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Diffstat (limited to 'android/source/src/java/org/mozilla/gecko/gfx/NinePatchTileLayer.java')
| -rw-r--r-- | android/source/src/java/org/mozilla/gecko/gfx/NinePatchTileLayer.java | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/android/source/src/java/org/mozilla/gecko/gfx/NinePatchTileLayer.java b/android/source/src/java/org/mozilla/gecko/gfx/NinePatchTileLayer.java new file mode 100644 index 000000000..99f203961 --- /dev/null +++ b/android/source/src/java/org/mozilla/gecko/gfx/NinePatchTileLayer.java @@ -0,0 +1,131 @@ +/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*- + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +package org.mozilla.gecko.gfx; + +import android.graphics.RectF; +import android.opengl.GLES20; + +import java.nio.FloatBuffer; + +/** + * Encapsulates the logic needed to draw a nine-patch bitmap using OpenGL ES. + * + * For more information on nine-patch bitmaps, see the following document: + * http://developer.android.com/guide/topics/graphics/2d-graphics.html#nine-patch + */ +public class NinePatchTileLayer extends TileLayer { + private static final int PATCH_SIZE = 16; + private static final int TEXTURE_SIZE = 64; + + public NinePatchTileLayer(CairoImage image) { + super(image, PaintMode.NORMAL); + } + + @Override + public void draw(RenderContext context) { + if (!initialized()) + return; + + GLES20.glBlendFunc(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA); + GLES20.glEnable(GLES20.GL_BLEND); + + GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, getTextureID()); + drawPatches(context); + } + + private void drawPatches(RenderContext context) { + /* + * We divide the nine-patch bitmap up as follows: + * + * +---+---+---+ + * | 0 | 1 | 2 | + * +---+---+---+ + * | 3 | | 4 | + * +---+---+---+ + * | 5 | 6 | 7 | + * +---+---+---+ + */ + + // page is the rect of the "missing" center spot in the picture above + RectF page = context.pageRect; + + drawPatch(context, 0, PATCH_SIZE * 3, /* 0 */ + page.left - PATCH_SIZE, page.top - PATCH_SIZE, PATCH_SIZE, PATCH_SIZE); + drawPatch(context, PATCH_SIZE, PATCH_SIZE * 3, /* 1 */ + page.left, page.top - PATCH_SIZE, page.width(), PATCH_SIZE); + drawPatch(context, PATCH_SIZE * 2, PATCH_SIZE * 3, /* 2 */ + page.right, page.top - PATCH_SIZE, PATCH_SIZE, PATCH_SIZE); + drawPatch(context, 0, PATCH_SIZE * 2, /* 3 */ + page.left - PATCH_SIZE, page.top, PATCH_SIZE, page.height()); + drawPatch(context, PATCH_SIZE * 2, PATCH_SIZE * 2, /* 4 */ + page.right, page.top, PATCH_SIZE, page.height()); + drawPatch(context, 0, PATCH_SIZE, /* 5 */ + page.left - PATCH_SIZE, page.bottom, PATCH_SIZE, PATCH_SIZE); + drawPatch(context, PATCH_SIZE, PATCH_SIZE, /* 6 */ + page.left, page.bottom, page.width(), PATCH_SIZE); + drawPatch(context, PATCH_SIZE * 2, PATCH_SIZE, /* 7 */ + page.right, page.bottom, PATCH_SIZE, PATCH_SIZE); + } + + private void drawPatch(RenderContext context, int textureX, int textureY, + float tileX, float tileY, float tileWidth, float tileHeight) { + RectF viewport = context.viewport; + float viewportHeight = viewport.height(); + float drawX = tileX - viewport.left; + float drawY = viewportHeight - (tileY + tileHeight - viewport.top); + + float[] coords = { + //x, y, z, texture_x, texture_y + drawX/viewport.width(), drawY/viewport.height(), 0, + textureX/(float)TEXTURE_SIZE, textureY/(float)TEXTURE_SIZE, + + drawX/viewport.width(), (drawY+tileHeight)/viewport.height(), 0, + textureX/(float)TEXTURE_SIZE, (textureY+PATCH_SIZE)/(float)TEXTURE_SIZE, + + (drawX+tileWidth)/viewport.width(), drawY/viewport.height(), 0, + (textureX+PATCH_SIZE)/(float)TEXTURE_SIZE, textureY/(float)TEXTURE_SIZE, + + (drawX+tileWidth)/viewport.width(), (drawY+tileHeight)/viewport.height(), 0, + (textureX+PATCH_SIZE)/(float)TEXTURE_SIZE, (textureY+PATCH_SIZE)/(float)TEXTURE_SIZE + + }; + + // Get the buffer and handles from the context + FloatBuffer coordBuffer = context.coordBuffer; + int positionHandle = context.positionHandle; + int textureHandle = context.textureHandle; + + // Make sure we are at position zero in the buffer in case other draw methods did not clean + // up after themselves + coordBuffer.position(0); + coordBuffer.put(coords); + + // Unbind any the current array buffer so we can use client side buffers + GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, 0); + + // Vertex coordinates are x,y,z starting at position 0 into the buffer. + coordBuffer.position(0); + GLES20.glVertexAttribPointer(positionHandle, 3, GLES20.GL_FLOAT, false, 20, coordBuffer); + + // Texture coordinates are texture_x, texture_y starting at position 3 into the buffer. + coordBuffer.position(3); + GLES20.glVertexAttribPointer(textureHandle, 2, GLES20.GL_FLOAT, false, 20, coordBuffer); + + GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, + GLES20.GL_CLAMP_TO_EDGE); + GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, + GLES20.GL_CLAMP_TO_EDGE); + + // Use bilinear filtering for both magnification and minimization of the texture. This + // applies only to the shadow layer so we do not incur a high overhead. + GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, + GLES20.GL_LINEAR); + GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, + GLES20.GL_LINEAR); + + GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4); + } +} |