Introduces a crash on start-up regression for several apps (designer, etc) on MinGW. Reverted for the alpha.

Revert "Implement the blend functions with SSE2"

This reverts commit f25099f400e7379f0a6e00500e990948b9785e63.

3 files changed, 13 insertions, 262 deletions

diff --git a/src/gui/painting/qdrawhelper.cpp b/src/gui/painting/qdrawhelper.cpp
index 891f4c211c..eca7a3991e 100644
--- a/src/gui/painting/qdrawhelper.cpp
+++ b/src/gui/painting/qdrawhelper.cpp
@@ -7897,43 +7897,20 @@ void qInitDrawhelperAsm()
             qDrawHelper[QImage::Format_ARGB32_Premultiplied].blendColor = qt_blend_color_argb_sse3dnow;
         }
 #endif // 3DNOW
+        extern void qt_blend_rgb32_on_rgb32_sse(uchar *destPixels, int dbpl,
+                                                const uchar *srcPixels, int sbpl,
+                                                int w, int h,
+                                                int const_alpha);
+        extern void qt_blend_argb32_on_argb32_sse(uchar *destPixels, int dbpl,
+                                                  const uchar *srcPixels, int sbpl,
+                                                  int w, int h,
+                                                  int const_alpha);
 
-
-#ifdef QT_HAVE_SSE2
-        if (features & SSE2) {
-            extern void qt_blend_rgb32_on_rgb32_sse2(uchar *destPixels, int dbpl,
-                                                     const uchar *srcPixels, int sbpl,
-                                                     int w, int h,
-                                                     int const_alpha);
-            extern void qt_blend_argb32_on_argb32_sse2(uchar *destPixels, int dbpl,
-                                                       const uchar *srcPixels, int sbpl,
-                                                       int w, int h,
-                                                       int const_alpha);
-
-
-            qBlendFunctions[QImage::Format_RGB32][QImage::Format_RGB32] = qt_blend_rgb32_on_rgb32_sse2;
-            qBlendFunctions[QImage::Format_ARGB32_Premultiplied][QImage::Format_RGB32] = qt_blend_rgb32_on_rgb32_sse2;
-            qBlendFunctions[QImage::Format_RGB32][QImage::Format_ARGB32_Premultiplied] = qt_blend_argb32_on_argb32_sse2;
-            qBlendFunctions[QImage::Format_ARGB32_Premultiplied][QImage::Format_ARGB32_Premultiplied] = qt_blend_argb32_on_argb32_sse2;
-        } else
-#endif
-        {
-            extern void qt_blend_rgb32_on_rgb32_sse(uchar *destPixels, int dbpl,
-                                                    const uchar *srcPixels, int sbpl,
-                                                    int w, int h,
-                                                    int const_alpha);
-            extern void qt_blend_argb32_on_argb32_sse(uchar *destPixels, int dbpl,
-                                                      const uchar *srcPixels, int sbpl,
-                                                      int w, int h,
-                                                      int const_alpha);
-
-
-            qBlendFunctions[QImage::Format_RGB32][QImage::Format_RGB32] = qt_blend_rgb32_on_rgb32_sse;
-            qBlendFunctions[QImage::Format_ARGB32_Premultiplied][QImage::Format_RGB32] = qt_blend_rgb32_on_rgb32_sse;
-            qBlendFunctions[QImage::Format_RGB32][QImage::Format_ARGB32_Premultiplied] = qt_blend_argb32_on_argb32_sse;
-            qBlendFunctions[QImage::Format_ARGB32_Premultiplied][QImage::Format_ARGB32_Premultiplied] = qt_blend_argb32_on_argb32_sse;
-        }
-}
+        qBlendFunctions[QImage::Format_RGB32][QImage::Format_RGB32] = qt_blend_rgb32_on_rgb32_sse;
+        qBlendFunctions[QImage::Format_ARGB32_Premultiplied][QImage::Format_RGB32] = qt_blend_rgb32_on_rgb32_sse;
+        qBlendFunctions[QImage::Format_RGB32][QImage::Format_ARGB32_Premultiplied] = qt_blend_argb32_on_argb32_sse;
+        qBlendFunctions[QImage::Format_ARGB32_Premultiplied][QImage::Format_ARGB32_Premultiplied] = qt_blend_argb32_on_argb32_sse;
+    }
 #endif // SSE
 
 #ifdef QT_HAVE_IWMMXT
diff --git a/src/gui/painting/qdrawhelper_sse2.cpp b/src/gui/painting/qdrawhelper_sse2.cpp
index 1dba91402f..dd6fa1badd 100644
--- a/src/gui/painting/qdrawhelper_sse2.cpp
+++ b/src/gui/painting/qdrawhelper_sse2.cpp
@@ -57,224 +57,6 @@
 
