thirdparty/scummvm
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Added Dirty Rect handling functionality

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svn-id: r43406
This commit is contained in:
Paul Gilbert 2009-08-15 11:50:59 +00:00
parent aae6c98945
commit 49a4df3c8c
9 changed files with 106 additions and 3 deletions
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72
engines/cruise/gfxModule.cpp
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@ -26,6 +26,8 @@
#include "common/system.h"
#include "common/endian.h"
#include "common/list.h"
#include "common/rect.h"
#include "cruise/cruise.h"
#include "cruise/cruise_main.h"
@ -41,6 +43,12 @@ palEntry lpalette[256];
int palDirtyMin = 256;
int palDirtyMax = -1;
typedef Common::List<Common::Rect> RectList;
RectList _dirtyRects;
RectList _priorFrameRects;
bool _dirtyRectScreen = false;
gfxModuleDataStruct gfxModuleData = {
0, // use Tandy
0, // use EGA
@ -229,7 +237,47 @@ void gfxModuleData_flipScreen(void) {
flip();
}
void gfxModuleData_addDirtyRect(const Common::Rect &r) {
_dirtyRects.push_back(Common::Rect( MAX(r.left, (int16)0), MAX(r.top, (int16)0),
MIN(r.right, (int16)320), MIN(r.bottom, (int16)200)));
}
/**
* Creates the union of two rectangles.
*/
static bool unionRectangle(Common::Rect &pDest, const Common::Rect &pSrc1, const Common::Rect &pSrc2) {
pDest.left = MIN(pSrc1.left, pSrc2.left);
pDest.top = MIN(pSrc1.top, pSrc2.top);
pDest.right = MAX(pSrc1.right, pSrc2.right);
pDest.bottom = MAX(pSrc1.bottom, pSrc2.bottom);
return !pDest.isEmpty();
}
static void mergeClipRects() {
RectList::iterator rOuter, rInner;
for (rOuter = _dirtyRects.begin(); rOuter != _dirtyRects.end(); ++rOuter) {
rInner = rOuter;
while (++rInner != _dirtyRects.end()) {
if ((*rOuter).intersects(*rInner)) {
// these two rectangles overlap, so translate it to a bigger rectangle
// that contains both of them
unionRectangle(*rOuter, *rOuter, *rInner);
// remove the inner rect from the list
_dirtyRects.erase(rInner);
// move back to beginning of list
rInner = rOuter;
}
}
}
}
void flip() {
RectList::iterator dr;
int i;
byte paletteRGBA[256 * 4];
@ -245,7 +293,29 @@ void flip() {
palDirtyMax = -1;
}
g_system->copyRectToScreen(globalScreen, 320, 0, 0, 320, 200);
// Make a copy of the prior frame's dirty rects, and then backup the current frame's rects
RectList tempList = _priorFrameRects;
_priorFrameRects = _dirtyRects;
// Merge the prior frame's dirty rects into the current frame's list
for (dr = tempList.begin(); dr != tempList.end(); ++dr) {
Common::Rect &r = *dr;
_dirtyRects.push_back(Common::Rect(r.left, r.top, r.right, r.bottom));
}
// Merge any overlapping rects to simplify the drawing process
mergeClipRects();
// Copy any modified areas
for (dr = _dirtyRects.begin(); dr != _dirtyRects.end(); ++dr) {
Common::Rect &r = *dr;
g_system->copyRectToScreen(globalScreen + 320 * r.top + r.left, 320,
r.left, r.top, r.width(), r.height());
}
_dirtyRects.clear();
// Allow the screen to update
g_system->updateScreen();
}