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Optimize GdiGradientFill by drawing lines instead of pixels.

This commit is contained in:
Mike McCormack 2004-03-31 19:58:25 +00:00 committed by Alexandre Julliard
parent 01fefd636e
commit 307ee761ef
1 changed files with 24 additions and 6 deletions
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30
dlls/gdi/painting.c
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@ -1093,7 +1093,7 @@ BOOL WINAPI GdiGradientFill( HDC hdc, TRIVERTEX *vert_array, ULONG nvert,
TRIVERTEX *v2 = vert_array + rect->LowerRight;
int y1 = v1->y < v2->y ? v1->y : v2->y;
int y2 = v2->y > v1->y ? v2->y : v1->y;
int x, y, dx;
int x, dx;
if (v1->x > v2->x)
{
TRIVERTEX *t = v2;
@ -1103,11 +1103,20 @@ BOOL WINAPI GdiGradientFill( HDC hdc, TRIVERTEX *vert_array, ULONG nvert,
dx = v2->x - v1->x;
for (x = 0; x < dx; x++)
{
for (y = y1; y < y2; y++)
SetPixel (hdc, x + v1->x, y, RGB(
POINT pts[2];
HPEN hPen, hOldPen;
hPen = CreatePen( PS_SOLID, 1, RGB(
(v1->Red * (dx - x) + v2->Red * x) / dx >> 8,
(v1->Green * (dx - x) + v2->Green * x) / dx >> 8,
(v1->Blue * (dx - x) + v2->Blue * x) / dx >> 8));
hOldPen = SelectObject( hdc, hPen );
pts[0].x = x;
pts[0].y = y1;
pts[1].x = x;
pts[1].y = y2;
Polyline( hdc, &pts[0], 2 );
DeleteObject( SelectObject(hdc, hOldPen ) );
}
}
break;
@ -1119,7 +1128,7 @@ BOOL WINAPI GdiGradientFill( HDC hdc, TRIVERTEX *vert_array, ULONG nvert,
TRIVERTEX *v2 = vert_array + rect->LowerRight;
int x1 = v1->x < v2->x ? v1->x : v2->x;
int x2 = v2->x > v1->x ? v2->x : v1->x;
int x, y, dy;
int y, dy;
if (v1->y > v2->y)
{
TRIVERTEX *t = v2;
@ -1129,11 +1138,20 @@ BOOL WINAPI GdiGradientFill( HDC hdc, TRIVERTEX *vert_array, ULONG nvert,
dy = v2->y - v1->y;
for (y = 0; y < dy; y++)
{
for (x = x1; x < x2; x++)
SetPixel (hdc, x, y + v1->y, RGB(
POINT pts[2];
HPEN hPen, hOldPen;
hPen = CreatePen( PS_SOLID, 1, RGB(
(v1->Red * (dy - y) + v2->Red * y) / dy >> 8,
(v1->Green * (dy - y) + v2->Green * y) / dy >> 8,
(v1->Blue * (dy - y) + v2->Blue * y) / dy >> 8));
hOldPen = SelectObject( hdc, hPen );
pts[0].x = x1;
pts[0].y = y;
pts[1].x = x2;
pts[1].y = y;
Polyline( hdc, &pts[0], 2 );
DeleteObject( SelectObject(hdc, hOldPen ) );
}
}
break;