 QT_BEGIN_NAMESPACE
 
-/*
- * Multiply the components of pixelVector by alphaChannel
- * Each 32bits components of alphaChannel must be in the form 0x00AA00AA
- * colorMask must have 0x00ff00ff on each 32 bits component
- * half must have the value 128 (0x80) for each 32 bits compnent
- */
-Q_STATIC_INLINE_FUNCTION __m128i BYTE_MUL_SSE2(const __m128i pixelVector, const __m128i alphaChannel, const __m128i colorMask, const __m128i half)
-{
-    // 1. separate the colors in 2 vectors so each color is on 16 bits
-    // (in order to be multiplied by the alpha
-    // each 32 bit of dstVectorAG are in the form 0x00AA00GG
-    // each 32 bit of dstVectorRB are in the form 0x00RR00BB
-    __m128i pixelVectorAG = _mm_srli_epi16(pixelVector, 8);
-    __m128i pixelVectorRB = _mm_and_si128(pixelVector, colorMask);
-
-    // 2. multiply the vectors by the alpha channel
-    pixelVectorAG = _mm_mullo_epi16(pixelVectorAG, alphaChannel);
-    pixelVectorRB = _mm_mullo_epi16(pixelVectorRB, alphaChannel);
-
-    // 3. devide by 255, that's the tricky part.
-    // we do it like for BYTE_MUL(), with bit shift: X/255 ~= (X + X/256 + rounding)/256
-    /// so first (X + X/256 + rounding)
-    pixelVectorRB = _mm_add_epi16(pixelVectorRB, _mm_srli_epi16(pixelVectorRB, 8));
-    pixelVectorRB = _mm_add_epi16(pixelVectorRB, half);
-    pixelVectorAG = _mm_add_epi16(pixelVectorAG, _mm_srli_epi16(pixelVectorAG, 8));
-    pixelVectorAG = _mm_add_epi16(pixelVectorAG, half);
-
-    /// second devide by 256
-    pixelVectorRB = _mm_srli_epi16(pixelVectorRB, 8);
-    /// for AG, we could >> 8 to divide followed by << 8 to put the
-    /// bytes in the correct position. By masking instead, we execute
-    /// only one instruction
-    pixelVectorAG = _mm_andnot_si128(colorMask, pixelVectorAG);
-
-    // 4. combine the 2 pairs of colors
-    return _mm_or_si128(pixelVectorAG, pixelVectorRB);
-}
-
-/*
- * Each 32bits components of alphaChannel must be in the form 0x00AA00AA
- * oneMinusAlphaChannel must be 255 - alpha for each 32 bits component
- * colorMask must have 0x00ff00ff on each 32 bits component
- * half must have the value 128 (0x80) for each 32 bits compnent
- */
-Q_STATIC_INLINE_FUNCTION __m128i INTERPOLATE_PIXEL_255_SSE2(const __m128i srcVector,
-                                                            const __m128i dstVector,
-                                                            const __m128i alphaChannel,
-                                                            const __m128i oneMinusAlphaChannel ,
-                                                            const __m128i colorMask,
-                                                            const __m128i half) {
-    // interpolate AG
-    __m128i srcVectorAG = _mm_srli_epi16(srcVector, 8);
-    __m128i dstVectorAG = _mm_srli_epi16(dstVector, 8);
-    __m128i srcVectorAGalpha = _mm_mullo_epi16(srcVectorAG, alphaChannel);
-    __m128i dstVectorAGoneMinusAlphalpha = _mm_mullo_epi16(dstVectorAG, oneMinusAlphaChannel);
-    __m128i finalAG = _mm_add_epi16(srcVectorAGalpha, dstVectorAGoneMinusAlphalpha);
-    finalAG = _mm_add_epi16(finalAG, _mm_srli_epi16(finalAG, 8));
-    finalAG = _mm_add_epi16(finalAG, half);
-    finalAG = _mm_andnot_si128(colorMask, finalAG);
-
-    // interpolate RB
-    __m128i srcVectorRB = _mm_and_si128(srcVector, colorMask);
-    __m128i dstVectorRB = _mm_and_si128(dstVector, colorMask);
-    __m128i srcVectorRBalpha = _mm_mullo_epi16(srcVectorRB, alphaChannel);
-    __m128i dstVectorRBoneMinusAlphalpha = _mm_mullo_epi16(dstVectorRB, oneMinusAlphaChannel);
-    __m128i finalRB = _mm_add_epi16(srcVectorRBalpha, dstVectorRBoneMinusAlphalpha);
-    finalRB = _mm_add_epi16(finalRB, _mm_srli_epi16(finalRB, 8));
-    finalRB = _mm_add_epi16(finalRB, half);
-    finalRB = _mm_srli_epi16(finalRB, 8);
-
-    // combine
-    return _mm_or_si128(finalAG, finalRB);
-}
-
-void qt_blend_argb32_on_argb32_sse2(uchar *destPixels, int dbpl,
-                                    const uchar *srcPixels, int sbpl,
-                                    int w, int h,
