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New code for interpolate32_1_1 overflowed in 565 mode, so reverting to the old code (with some variable name changes to match the other interpolators)

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svn-id: r36086
This commit is contained in:
Max Horn 2009-01-27 00:55:28 +00:00
parent 8e447d1ee9
commit 153b32391f
1 changed files with 10 additions and 11 deletions
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21
graphics/scaler/intern.h
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@ -41,23 +41,22 @@
/**
* Interpolate two 16 bit pixel *pairs* at once with equal weights 1.
* In particular, p1 and p2 can contain two pixels each in the upper
* and lower halves. Requires only 5 operations!
* See <http://www.slack.net/~ant/info/rgb_mixing.html> for details on how this works.
* and lower halves.
*/
template<int bitFormat>
static inline uint32 interpolate32_1_1(uint32 p1, uint32 p2) {
return (p1 + p2 - ((p1 ^ p2) & kLowBitsMask)) >> 1;
return (((p1 & kHighBitsMask) >> 1) + ((p2 & kHighBitsMask) >> 1) + (p1 & p2 & kLowBitsMask));
}
/**
* Interpolate two 16 bit pixel *pairs* at once with weights 3 resp. 1.
* In particular, A and B can contain two pixels/each in the upper
* In particular, p1 and p2 can contain two pixels/each in the upper
* and lower halves.
*/
template<int bitFormat>
static inline uint32 interpolate32_3_1(uint32 A, uint32 B) {
register uint32 x = ((A & qhighBits) >> 2) * 3 + ((B & qhighBits) >> 2);
register uint32 y = ((A & qlowBits) * 3 + (B & qlowBits)) >> 2;
static inline uint32 interpolate32_3_1(uint32 p1, uint32 p2) {
register uint32 x = ((p1 & qhighBits) >> 2) * 3 + ((p2 & qhighBits) >> 2);
register uint32 y = ((p1 & qlowBits) * 3 + (p2 & qlowBits)) >> 2;
y &= qlowBits;
return x + y;
@ -65,13 +64,13 @@ static inline uint32 interpolate32_3_1(uint32 A, uint32 B) {
/**
* Interpolate four 16 bit pixel pairs at once with equal weights 1.
* In particular, A and B can contain two pixels/each in the upper
* In particular, p1, p2, p3 and p3 can each contain two pixels in the upper
* and lower halves.
*/
template<int bitFormat>
static inline uint32 interpolate32_1_1_1_1(uint32 A, uint32 B, uint32 C, uint32 D) {
register uint32 x = ((A & qhighBits) >> 2) + ((B & qhighBits) >> 2) + ((C & qhighBits) >> 2) + ((D & qhighBits) >> 2);
register uint32 y = ((A & qlowBits) + (B & qlowBits) + (C & qlowBits) + (D & qlowBits)) >> 2;
static inline uint32 interpolate32_1_1_1_1(uint32 p1, uint32 p2, uint32 p3, uint32 p4) {
register uint32 x = ((p1 & qhighBits) >> 2) + ((p2 & qhighBits) >> 2) + ((p3 & qhighBits) >> 2) + ((p4 & qhighBits) >> 2);
register uint32 y = ((p1 & qlowBits) + (p2 & qlowBits) + (p3 & qlowBits) + (p4 & qlowBits)) >> 2;
y &= qlowBits;
return x + y;