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/*******************************************************************************
* Copyright 2011 See AUTHORS file.
*
* 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.
******************************************************************************/
package com.badlogic.gdx.graphics.g2d;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.g2d.BitmapFont.BitmapFontData;
import com.badlogic.gdx.graphics.g2d.BitmapFont.Glyph;
import com.badlogic.gdx.graphics.g2d.GlyphLayout.GlyphRun;
import com.badlogic.gdx.utils.Align;
import com.badlogic.gdx.utils.Array;
import com.badlogic.gdx.utils.FloatArray;
import com.badlogic.gdx.utils.IntArray;
import com.badlogic.gdx.utils.NumberUtils;
import com.badlogic.gdx.utils.Pools;
/** Caches glyph geometry for a BitmapFont, providing a fast way to render static text. This saves needing to compute the glyph
* geometry each frame.
* @author Nathan Sweet
* @author davebaol
* @author Alexander Dorokhov */
public class BitmapFontCache {
static private final Color tempColor = new Color(1, 1, 1, 1);
private final BitmapFont font;
private boolean integer;
private final Array layouts = new Array();
private final Array pooledLayouts = new Array();
private int glyphCount;
private float x, y;
private final Color color = new Color(1, 1, 1, 1);
private float currentTint;
/** Vertex data per page. */
private float[][] pageVertices;
/** Number of vertex data entries per page. */
private int[] idx;
/** For each page, an array with a value for each glyph from that page, where the value is the index of the character in the
* full text being cached. */
private IntArray[] pageGlyphIndices;
/** Used internally to ensure a correct capacity for multi-page font vertex data. */
private int[] tempGlyphCount;
public BitmapFontCache (BitmapFont font) {
this(font, font.usesIntegerPositions());
}
/** @param integer If true, rendering positions will be at integer values to avoid filtering artifacts. */
public BitmapFontCache (BitmapFont font, boolean integer) {
this.font = font;
this.integer = integer;
int pageCount = font.regions.size;
if (pageCount == 0) throw new IllegalArgumentException("The specified font must contain at least one texture page.");
pageVertices = new float[pageCount][];
idx = new int[pageCount];
if (pageCount > 1) {
// Contains the indices of the glyph in the cache as they are added.
pageGlyphIndices = new IntArray[pageCount];
for (int i = 0, n = pageGlyphIndices.length; i < n; i++)
pageGlyphIndices[i] = new IntArray();
}
tempGlyphCount = new int[pageCount];
}
/** Sets the position of the text, relative to the position when the cached text was created.
* @param x The x coordinate
* @param y The y coordinate */
public void setPosition (float x, float y) {
translate(x - this.x, y - this.y);
}
/** Sets the position of the text, relative to its current position.
* @param xAmount The amount in x to move the text
* @param yAmount The amount in y to move the text */
public void translate (float xAmount, float yAmount) {
if (xAmount == 0 && yAmount == 0) return;
if (integer) {
xAmount = Math.round(xAmount);
yAmount = Math.round(yAmount);
}
x += xAmount;
y += yAmount;
float[][] pageVertices = this.pageVertices;
for (int i = 0, n = pageVertices.length; i < n; i++) {
float[] vertices = pageVertices[i];
for (int ii = 0, nn = idx[i]; ii < nn; ii += 5) {
vertices[ii] += xAmount;
vertices[ii + 1] += yAmount;
}
}
}
/** Tints all text currently in the cache. Does not affect subsequently added text. */
public void tint (Color tint) {
float newTint = tint.toFloatBits();
if (currentTint == newTint) return;
currentTint = newTint;
int[] tempGlyphCount = this.tempGlyphCount;
for (int i = 0, n = tempGlyphCount.length; i < n; i++)
tempGlyphCount[i] = 0;
for (int i = 0, n = layouts.size; i < n; i++) {
GlyphLayout layout = layouts.get(i);
for (int ii = 0, nn = layout.runs.size; ii < nn; ii++) {
GlyphRun run = layout.runs.get(ii);
Array glyphs = run.glyphs;
float colorFloat = tempColor.set(run.color).mul(tint).toFloatBits();
