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Have Font::write return the width of the drawn text

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This avoids having to do separate getTextWidth calls in several places.

More getTextWidth calls could be saved by splitting the rendering of
the font to an off-screen buffer from the final composition onto the
destination surface: the routines that draw text inside a box have to
compute the width before they can draw the box and currently the box
has to be drawn before the text.
This commit is contained in:
Maarten ter Huurne 2014-08-15 03:32:32 +02:00
parent 6895ac0b54
commit ab7a4c1cf7
3 changed files with 35 additions and 24 deletions
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32
src/font.cpp
View File

@ -6,6 +6,7 @@
#include <SDL.h>
#include <SDL_ttf.h>
#include <algorithm>
#include <vector>
/* TODO: Let the theme choose the font and font size */
@ -197,38 +198,38 @@ int Font::getTextHeight(const string &text)
return nLines * getLineSpacing();
}
void Font::write(Surface& surface, const string &text,
int Font::write(Surface& surface, const string &text,
int x, int y, HAlign halign, VAlign valign)
{
if (!font) {
return;
return 0;
}
size_t pos = text.find('\n', 0);
if (pos == string::npos) {
writeLine(surface, text, x, y, halign, valign);
return writeLine(surface, text, x, y, halign, valign);
} else {
int maxWidth = 0;
size_t prev = 0;
do {
maxWidth = max(maxWidth,
writeLine(surface, text.substr(prev, pos - prev),
x, y, halign, valign);
x, y, halign, valign));
y += lineSpacing;
prev = pos + 1;
pos = text.find('\n', prev);
} while (pos != string::npos);
writeLine(surface, text.substr(prev), x, y, halign, valign);
return max(maxWidth,
writeLine(surface, text.substr(prev), x, y, halign, valign));
}
}
void Font::writeLine(Surface& surface, std::string const& text,
int Font::writeLine(Surface& surface, std::string const& text,
int x, int y, HAlign halign, VAlign valign)
{
if (!font) {
return;
}
if (text.empty()) {
// SDL_ttf will return a nullptr when rendering the empty string.
return;
return 0;
}
switch (valign) {
@ -246,17 +247,18 @@ void Font::writeLine(Surface& surface, std::string const& text,
SDL_Surface *s = TTF_RenderUTF8_Blended(font, text.c_str(), color);
if (!s) {
ERROR("Font rendering failed for text \"%s\"\n", text.c_str());
return;
return 0;
}
const int width = s->w;
switch (halign) {
case HAlignLeft:
break;
case HAlignCenter:
x -= s->w / 2;
x -= width / 2;
break;
case HAlignRight:
x -= s->w;
x -= width;
break;
}
@ -287,8 +289,10 @@ void Font::writeLine(Surface& surface, std::string const& text,
s = TTF_RenderUTF8_Blended(font, text.c_str(), color);
if (!s) {
ERROR("Font rendering failed for text \"%s\"\n", text.c_str());
return;
return width;
}
SDL_BlitSurface(s, NULL, surface.raw, &rect);
SDL_FreeSurface(s);
return width;
}

12
src/font.h
View File

@ -38,7 +38,11 @@ public:
return lineSpacing;
}
void write(Surface& surface,
/**
* Draws a text on a surface in this font.
* @return The width of the text in pixels.
*/
int write(Surface& surface,
const std::string &text, int x, int y,
HAlign halign = HAlignLeft, VAlign valign = VAlignTop);
@ -48,7 +52,11 @@ private:
std::string wordWrapSingleLine(const std::string &text,
size_t start, size_t end, int width);
void writeLine(Surface& surface, std::string const& text,
/**
* Draws a single line of text on a surface in this font.
* @return The width of the text in pixels.
*/
int writeLine(Surface& surface, std::string const& text,
int x, int y, HAlign halign, VAlign valign);
TTF_Font *font;

13
src/gmenu2x.cpp
View File

@ -321,10 +321,9 @@ void GMenu2X::initBG() {
if (sd) sd->blit(*bgmain, 3, bottomBarIconY);
}
string df = getDiskFree(getHome().c_str());
font->write(*bgmain, df, 22, bottomBarTextY, Font::HAlignLeft, Font::VAlignMiddle);
cpuX = 32 + font->write(*bgmain, getDiskFree(getHome().c_str()),
22, bottomBarTextY, Font::HAlignLeft, Font::VAlignMiddle);
cpuX = font->getTextWidth(df) + 32;
#ifdef ENABLE_CPUFREQ
{
auto cpu = OffscreenSurface::loadImage(
@ -1044,8 +1043,8 @@ int GMenu2X::drawButton(Surface& s, const string &btn, const string &text, int x
if (sc.skinRes("imgs/buttons/"+btn+".png") != NULL) {
sc["imgs/buttons/"+btn+".png"]->blit(s, x, y-7);
re.w = sc["imgs/buttons/"+btn+".png"]->width() + 3;
font->write(s, text, x+re.w, y, Font::HAlignLeft, Font::VAlignMiddle);
re.w += font->getTextWidth(text);
re.w += font->write(
s, text, x+re.w, y, Font::HAlignLeft, Font::VAlignMiddle);
}
return x+re.w+6;
}
@ -1056,8 +1055,8 @@ int GMenu2X::drawButtonRight(Surface& s, const string &btn, const string &text,
x -= 16;
sc["imgs/buttons/"+btn+".png"]->blit(s, x, y-7);
x -= 3;
font->write(s, text, x, y, Font::HAlignRight, Font::VAlignMiddle);
return x-6-font->getTextWidth(text);
return x-6 - font->write(
s, text, x, y, Font::HAlignRight, Font::VAlignMiddle);
}
return x-6;
}