tibia-client/src/framework/graphics/font.cpp

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#include "font.h"
#include "texturemanager.h"
#include "graphics.h"
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#include <framework/otml/otml.h>
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void Font::load(const OTMLNodePtr& fontNode)
{
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std::string textureName = fontNode->readAt<std::string>("texture");
Size glyphSize = fontNode->readAt<Size>("glyph size");
m_glyphHeight = fontNode->readAt<int>("height");
m_topMargin = fontNode->readAt("top margin", 0);
m_firstGlyph = fontNode->readAt("first glyph", 32);
m_glyphSpacing = fontNode->readAt("spacing", Size(0,0));
// load font texture
m_texture = g_textures.getTexture(textureName);
if(!m_texture)
throw OTMLException(fontNode, "failed to load texture for font");
// auto calculate widths
calculateGlyphsWidthsAutomatically(glyphSize);
// read custom widths
if(OTMLNodePtr node = fontNode->get("glyph widths")) {
for(const OTMLNodePtr& child : node->childNodes())
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m_glyphsSize[fw::safe_cast<int>(child->tag())].setWidth(child->read<int>());
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}
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// calculate glyphs texture coords
int numHorizontalGlyphs = m_texture->getSize().width() / glyphSize.width();
for(int glyph = m_firstGlyph; glyph < 256; ++glyph) {
m_glyphsTextureCoords[glyph].setRect(((glyph - m_firstGlyph) % numHorizontalGlyphs) * glyphSize.width(),
((glyph - m_firstGlyph) / numHorizontalGlyphs) * glyphSize.height(),
m_glyphsSize[glyph].width(),
m_glyphHeight);
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}
}
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void Font::renderText(const std::string& text,
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const Point& startPos,
const Color& color)
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{
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Size boxSize = g_graphics.getScreenSize() - startPos.toSize();
Rect screenCoords(startPos, boxSize);
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renderText(text, screenCoords, AlignTopLeft, color);
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}
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void Font::renderText(const std::string& text,
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const Rect& screenCoords,
AlignmentFlag align,
const Color& color)
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{
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// prevent glitches from invalid rects
if(!screenCoords.isValid())
return;
int textLenght = text.length();
// map glyphs positions
Size textBoxSize;
const std::vector<Point>& glyphsPositions = calculateGlyphsPositions(text, align, &textBoxSize);
g_graphics.bindColor(color);
g_graphics.bindTexture(m_texture);
g_graphics.startDrawing();
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for(int i = 0; i < textLenght; ++i) {
int glyph = (uchar)text[i];
// skip invalid glyphs
if(glyph < 32)
continue;
// calculate initial glyph rect and texture coords
Rect glyphScreenCoords(glyphsPositions[i], m_glyphsSize[glyph]);
Rect glyphTextureCoords = m_glyphsTextureCoords[glyph];
// first translate to align position
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if(align & AlignBottom) {
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glyphScreenCoords.translate(0, screenCoords.height() - textBoxSize.height());
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} else if(align & AlignVerticalCenter) {
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glyphScreenCoords.translate(0, (screenCoords.height() - textBoxSize.height()) / 2);
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} else { // AlignTop
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// nothing to do
}
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if(align & AlignRight) {
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glyphScreenCoords.translate(screenCoords.width() - textBoxSize.width(), 0);
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} else if(align & AlignHorizontalCenter) {
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glyphScreenCoords.translate((screenCoords.width() - textBoxSize.width()) / 2, 0);
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} else { // AlignLeft
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// nothing to do
}
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// only render glyphs that are after 0, 0
if(glyphScreenCoords.bottom() < 0 || glyphScreenCoords.right() < 0)
continue;
// bound glyph topLeft to 0,0 if needed
if(glyphScreenCoords.top() < 0) {
glyphTextureCoords.setTop(glyphTextureCoords.top() - glyphScreenCoords.top());
glyphScreenCoords.setTop(0);
}
if(glyphScreenCoords.left() < 0) {
glyphTextureCoords.setLeft(glyphTextureCoords.left() - glyphScreenCoords.left());
glyphScreenCoords.setLeft(0);
}
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// translate rect to screen coords
glyphScreenCoords.translate(screenCoords.topLeft());
// only render if glyph rect is visible on screenCoords
if(!screenCoords.intersects(glyphScreenCoords))
continue;
// bound glyph bottomRight to screenCoords bottomRight
if(glyphScreenCoords.bottom() > screenCoords.bottom()) {
glyphTextureCoords.setBottom(glyphTextureCoords.bottom() + (screenCoords.bottom() - glyphScreenCoords.bottom()));
glyphScreenCoords.setBottom(screenCoords.bottom());
}
if(glyphScreenCoords.right() > screenCoords.right()) {
glyphTextureCoords.setRight(glyphTextureCoords.right() + (screenCoords.right() - glyphScreenCoords.right()));
glyphScreenCoords.setRight(screenCoords.right());
}
// render glyph
g_graphics.drawTexturedRect(glyphScreenCoords, m_texture, glyphTextureCoords);
