Implement radial and conical gradients for rgb64 rendering

Adds the last two missing source types to rgb64 rendering.
Conical and radial gradients. At the same time linear
gradients are moved to a template form to increase code
sharing.

Change-Id: I30fdd0837b0da03e3447683856ebbe4d7f48df6c
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>

1 files changed, 101 insertions, 91 deletions

diff --git a/src/gui/painting/qdrawhelper.cpp b/src/gui/painting/qdrawhelper.cpp
index aad904e8fc..138e1ecb3b 100644
--- a/src/gui/painting/qdrawhelper.cpp
+++ b/src/gui/painting/qdrawhelper.cpp
@@ -3441,78 +3441,50 @@ static void QT_FASTCALL getLinearGradientValues(LinearGradientValues *v, const Q
     }
 }
 
-static const uint * QT_FASTCALL qt_fetch_linear_gradient(uint *buffer, const Operator *op, const QSpanData *data,
-                                                         int y, int x, int length)
+class GradientBase32
 {
-    const uint *b = buffer;
-    qreal t, inc;
-
-    bool affine = true;
-    qreal rx=0, ry=0;
-    if (op->linear.l == 0) {
-        t = inc = 0;
-    } else {
-        rx = data->m21 * (y + qreal(0.5)) + data->m11 * (x + qreal(0.5)) + data->dx;
-        ry = data->m22 * (y + qreal(0.5)) + data->m12 * (x + qreal(0.5)) + data->dy;
-        t = op->linear.dx*rx + op->linear.dy*ry + op->linear.off;
-        inc = op->linear.dx * data->m11 + op->linear.dy * data->m12;
-        affine = !data->m13 && !data->m23;
-
-        if (affine) {
-            t *= (GRADIENT_STOPTABLE_SIZE - 1);
-            inc *= (GRADIENT_STOPTABLE_SIZE - 1);
-        }
+public:
+    typedef uint Type;
+    static Type null() { return 0; }
+    static Type fetchSingle(const QGradientData& gradient, qreal v)
+    {
+        return qt_gradient_pixel(&gradient, v);
     }
-
-    const uint *end = buffer + length;
-    if (affine) {
-        if (inc > qreal(-1e-5) && inc < qreal(1e-5)) {
-            QT_MEMFILL_UINT(buffer, length, qt_gradient_pixel_fixed(&data->gradient, int(t * FIXPT_SIZE)));
-        } else {
-            if (t+inc*length < qreal(INT_MAX >> (FIXPT_BITS + 1)) &&
-                t+inc*length > qreal(INT_MIN >> (FIXPT_BITS + 1))) {
-                // we can use fixed point math
-                int t_fixed = int(t * FIXPT_SIZE);
-                int inc_fixed = int(inc * FIXPT_SIZE);
-                while (buffer < end) {
-                    *buffer = qt_gradient_pixel_fixed(&data->gradient, t_fixed);
-                    t_fixed += inc_fixed;
-                    ++buffer;
-                }
-            } else {
-                // we have to fall back to float math
-                while (buffer < end) {
-                    *buffer = qt_gradient_pixel(&data->gradient, t/GRADIENT_STOPTABLE_SIZE);
-                    t += inc;
-                    ++buffer;
-                }
-            }
-        }
-    } else { // fall back to float math here as well
-        qreal rw = data->m23 * (y + qreal(0.5)) + data->m13 * (x + qreal(0.5)) + data->m33;
-        while (buffer < end) {
-            qreal x = rx/rw;
-            qreal y = ry/rw;
-            t = (op->linear.dx*x + op->linear.dy *y) + op->linear.off;
-
-            *buffer = qt_gradient_pixel(&data->gradient, t);
-            rx += data->m11;
-            ry += data->m12;
-            rw += data->m13;
-            if (!rw) {
-                rw += data->m13;
-            }
-            ++buffer;
-        }
+    static Type fetchSingle(const QGradientData& gradient, int v)
+    {
+        return qt_gradient_pixel_fixed(&gradient, v);
     }
+    static void memfill(Type *buffer, Type fill, int length)
+    {
+        qt_memfill32(buffer, fill, length);
+    }
+};
 
-    return b;
-}
+class GradientBase64
+{
+public:
+    typedef QRgba64 Type;
+    static Type null() { return QRgba64::fromRgba64(0); }
+    static Type fetchSingle(const QGradientData& gradient, qreal v)
+    {
+        return qt_gradient_pixel64(&gradient, v);
+    }
+    static Type fetchSingle(const QGradientData& gradient, int v)
+    {
+        return qt_gradient_pixel64_fixed(&gradient, v);
+    }
+    static void memfill(Type *buffer, Type fill, int length)
+    {
+        qt_memfill64((quint64*)buffer, fill, length);
+    }
+};
 
