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gdiplus: Improve performance of units_to_pixels by not using division.

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Single float division (divss) is at least four time slower,
than multiplication (mulss).
More information: https://www.agner.org/optimize/instruction_tables.pdf

The units_to_pixels was optimized to use only multiplication (mulss),
and avoid using divisions (divss).
This commit is contained in:
Bartosz Kosiorek 2023-10-24 22:12:21 +02:00 committed by Alexandre Julliard
parent 059094c1c1
commit 012f610675
1 changed files with 6 additions and 4 deletions
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10
dlls/gdiplus/gdiplus.c
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@ -36,7 +36,9 @@
WINE_DEFAULT_DEBUG_CHANNEL(gdiplus); WINE_DEFAULT_DEBUG_CHANNEL(gdiplus);
static const REAL mm_per_inch = 25.4; static const REAL mm_per_inch = 25.4;
static const REAL inch_per_mm = 1.0 / 25.4;
static const REAL point_per_inch = 72.0; static const REAL point_per_inch = 72.0;
static const REAL inch_per_point = 1.0 / 72.0;
static Status WINAPI NotificationHook(ULONG_PTR *token) static Status WINAPI NotificationHook(ULONG_PTR *token)
{ {
@ -333,17 +335,17 @@ REAL units_to_pixels(REAL units, GpUnit unit, REAL dpi, BOOL printer_display)
return units; return units;
case UnitDisplay: case UnitDisplay:
if (printer_display) if (printer_display)
return units * dpi / 100.0; return units * dpi * 0.01f;
else else
return units; return units;
case UnitPoint: case UnitPoint:
return units * dpi / point_per_inch; return units * dpi * inch_per_point;
case UnitInch: case UnitInch:
return units * dpi; return units * dpi;
case UnitDocument: case UnitDocument:
return units * dpi / 300.0; /* Per MSDN */ return units * dpi * (1.0f / 300.0f); /* Per MSDN */
case UnitMillimeter: case UnitMillimeter:
return units * dpi / mm_per_inch; return units * dpi * inch_per_mm;
default: default:
FIXME("Unhandled unit type: %d\n", unit); FIXME("Unhandled unit type: %d\n", unit);
return 0; return 0;