diff options
Diffstat (limited to 'cmds/screenrecord/TextRenderer.h')
-rw-r--r-- | cmds/screenrecord/TextRenderer.h | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/cmds/screenrecord/TextRenderer.h b/cmds/screenrecord/TextRenderer.h new file mode 100644 index 0000000..03dd2fb --- /dev/null +++ b/cmds/screenrecord/TextRenderer.h @@ -0,0 +1,140 @@ +/* + * 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; } + + // Convert an ASCII character to a glyph index. Returns the glyph for + // '?' if we have no glyph for the specified character. + size_t glyphIndex(char ch) const; + + 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*/ |