-                                    int const_alpha)
-{
-    const quint32 *src = (const quint32 *) srcPixels;
-    quint32 *dst = (uint *) destPixels;
-    if (const_alpha == 256) {
-        const __m128i alphaMask = _mm_set1_epi32(0xff000000);
-        const __m128i nullVector = _mm_set1_epi32(0);
-        const __m128i half = _mm_set1_epi16(0x80);
-        const __m128i one = _mm_set1_epi16(0xff);
-        const __m128i colorMask = _mm_set1_epi32(0x00ff00ff);
-        for (int y = 0; y < h; ++y) {
-            int x = 0;
-            for (; x < w-3; x += 4) {
-                const __m128i srcVector = _mm_loadu_si128((__m128i *)&src[x]);
-                const __m128i srcVectorAlpha = _mm_and_si128(srcVector, alphaMask);
-                if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVectorAlpha, alphaMask)) == 0xffff) {
-                    // all opaque
-                    _mm_storeu_si128((__m128i *)&dst[x], srcVector);
-                } else if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVectorAlpha, nullVector)) != 0xffff) {
-                    // not fully transparent
-                    // result = s + d * (1-alpha)
-
-                    // extract the alpha channel on 2 x 16 bits
-                    // so we have room for the multiplication
-                    // each 32 bits will be in the form 0x00AA00AA
-                    // with A being the 1 - alpha
-                    __m128i alphaChannel = _mm_srli_epi32(srcVector, 24);
-                    alphaChannel = _mm_or_si128(alphaChannel, _mm_slli_epi32(alphaChannel, 16));
-                    alphaChannel = _mm_sub_epi16(one, alphaChannel);
-
-                    const __m128i dstVector = _mm_loadu_si128((__m128i *)&dst[x]);
-                    const __m128i destMultipliedByOneMinusAlpha = BYTE_MUL_SSE2(dstVector, alphaChannel, colorMask, half);
-
-                    // result = s + d * (1-alpha)
-                    const __m128i result = _mm_add_epi8(srcVector, destMultipliedByOneMinusAlpha);
-                    _mm_storeu_si128((__m128i *)&dst[x], result);
-                }
-            }
-            for (; x<w; ++x) {
-                uint s = src[x];
-                if (s >= 0xff000000)
-                    dst[x] = s;
-                else if (s != 0)
-                    dst[x] = s + BYTE_MUL(dst[x], qAlpha(~s));
-            }
-            dst = (quint32 *)(((uchar *) dst) + dbpl);
-            src = (const quint32 *)(((const uchar *) src) + sbpl);
-        }
-    } else if (const_alpha != 0) {
-        // dest = (s + d * sia) * ca + d * cia
-        //      = s * ca + d * (sia * ca + cia)
-        //      = s * ca + d * (1 - sa*ca)
-        const_alpha = (const_alpha * 255) >> 8;
-        const __m128i nullVector = _mm_set1_epi32(0);
-        const __m128i half = _mm_set1_epi16(0x80);
-        const __m128i one = _mm_set1_epi16(0xff);
-        const __m128i colorMask = _mm_set1_epi32(0x00ff00ff);
-        const __m128i constAlphaVector = _mm_set1_epi16(const_alpha);
-        for (int y = 0; y < h; ++y) {
-            int x = 0;
-            for (; x < w-3; x += 4) {
-                __m128i srcVector = _mm_loadu_si128((__m128i *)&src[x]);
-                if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVector, nullVector)) != 0xffff) {
-                    srcVector = BYTE_MUL_SSE2(srcVector, constAlphaVector, colorMask, half);
-
-                    __m128i alphaChannel = _mm_srli_epi32(srcVector, 24);
-                    alphaChannel = _mm_or_si128(alphaChannel, _mm_slli_epi32(alphaChannel, 16));
-                    alphaChannel = _mm_sub_epi16(one, alphaChannel);
-
-                    const __m128i dstVector = _mm_loadu_si128((__m128i *)&dst[x]);
-                    const __m128i destMultipliedByOneMinusAlpha = BYTE_MUL_SSE2(dstVector, alphaChannel, colorMask, half);
-
-                    const __m128i result = _mm_add_epi8(srcVector, destMultipliedByOneMinusAlpha);
-                    _mm_storeu_si128((__m128i *)&dst[x], result);
-                }
-            }
-            for (; x<w; ++x) {
-                quint32 s = src[x];
