thirdparty/scummvm
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improved the alpha blending code, now works properly for nesting/redraw (changed meaning of WIDGET_CLEARBG a little bit for this)

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svn-id: r4509
This commit is contained in:
Max Horn 2002-07-10 16:49:45 +00:00
parent 5cc6e3f6a0
commit d32e3ad11f
5 changed files with 137 additions and 19 deletions
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44
gui/dialog.cpp
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@ -25,12 +25,52 @@
#include "widget.h"
#include "newgui.h"
Dialog::~Dialog()
{
teardownScreenBuf();
}
void Dialog::setupScreenBuf()
{
// Create _screenBuf if it doesn't already exist
if (!_screenBuf)
_screenBuf = new byte[320*200];
// Draw the fixed parts of the dialog: background and border.
_gui->blendArea(_x, _y, _w, _h, _gui->_bgcolor);
_gui->box(_x, _y, _w, _h);
// Draw a bgcolor rectangle for all widgets which have WIDGET_CLEARBG set.
Widget *w = _firstWidget;
while (w) {
if (w->_flags & WIDGET_CLEARBG)
_gui->fillArea(_x + w->_x, _y + w->_y, w->_w, w->_h, _gui->_bgcolor);
// FIXME - should we also draw borders here if WIDGET_BORDER is set?
w = w->_next;
}
// Finally blit this to _screenBuf
_gui->blitTo(_screenBuf, _x, _y, _w, _h);
}
void Dialog::teardownScreenBuf()
{
if (_screenBuf) {
delete [] _screenBuf;
_screenBuf = 0;
}
}
void Dialog::draw()
{
Widget *w = _firstWidget;
_gui->fillArea(_x, _y, _w, _h, _gui->_bgcolor);
_gui->box(_x, _y, _w, _h);
if (_screenBuf) {
_gui->blitFrom(_screenBuf, _x, _y, _w, _h);
} else {
_gui->fillArea(_x, _y, _w, _h, _gui->_bgcolor);
_gui->box(_x, _y, _w, _h);
}
_gui->setAreaDirty(_x, _y, _w, _h);
while (w) {