for (int iii = 0, nnn = glyphs.size; iii < nnn; iii++) {
Glyph glyph = glyphs.get(iii);
int page = glyph.page;
int offset = tempGlyphCount[page] * 20 + 2;
tempGlyphCount[page]++;
float[] vertices = pageVertices[page];
for (int v = 0; v < 20; v += 5)
vertices[offset + v] = colorFloat;
}
}
}
}
/** Sets the alpha component of all text currently in the cache. Does not affect subsequently added text. */
public void setAlphas (float alpha) {
int alphaBits = ((int)(254 * alpha)) << 24;
float prev = 0, newColor = 0;
for (int j = 0, length = pageVertices.length; j < length; j++) {
float[] vertices = pageVertices[j];
for (int i = 2, n = idx[j]; i < n; i += 5) {
float c = vertices[i];
if (c == prev && i != 2) {
vertices[i] = newColor;
} else {
prev = c;
int rgba = NumberUtils.floatToIntColor(c);
rgba = (rgba & 0x00FFFFFF) | alphaBits;
newColor = NumberUtils.intToFloatColor(rgba);
vertices[i] = newColor;
}
}
}
}
/** Sets the color of all text currently in the cache. Does not affect subsequently added text. */
public void setColors (float color) {
for (int j = 0, length = pageVertices.length; j < length; j++) {
float[] vertices = pageVertices[j];
for (int i = 2, n = idx[j]; i < n; i += 5)
vertices[i] = color;
}
}
/** Sets the color of all text currently in the cache. Does not affect subsequently added text. */
public void setColors (Color tint) {
setColors(tint.toFloatBits());
}
/** Sets the color of all text currently in the cache. Does not affect subsequently added text. */
public void setColors (float r, float g, float b, float a) {
int intBits = ((int)(255 * a) << 24) | ((int)(255 * b) << 16) | ((int)(255 * g) << 8) | ((int)(255 * r));
setColors(NumberUtils.intToFloatColor(intBits));
}
/** Sets the color of the specified characters. This may only be called after {@link #setText(CharSequence, float, float)} and
* is reset every time setText is called. */
public void setColors (Color tint, int start, int end) {
setColors(tint.toFloatBits(), start, end);
}
/** Sets the color of the specified characters. This may only be called after {@link #setText(CharSequence, float, float)} and
* is reset every time setText is called. */
public void setColors (float color, int start, int end) {
if (pageVertices.length == 1) { // One page.
float[] vertices = pageVertices[0];
for (int i = start * 20 + 2, n = Math.min(end * 20, idx[0]); i < n; i += 5)
vertices[i] = color;
return;
}
int pageCount = pageVertices.length;
for (int i = 0; i < pageCount; i++) {
float[] vertices = pageVertices[i];
IntArray glyphIndices = pageGlyphIndices[i];
// Loop through the indices and determine whether the glyph is inside begin/end.
for (int j = 0, n = glyphIndices.size; j < n; j++) {
int glyphIndex = glyphIndices.items[j];
// Break early if the glyph is out of bounds.
if (glyphIndex >= end) break;
// If inside start and end, change its colour.
if (glyphIndex >= start) { // && glyphIndex < end
for (int off = 0; off < 20; off += 5)
vertices[off + (j * 20 + 2)] = color;
}
}
}
}
/** Returns the color used for subsequently added text. Modifying the color affects text subsequently added to the cache, but
* does not affect existing text currently in the cache. */
public Color getColor () {
return color;
}
/** A convenience method for setting the cache color. The color can also be set by modifying {@link #getColor()}. */
public void setColor (Color color) {
this.color.set(color);
}
/** A convenience method for setting the cache color. The color can also be set by modifying {@link #getColor()}. */
public void setColor (float r, float g, float b, float a) {
color.set(r, g, b, a);
}
public void draw (Batch spriteBatch) {
Array regions = font.getRegions();
for (int j = 0, n = pageVertices.length; j < n; j++) {
if (idx[j] > 0) { // ignore if this texture has no glyphs
float[] vertices = pageVertices[j];
spriteBatch.draw(regions.get(j).getTexture(), vertices, 0, idx[j]);
}
}
}
public void draw (Batch spriteBatch, int start, int end) {
if (pageVertices.length == 1) { // 1 page.