-                if (s != 0) {
-                    s = BYTE_MUL(s, const_alpha);
-                    dst[x] = s + BYTE_MUL(dst[x], qAlpha(~s));
-                }
-            }
-            dst = (quint32 *)(((uchar *) dst) + dbpl);
-            src = (const quint32 *)(((const uchar *) src) + sbpl);
-        }
-    }
-}
-
-// qblendfunctions.cpp
-void qt_blend_rgb32_on_rgb32(uchar *destPixels, int dbpl,
-                             const uchar *srcPixels, int sbpl,
-                             int w, int h,
-                             int const_alpha);
-
-void qt_blend_rgb32_on_rgb32_sse2(uchar *destPixels, int dbpl,
-                                 const uchar *srcPixels, int sbpl,
-                                 int w, int h,
-                                 int const_alpha)
-{
-    const quint32 *src = (const quint32 *) srcPixels;
-    quint32 *dst = (uint *) destPixels;
-    if (const_alpha != 256) {
-        if (const_alpha != 0) {
-            const __m128i nullVector = _mm_set1_epi32(0);
-            const __m128i half = _mm_set1_epi16(0x80);
-            const __m128i colorMask = _mm_set1_epi32(0x00ff00ff);
-
-            const_alpha = (const_alpha * 255) >> 8;
-            int one_minus_const_alpha = 255 - const_alpha;
-            const __m128i constAlphaVector = _mm_set1_epi16(const_alpha);
-            const __m128i oneMinusConstAlpha =  _mm_set1_epi16(one_minus_const_alpha);
-            for (int y = 0; y < h; ++y) {
-                int x = 0;
-                for (; x < w-3; x += 4) {
-                    __m128i srcVector = _mm_loadu_si128((__m128i *)&src[x]);
-                    if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVector, nullVector)) != 0xffff) {
-                        const __m128i dstVector = _mm_loadu_si128((__m128i *)&dst[x]);
-                        const __m128i result = INTERPOLATE_PIXEL_255_SSE2(srcVector,
-                                                                          dstVector,
-                                                                          constAlphaVector,
-                                                                          oneMinusConstAlpha,
-                                                                          colorMask,
-                                                                          half);
-                        _mm_storeu_si128((__m128i *)&dst[x], result);
-                    }
-                }
-                for (; x<w; ++x) {
-                    quint32 s = src[x];
-                    s = BYTE_MUL(s, const_alpha);
-                    dst[x] = INTERPOLATE_PIXEL_255(src[x], const_alpha, dst[x], one_minus_const_alpha);
-                }
-                dst = (quint32 *)(((uchar *) dst) + dbpl);
-                src = (const quint32 *)(((const uchar *) src) + sbpl);
-            }
-        }
-    } else {
-        qt_blend_rgb32_on_rgb32(destPixels, dbpl, srcPixels, sbpl, w, h, const_alpha);
-    }
-}
-
 void qt_memfill32_sse2(quint32 *dest, quint32 value, int count)
 {
     if (count < 7) {
diff --git a/src/gui/painting/qdrawhelper_x86_p.h b/src/gui/painting/qdrawhelper_x86_p.h
index d7282a7fc3..30aadd03bc 100644
--- a/src/gui/painting/qdrawhelper_x86_p.h
+++ b/src/gui/painting/qdrawhelper_x86_p.h
@@ -114,14 +114,6 @@ void qt_bitmapblit32_sse2(QRasterBuffer *rasterBuffer, int x, int y,
 void qt_bitmapblit16_sse2(QRasterBuffer *rasterBuffer, int x, int y,
                           quint32 color,
                           const uchar *src, int width, int height, int stride);
-void qt_blend_argb32_on_argb32_sse2(uchar *destPixels, int dbpl,
-                                    const uchar *srcPixels, int sbpl,
-                                    int w, int h,
-                                    int const_alpha);
-void qt_blend_rgb32_on_rgb32_sse2(uchar *destPixels, int dbpl,
-                                 const uchar *srcPixels, int sbpl,
-                                 int w, int h,
-                                 int const_alpha);
 #endif // QT_HAVE_SSE2
 
 #ifdef QT_HAVE_IWMMXT