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comparison src/video/SDL_blit_A.c @ 2735:204be4fc2726

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Final merge of Google Summer of Code 2008 work... Port SDL 1.3 to the Nintendo DS by Darren Alton, mentored by Sam Lantinga
author Sam Lantinga <slouken@libsdl.org>
date Wed, 27 Aug 2008 15:10:03 +0000
parents dc3dd3a0bf02
children 6258fa7cd300
comparison
equal deleted inserted replaced
2734:dd25eabe441c 2735:204be4fc2726
281 mm_zero = _mm_setzero_si64(); /* 0 -> mm_zero */ 281 mm_zero = _mm_setzero_si64(); /* 0 -> mm_zero */
282 /* form the alpha mult */ 282 /* form the alpha mult */
283 amult = alpha | (alpha << 8); 283 amult = alpha | (alpha << 8);
284 amult = amult | (amult << 16); 284 amult = amult | (amult << 16);
285 chanmask = 285 chanmask =
286 (0xff << df->Rshift) | (0xff << df->Gshift) | (0xff << df-> 286 (0xff << df->Rshift) | (0xff << df->
287 Bshift); 287 Gshift) | (0xff << df->Bshift);
288 mm_alpha = _mm_set_pi32(0, amult & chanmask); /* 0000AAAA -> mm_alpha, minus 1 chan */ 288 mm_alpha = _mm_set_pi32(0, amult & chanmask); /* 0000AAAA -> mm_alpha, minus 1 chan */
289 mm_alpha = _mm_unpacklo_pi8(mm_alpha, mm_zero); /* 0A0A0A0A -> mm_alpha, minus 1 chan */ 289 mm_alpha = _mm_unpacklo_pi8(mm_alpha, mm_zero); /* 0A0A0A0A -> mm_alpha, minus 1 chan */
290 /* at this point mm_alpha can be 000A0A0A or 0A0A0A00 or another combo */ 290 /* at this point mm_alpha can be 000A0A0A or 0A0A0A00 or another combo */
291 dsta = _mm_set_pi32(dalpha, dalpha); /* dst alpha mask -> dsta */ 291 dsta = _mm_set_pi32(dalpha, dalpha); /* dst alpha mask -> dsta */
292 292
524 Uint32 bmask = RESHIFT(srcfmt->Bshift) << (dstfmt->Bshift); 524 Uint32 bmask = RESHIFT(srcfmt->Bshift) << (dstfmt->Bshift);
525 Uint32 amask; 525 Uint32 amask;
526 /* Use zero for alpha if either surface doesn't have alpha */ 526 /* Use zero for alpha if either surface doesn't have alpha */
527 if (dstfmt->Amask) { 527 if (dstfmt->Amask) {
528 amask = 528 amask =
529 ((srcfmt->Amask) ? RESHIFT(srcfmt->Ashift) : 0x10) << (dstfmt-> 529 ((srcfmt->Amask) ? RESHIFT(srcfmt->
530 Ashift); 530 Ashift) : 0x10) << (dstfmt->Ashift);
531 } else { 531 } else {
532 amask = 532 amask =
533 0x10101010 & ((dstfmt->Rmask | dstfmt->Gmask | dstfmt->Bmask) ^ 533 0x10101010 & ((dstfmt->Rmask | dstfmt->Gmask | dstfmt->Bmask) ^
534 0xFFFFFFFF); 534 0xFFFFFFFF);
535 } 535 }