spriteBatch.draw(font.getRegion().getTexture(), pageVertices[0], start * 20, (end - start) * 20);
return;
}
// Determine vertex offset and count to render for each page. Some pages might not need to be rendered at all.
Array regions = font.getRegions();
for (int i = 0, pageCount = pageVertices.length; i < pageCount; i++) {
int offset = -1, count = 0;
// For each set of glyph indices, determine where to begin within the start/end bounds.
IntArray glyphIndices = pageGlyphIndices[i];
for (int ii = 0, n = glyphIndices.size; ii < n; ii++) {
int glyphIndex = glyphIndices.get(ii);
// Break early if the glyph is out of bounds.
if (glyphIndex >= end) break;
// Determine if this glyph is within bounds. Use the first match of that for the offset.
if (offset == -1 && glyphIndex >= start) offset = ii;
// Determine the vertex count by counting glyphs within bounds.
if (glyphIndex >= start) // && gInd < end
count++;
}
// Page doesn't need to be rendered.
if (offset == -1 || count == 0) continue;
// Render the page vertex data with the offset and count.
spriteBatch.draw(regions.get(i).getTexture(), pageVertices[i], offset * 20, count * 20);
}
}
public void draw (Batch spriteBatch, float alphaModulation) {
if (alphaModulation == 1) {
draw(spriteBatch);
return;
}
Color color = getColor();
float oldAlpha = color.a;
color.a *= alphaModulation;
setColors(color);
draw(spriteBatch);
color.a = oldAlpha;
setColors(color);
}
/** Removes all glyphs in the cache. */
public void clear () {
x = 0;
y = 0;
Pools.freeAll(pooledLayouts, true);
pooledLayouts.clear();
layouts.clear();
for (int i = 0, n = idx.length; i < n; i++) {
if (pageGlyphIndices != null) pageGlyphIndices[i].clear();
idx[i] = 0;
}
}
private void requireGlyphs (GlyphLayout layout) {
if (pageVertices.length == 1) {
// Simpler counting if we just have one page.
int newGlyphCount = 0;
for (int i = 0, n = layout.runs.size; i < n; i++)
newGlyphCount += layout.runs.get(i).glyphs.size;
requirePageGlyphs(0, newGlyphCount);
} else {
int[] tempGlyphCount = this.tempGlyphCount;
for (int i = 0, n = tempGlyphCount.length; i < n; i++)
tempGlyphCount[i] = 0;
// Determine # of glyphs in each page.
for (int i = 0, n = layout.runs.size; i < n; i++) {
Array glyphs = layout.runs.get(i).glyphs;
for (int ii = 0, nn = glyphs.size; ii < nn; ii++)
tempGlyphCount[glyphs.get(ii).page]++;
}
// Require that many for each page.
for (int i = 0, n = tempGlyphCount.length; i < n; i++)
requirePageGlyphs(i, tempGlyphCount[i]);
}
}
private void requirePageGlyphs (int page, int glyphCount) {
if (pageGlyphIndices != null) {
if (glyphCount > pageGlyphIndices[page].items.length)
pageGlyphIndices[page].ensureCapacity(glyphCount - pageGlyphIndices[page].size);
}
int vertexCount = idx[page] + glyphCount * 20;
float[] vertices = pageVertices[page];
if (vertices == null) {
pageVertices[page] = new float[vertexCount];
} else if (vertices.length < vertexCount) {
float[] newVertices = new float[vertexCount];
System.arraycopy(vertices, 0, newVertices, 0, idx[page]);
pageVertices[page] = newVertices;
}
}
private void addToCache (GlyphLayout layout, float x, float y) {
// Check if the number of font pages has changed.