-static const QRgba64 * QT_FASTCALL qt_fetch_linear_gradient_rgb64(QRgba64 *buffer, const Operator *op, const QSpanData *data,
-                                                                 int y, int x, int length)
+template<class GradientBase, typename BlendType>
+static inline const BlendType * QT_FASTCALL qt_fetch_linear_gradient_template(
+        BlendType *buffer, const Operator *op, const QSpanData *data,
+        int y, int x, int length)
 {
-    const QRgba64 *b = buffer;
+    const BlendType *b = buffer;
     qreal t, inc;
 
     bool affine = true;
@@ -3532,11 +3504,10 @@ static const QRgba64 * QT_FASTCALL qt_fetch_linear_gradient_rgb64(QRgba64 *buffe
         }
     }
 
-    const QRgba64 *end = buffer + length;
+    const BlendType *end = buffer + length;
     if (affine) {
         if (inc > qreal(-1e-5) && inc < qreal(1e-5)) {
-            QRgba64 color = qt_gradient_pixel64_fixed(&data->gradient, int(t * FIXPT_SIZE));
-            qt_memfill64((quint64*)buffer, color, length);
+            GradientBase::memfill(buffer, GradientBase::fetchSingle(data->gradient, int(t * FIXPT_SIZE)), length);
         } else {
             if (t+inc*length < qreal(INT_MAX >> (FIXPT_BITS + 1)) &&
                 t+inc*length > qreal(INT_MIN >> (FIXPT_BITS + 1))) {
@@ -3544,14 +3515,14 @@ static const QRgba64 * QT_FASTCALL qt_fetch_linear_gradient_rgb64(QRgba64 *buffe
                 int t_fixed = int(t * FIXPT_SIZE);
                 int inc_fixed = int(inc * FIXPT_SIZE);
                 while (buffer < end) {
-                    *buffer = qt_gradient_pixel64_fixed(&data->gradient, t_fixed);
+                    *buffer = GradientBase::fetchSingle(data->gradient, t_fixed);
                     t_fixed += inc_fixed;
                     ++buffer;
                 }
             } else {
                 // we have to fall back to float math
                 while (buffer < end) {
-                    *buffer = qt_gradient_pixel64(&data->gradient, t/GRADIENT_STOPTABLE_SIZE);
+                    *buffer = GradientBase::fetchSingle(data->gradient, t/GRADIENT_STOPTABLE_SIZE);
                     t += inc;
                     ++buffer;
                 }
@@ -3564,7 +3535,7 @@ static const QRgba64 * QT_FASTCALL qt_fetch_linear_gradient_rgb64(QRgba64 *buffe
             qreal y = ry/rw;
             t = (op->linear.dx*x + op->linear.dy *y) + op->linear.off;
 
-            *buffer = qt_gradient_pixel64(&data->gradient, t);
+            *buffer = GradientBase::fetchSingle(data->gradient, t);
             rx += data->m11;
             ry += data->m12;
             rw += data->m13;
@@ -3578,6 +3549,18 @@ static const QRgba64 * QT_FASTCALL qt_fetch_linear_gradient_rgb64(QRgba64 *buffe
     return b;
 }
 
+static const uint * QT_FASTCALL qt_fetch_linear_gradient(uint *buffer, const Operator *op, const QSpanData *data,
+                                                         int y, int x, int length)
+{
+    return qt_fetch_linear_gradient_template<GradientBase32, uint>(buffer, op, data, y, x, length);
+}
+
+static const QRgba64 * QT_FASTCALL qt_fetch_linear_gradient_rgb64(QRgba64 *buffer, const Operator *op, const QSpanData *data,
+                                                                 int y, int x, int length)
+{
+    return qt_fetch_linear_gradient_template<GradientBase64, QRgba64>(buffer, op, data, y, x, length);
+}
+
 static void QT_FASTCALL getRadialGradientValues(RadialGradientValues *v, const QSpanData *data)
 {
     v->dx = data->gradient.radial.center.x - data->gradient.radial.focal.x;
@@ -3592,19 +3575,22 @@ static void QT_FASTCALL getRadialGradientValues(RadialGradientValues *v, const Q
     v->extended = !qFuzzyIsNull(data->gradient.radial.focal.radius) || v->a <= 0;
 }
 
-class RadialFetchPlain
+template <class GradientBase>
+class RadialFetchPlain : public GradientBase
 {
 public:
-    static inline void fetch(uint *buffer, uint *end, const Operator *op, const QSpanData *data, qreal det,
-                             qreal delta_det, qreal delta_delta_det, qreal b, qreal delta_b)
+    typedef typename GradientBase::Type BlendType;
+    static void fetch(BlendType *buffer, BlendType *end,
+                      const Operator *op, const QSpanData *data, qreal det,
+                      qreal delta_det, qreal delta_delta_det, qreal b, qreal delta_b)
     {
         if (op->radial.extended) {
             while (buffer < end) {
-                quint32 result = 0;
+                BlendType result = GradientBase::null();
                 if (det >= 0) {
                     qreal w = qSqrt(det) - b;
                     if (data->gradient.radial.focal.radius + op->radial.dr * w >= 0)
-                        result = qt_gradient_pixel(&data->gradient, w);
+                        result = GradientBase::fetchSingle(data->gradient, w);
                 }
 
