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added surface boundary check

This commit is contained in:
thrust26 2019-04-06 12:11:03 +02:00
parent b62a33607c
commit 0d1848dcda
2 changed files with 44 additions and 1 deletions
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35
src/emucore/FBSurface.cxx
View File

@ -62,6 +62,7 @@ void FBSurface::readPixels(uInt8* buffer, uInt32 pitch, const GUI::Rect& rect) c
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void FBSurface::pixel(uInt32 x, uInt32 y, ColorId color)
{
// Note: checkbounds() must be done in calling method
uInt32* buffer = myPixels + y * myPitch + x;
*buffer = uInt32(myPalette[color]);
@ -70,6 +71,9 @@ void FBSurface::pixel(uInt32 x, uInt32 y, ColorId color)
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void FBSurface::line(uInt32 x, uInt32 y, uInt32 x2, uInt32 y2, ColorId color)
{
if(!checkBounds(x, y) || !checkBounds(x2, y2))
return;
// draw line using Bresenham algorithm
Int32 dx = (x2 - x);
Int32 dy = (y2 - y);
@ -129,6 +133,9 @@ void FBSurface::line(uInt32 x, uInt32 y, uInt32 x2, uInt32 y2, ColorId color)
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void FBSurface::hLine(uInt32 x, uInt32 y, uInt32 x2, ColorId color)
{
if(!checkBounds(x, y) || !checkBounds(x2, 2))
return;
uInt32* buffer = myPixels + y * myPitch + x;
while(x++ <= x2)
*buffer++ = uInt32(myPalette[color]);
@ -137,6 +144,9 @@ void FBSurface::hLine(uInt32 x, uInt32 y, uInt32 x2, ColorId color)
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void FBSurface::vLine(uInt32 x, uInt32 y, uInt32 y2, ColorId color)
{
if(!checkBounds(x, y) || !checkBounds(x, y2))
return;
uInt32* buffer = static_cast<uInt32*>(myPixels + y * myPitch + x);
while(y++ <= y2)
{
@ -190,8 +200,14 @@ void FBSurface::drawChar(const GUI::Font& font, uInt8 chr,
bby = desc.bbx[chr].y;
}
int cx = tx + bbx;
int cy = ty + desc.ascent - bby - bbh;
if(!checkBounds(cx , cy) || !checkBounds(cx + bbw - 1, cy + bbh - 1))
return;
const uInt16* tmp = desc.bits + (desc.offset ? desc.offset[chr] : (chr * desc.fbbh));
uInt32* buffer = myPixels + (ty + desc.ascent - bby - bbh) * myPitch + tx + bbx;
uInt32* buffer = myPixels + cy * myPitch + cx;
for(int y = 0; y < bbh; y++)
{
@ -217,6 +233,9 @@ void FBSurface::drawBitmap(uInt32* bitmap, uInt32 tx, uInt32 ty,
void FBSurface::drawBitmap(uInt32* bitmap, uInt32 tx, uInt32 ty,
ColorId color, uInt32 w, uInt32 h)
{
if(!checkBounds(tx, ty) || !checkBounds(tx + w - 1, ty + h - 1))
return;
uInt32* buffer = myPixels + ty * myPitch + tx;
for(uInt32 y = 0; y < h; ++y)
@ -233,6 +252,9 @@ void FBSurface::drawBitmap(uInt32* bitmap, uInt32 tx, uInt32 ty,
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void FBSurface::drawPixels(uInt32* data, uInt32 tx, uInt32 ty, uInt32 numpixels)
{
if(!checkBounds(tx, ty) || !checkBounds(tx + numpixels - 1, ty))
return;
uInt32* buffer = myPixels + ty * myPitch + tx;
for(uInt32 i = 0; i < numpixels; ++i)
@ -338,5 +360,16 @@ void FBSurface::drawString(const GUI::Font& font, const string& s,
}
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
bool FBSurface::checkBounds(const int x, const int y) const
{
if (x >= 0 && x <= (int)width() && y >= 0 && y <= (int)height())
return true;
cerr << "FBSurface::checkBounds() failed: "
<< x << ", " << y << " vs " << width() << ", " << height() << endl;
return false;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
const uInt32* FBSurface::myPalette = nullptr;

10
src/emucore/FBSurface.hxx
View File

@ -219,6 +219,16 @@ class FBSurface
ColorId color, TextAlign align = TextAlign::Left,
int deltax = 0, bool useEllipsis = true, ColorId shadowColor = kNone);
/**
This method should be called to check if the given coordinates are in
bounds of the surface.
@param x The x coordinate to check
@param y The y coordinate to check
@return True if coordinates are in bounds
*/
virtual bool checkBounds(const int x, const int y) const;
//////////////////////////////////////////////////////////////////////////
// Note: The following methods are FBSurface-specific, and must be
// implemented in child classes.