int pageCount = font.regions.size;
if (pageVertices.length < pageCount) {
float[][] newPageVertices = new float[pageCount][];
System.arraycopy(pageVertices, 0, newPageVertices, 0, pageVertices.length);
pageVertices = newPageVertices;
int[] newIdx = new int[pageCount];
System.arraycopy(idx, 0, newIdx, 0, idx.length);
idx = newIdx;
IntArray[] newPageGlyphIndices = new IntArray[pageCount];
int pageGlyphIndicesLength = 0;
if (pageGlyphIndices != null) {
pageGlyphIndicesLength = pageGlyphIndices.length;
System.arraycopy(pageGlyphIndices, 0, newPageGlyphIndices, 0, pageGlyphIndices.length);
}
for (int i = pageGlyphIndicesLength; i < pageCount; i++)
newPageGlyphIndices[i] = new IntArray();
pageGlyphIndices = newPageGlyphIndices;
tempGlyphCount = new int[pageCount];
}
layouts.add(layout);
requireGlyphs(layout);
for (int i = 0, n = layout.runs.size; i < n; i++) {
GlyphRun run = layout.runs.get(i);
Array glyphs = run.glyphs;
FloatArray xAdvances = run.xAdvances;
float color = run.color.toFloatBits();
float gx = x + run.x, gy = y + run.y;
for (int ii = 0, nn = glyphs.size; ii < nn; ii++) {
Glyph glyph = glyphs.get(ii);
gx += xAdvances.get(ii);
addGlyph(glyph, gx, gy, color);
}
}
currentTint = Color.WHITE_FLOAT_BITS; // Cached glyphs have changed, reset the current tint.
}
private void addGlyph (Glyph glyph, float x, float y, float color) {
final float scaleX = font.data.scaleX, scaleY = font.data.scaleY;
x += glyph.xoffset * scaleX;
y += glyph.yoffset * scaleY;
float width = glyph.width * scaleX, height = glyph.height * scaleY;
final float u = glyph.u, u2 = glyph.u2, v = glyph.v, v2 = glyph.v2;
if (integer) {
x = Math.round(x);
y = Math.round(y);
width = Math.round(width);
height = Math.round(height);
}
final float x2 = x + width, y2 = y + height;
final int page = glyph.page;
int idx = this.idx[page];
this.idx[page] += 20;
if (pageGlyphIndices != null) pageGlyphIndices[page].add(glyphCount++);
final float[] vertices = pageVertices[page];
vertices[idx++] = x;
vertices[idx++] = y;
vertices[idx++] = color;
vertices[idx++] = u;
vertices[idx++] = v;
vertices[idx++] = x;
vertices[idx++] = y2;
vertices[idx++] = color;
vertices[idx++] = u;
vertices[idx++] = v2;
vertices[idx++] = x2;
vertices[idx++] = y2;
vertices[idx++] = color;
vertices[idx++] = u2;
vertices[idx++] = v2;
vertices[idx++] = x2;
vertices[idx++] = y;
vertices[idx++] = color;
vertices[idx++] = u2;
vertices[idx] = v;
}
/** Clears any cached glyphs and adds glyphs for the specified text.
* @see #addText(CharSequence, float, float, int, int, float, int, boolean, String) */
public GlyphLayout setText (CharSequence str, float x, float y) {
clear();
return addText(str, x, y, 0, str.length(), 0, Align.left, false);
}
/** Clears any cached glyphs and adds glyphs for the specified text.
* @see #addText(CharSequence, float, float, int, int, float, int, boolean, String) */
public GlyphLayout setText (CharSequence str, float x, float y, float targetWidth, int halign, boolean wrap) {
clear();
return addText(str, x, y, 0, str.length(), targetWidth, halign, wrap);
}
/** Clears any cached glyphs and adds glyphs for the specified text.
