
+ // Draw a string, possibly wrapping it at the screen boundary. Top-left
+ // is at (0,0).
+ //
+ // Returns the updated Y position.
+ float drawWrappedString(const Program& texRender, float xpos, float ypos,
+ const String8& str);
+
+ // Returns the name of the texture the font was loaded into.
+ GLuint getTextureName() const { return mTextureName; }
+
+private:
+ TextRenderer(const TextRenderer&);
+ TextRenderer& operator=(const TextRenderer&);
+
+ // Perform one-time initialization.
+ static void initOnce();
+
+ // Populate the mXOffset array.
+ static void initXOffset();
+
+ // Find a good place to break the string. Returns NULL if the entire
+ // string will fit.
+ char* breakString(const char* str, float maxWidth) const;
+
+ // Computes the width of the string, in pixels.
+ float computeScaledStringWidth(const String8& str8) const;
+
+ // Computes the width of first N characters in the string.
+ float computeScaledStringWidth(const char* str, size_t len) const;
+
+ // Returns the font's glyph height. This is the full pixel height of the
+ // tallest glyph, both above and below the baseline, NOT adjusted by the
+ // current scale factor.
+ float getGlyphHeight() const;
+
+ // Like getGlyphHeight(), but result is scaled.
+ float getScaledGlyphHeight() const { return getGlyphHeight() * mScale; }
+
+ GLuint mTextureName;
+ float mScale;
+
+ // Number of pixels preserved at the left/right edges of the screen by
+ // drawWrappedString(). Not scaled.
+ float mBorderWidth;
+
+ // Distance to indent a broken line. Used by drawWrappedString().
+ // Value will be adjusted by the current scale factor.
+ float mIndentMult;
+
+ // Screen dimensions.
+ uint32_t mScreenWidth;
+ uint32_t mScreenHeight;
+
+ // Static font info.
+ static bool mInitialized;
+ static uint32_t mXOffset[];
+
+ static const char kWhitespace[];
+};
+
+}; // namespace android
+
+#endif /*SCREENRECORD_TEXT_RENDER_H*/