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}
g_graphics.stopDrawing();
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}
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const std::vector<Point>& Font::calculateGlyphsPositions(const std::string& text,
AlignmentFlag align,
Size *textBoxSize) const
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{
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// for performance reasons we use statics vectors that are allocated on demand
static std::vector<Point> glyphsPositions(1);
static std::vector<int> lineWidths(1);
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int textLength = text.length();
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int maxLineWidth = 0;
int lines = 0;
int glyph;
int i;
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// return if there is no text
if(textLength == 0) {
if(textBoxSize)
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textBoxSize->setSize(0,m_glyphHeight);
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return glyphsPositions;
}
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// resize glyphsPositions vector when needed
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if(textLength > (int)glyphsPositions.size())
glyphsPositions.resize(textLength);
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// calculate lines width
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if((align & AlignRight || align & AlignHorizontalCenter) || textBoxSize) {
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lineWidths[0] = 0;
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for(i = 0; i< textLength; ++i) {
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glyph = (uchar)text[i];
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if(glyph == (uchar)'\n') {
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lines++;
if(lines+1 > (int)lineWidths.size())
lineWidths.resize(lines+1);
lineWidths[lines] = 0;
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} else if(glyph >= 32) {
lineWidths[lines] += m_glyphsSize[glyph].width();
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maxLineWidth = std::max(maxLineWidth, lineWidths[lines]);
}
}
}
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Point virtualPos(0, m_topMargin);
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lines = 0;
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for(i = 0; i < textLength; ++i) {
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glyph = (uchar)text[i];
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// new line or first glyph
if(glyph == (uchar)'\n' || i == 0) {
if(glyph == (uchar)'\n') {
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virtualPos.y += m_glyphHeight + m_glyphSpacing.height();
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lines++;
}
// calculate start x pos
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if(align & AlignRight) {
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virtualPos.x = (maxLineWidth - lineWidths[lines]);
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} else if(align & AlignHorizontalCenter) {
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virtualPos.x = (maxLineWidth - lineWidths[lines]) / 2;
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} else { // AlignLeft
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virtualPos.x = 0;
}
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}
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// store current glyph topLeft
glyphsPositions[i] = virtualPos;
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// render only if the glyph is valid
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if(glyph >= 32 && glyph != (uchar)'\n') {
virtualPos.x += m_glyphsSize[glyph].width();
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}
}
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if(textBoxSize) {
textBoxSize->setWidth(maxLineWidth);
textBoxSize->setHeight(virtualPos.y + m_glyphHeight);
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}
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return glyphsPositions;
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}
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Size Font::calculateTextRectSize(const std::string& text)
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{
Size size;
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calculateGlyphsPositions(text, AlignTopLeft, &size);
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return size;
}
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void Font::calculateGlyphsWidthsAutomatically(const Size& glyphSize)
{
int numHorizontalGlyphs = m_texture->getSize().width() / glyphSize.width();
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auto texturePixels = m_texture->getPixels();
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// small AI to auto calculate pixels widths
for(int glyph = m_firstGlyph; glyph< 256; ++glyph) {
Rect glyphCoords(((glyph - m_firstGlyph) % numHorizontalGlyphs) * glyphSize.width(),
((glyph - m_firstGlyph) / numHorizontalGlyphs) * glyphSize.height(),
glyphSize.width(),
m_glyphHeight);
int width = glyphSize.width();
int lastColumnFilledPixels = 0;
for(int x = glyphCoords.left() + 1; x <= glyphCoords.right(); ++x) {
int columnFilledPixels = 0;
// check if all vertical pixels are alpha
for(int y = glyphCoords.top(); y <= glyphCoords.bottom(); ++y) {
if(texturePixels[(y * m_texture->getSize().width() * 4) + (x*4) + 3] != 0)
columnFilledPixels++;
}
// if all pixels were alpha we found the width
if(columnFilledPixels == 0) {
width = x - glyphCoords.left();
width += m_glyphSpacing.width();
if(m_glyphHeight >= 16 && lastColumnFilledPixels >= m_glyphHeight/3)
width += 1;
break;
}
lastColumnFilledPixels = columnFilledPixels;
}
// store glyph size
m_glyphsSize[glyph].setSize(width, m_glyphHeight);
}
}