* @see #addText(CharSequence, float, float, int, int, float, int, boolean, String) */
public GlyphLayout setText (CharSequence str, float x, float y, int start, int end, float targetWidth, int halign,
boolean wrap) {
clear();
return addText(str, x, y, start, end, targetWidth, halign, wrap);
}
/** Clears any cached glyphs and adds glyphs for the specified text.
* @see #addText(CharSequence, float, float, int, int, float, int, boolean, String) */
public GlyphLayout setText (CharSequence str, float x, float y, int start, int end, float targetWidth, int halign,
boolean wrap, String truncate) {
clear();
return addText(str, x, y, start, end, targetWidth, halign, wrap, truncate);
}
/** Clears any cached glyphs and adds the specified glyphs.
* @see #addText(CharSequence, float, float, int, int, float, int, boolean, String) */
public void setText (GlyphLayout layout, float x, float y) {
clear();
addText(layout, x, y);
}
/** Adds glyphs for the specified text.
* @see #addText(CharSequence, float, float, int, int, float, int, boolean, String) */
public GlyphLayout addText (CharSequence str, float x, float y) {
return addText(str, x, y, 0, str.length(), 0, Align.left, false, null);
}
/** Adds glyphs for the specified text.
* @see #addText(CharSequence, float, float, int, int, float, int, boolean, String) */
public GlyphLayout addText (CharSequence str, float x, float y, float targetWidth, int halign, boolean wrap) {
return addText(str, x, y, 0, str.length(), targetWidth, halign, wrap, null);
}
/** Adds glyphs for the specified text.
* @see #addText(CharSequence, float, float, int, int, float, int, boolean, String) */
public GlyphLayout addText (CharSequence str, float x, float y, int start, int end, float targetWidth, int halign,
boolean wrap) {
return addText(str, x, y, start, end, targetWidth, halign, wrap, null);
}
/** Adds glyphs for the the specified text.
* @param x The x position for the left most character.
* @param y The y position for the top of most capital letters in the font (the {@link BitmapFontData#capHeight cap height}).
* @param start The first character of the string to draw.
* @param end The last character of the string to draw (exclusive).
* @param targetWidth The width of the area the text will be drawn, for wrapping or truncation.
* @param halign Horizontal alignment of the text, see {@link Align}.
* @param wrap If true, the text will be wrapped within targetWidth.
* @param truncate If not null, the text will be truncated within targetWidth with this string appended. May be an empty
* string.
* @return The glyph layout for the cached string (the layout's height is the distance from y to the baseline). */
public GlyphLayout addText (CharSequence str, float x, float y, int start, int end, float targetWidth, int halign,
boolean wrap, String truncate) {
GlyphLayout layout = Pools.obtain(GlyphLayout.class);
pooledLayouts.add(layout);
layout.setText(font, str, start, end, color, targetWidth, halign, wrap, truncate);
addText(layout, x, y);
return layout;
}
/** Adds the specified glyphs. */
public void addText (GlyphLayout layout, float x, float y) {
addToCache(layout, x, y + font.data.ascent);
}
/** Returns the x position of the cached string, relative to the position when the string was cached. */
public float getX () {
return x;
}
/** Returns the y position of the cached string, relative to the position when the string was cached. */
public float getY () {
return y;
}
public BitmapFont getFont () {
return font;
}
/** Specifies whether to use integer positions or not. Default is to use them so filtering doesn't kick in as badly.
* @param use */
public void setUseIntegerPositions (boolean use) {
this.integer = use;
}
/** @return whether this font uses integer positions for drawing. */
public boolean usesIntegerPositions () {
return integer;
}
public float[] getVertices () {
return getVertices(0);
}
public float[] getVertices (int page) {
return pageVertices[page];
}
public int getVertexCount (int page) {
return idx[page];
}
public Array getLayouts () {
return layouts;
}
}