                 *buffer = result;
@@ -3617,7 +3603,7 @@ public:
             }
         } else {
             while (buffer < end) {
-                *buffer++ = qt_gradient_pixel(&data->gradient, qSqrt(det) - b);
+                *buffer++ = GradientBase::fetchSingle(data->gradient, qSqrt(det) - b);
 
                 det += delta_det;
                 delta_det += delta_delta_det;
@@ -3630,15 +3616,23 @@ public:
 const uint * QT_FASTCALL qt_fetch_radial_gradient_plain(uint *buffer, const Operator *op, const QSpanData *data,
                                                         int y, int x, int length)
 {
-    return qt_fetch_radial_gradient_template<RadialFetchPlain>(buffer, op, data, y, x, length);
+    return qt_fetch_radial_gradient_template<RadialFetchPlain<GradientBase32>, uint>(buffer, op, data, y, x, length);
 }
 
 static SourceFetchProc qt_fetch_radial_gradient = qt_fetch_radial_gradient_plain;
 
-static const uint * QT_FASTCALL qt_fetch_conical_gradient(uint *buffer, const Operator *, const QSpanData *data,
-                                                          int y, int x, int length)
+const QRgba64 * QT_FASTCALL qt_fetch_radial_gradient_rgb64(QRgba64 *buffer, const Operator *op, const QSpanData *data,
+                                                        int y, int x, int length)
+{
+    return qt_fetch_radial_gradient_template<RadialFetchPlain<GradientBase64>, QRgba64>(buffer, op, data, y, x, length);
+}
+
+template <class GradientBase, typename BlendType>
+static inline const BlendType * QT_FASTCALL qt_fetch_conical_gradient_template(
+        BlendType *buffer, const QSpanData *data,
+        int y, int x, int length)
 {
-    const uint *b = buffer;
+    const BlendType *b = buffer;
     qreal rx = data->m21 * (y + qreal(0.5))
                + data->dx + data->m11 * (x + qreal(0.5));
     qreal ry = data->m22 * (y + qreal(0.5))
@@ -3647,14 +3641,14 @@ static const uint * QT_FASTCALL qt_fetch_conical_gradient(uint *buffer, const Op
 
     const qreal inv2pi = M_1_PI / 2.0;
 
-    const uint *end = buffer + length;
+    const BlendType *end = buffer + length;
     if (affine) {
         rx -= data->gradient.conical.center.x;
         ry -= data->gradient.conical.center.y;
         while (buffer < end) {
             qreal angle = qAtan2(ry, rx) + data->gradient.conical.angle;
 
-            *buffer = qt_gradient_pixel(&data->gradient, 1 - angle * inv2pi);
+            *buffer = GradientBase::fetchSingle(data->gradient, 1 - angle * inv2pi);
 
             rx += data->m11;
             ry += data->m12;
@@ -3670,7 +3664,7 @@ static const uint * QT_FASTCALL qt_fetch_conical_gradient(uint *buffer, const Op
                                 rx/rw - data->gradient.conical.center.y)
                           + data->gradient.conical.angle;
 
-            *buffer = qt_gradient_pixel(&data->gradient, 1 - angle * inv2pi);
+            *buffer = GradientBase::fetchSingle(data->gradient, 1 - angle * inv2pi);
 
             rx += data->m11;
             ry += data->m12;
@@ -3684,6 +3678,18 @@ static const uint * QT_FASTCALL qt_fetch_conical_gradient(uint *buffer, const Op
     return b;
 }
 
+static const uint * QT_FASTCALL qt_fetch_conical_gradient(uint *buffer, const Operator *, const QSpanData *data,
+                                                          int y, int x, int length)
+{
+    return qt_fetch_conical_gradient_template<GradientBase32, uint>(buffer, data, y, x, length);
+}
+
+static const QRgba64 * QT_FASTCALL qt_fetch_conical_gradient_rgb64(QRgba64 *buffer, const Operator *, const QSpanData *data,
+                                                                   int y, int x, int length)
+{
+    return qt_fetch_conical_gradient_template<GradientBase64, QRgba64>(buffer, data, y, x, length);
+}
+
 #    define PRELOAD_INIT(x)
 #    define PRELOAD_INIT2(x,y)
 #    define PRELOAD_COND(x)
@@ -5876,6 +5882,8 @@ static inline Operator getOperator(const QSpanData *data, const QSpan *spans, in
     switch(data->type) {
     case QSpanData::Solid:
         solidSource = data->solid.color.isOpaque();
+        op.srcFetch = 0;
+        op.srcFetch64 = 0;
         break;
     case QSpanData::LinearGradient:
         solidSource = !data->gradient.alphaColor;
@@ -5887,18 +5895,20 @@ static inline Operator getOperator(const QSpanData *data, const QSpan *spans, in
         solidSource = !data->gradient.alphaColor;
         getRadialGradientValues(&op.radial, data);
         op.srcFetch = qt_fetch_radial_gradient;
-        op.srcFetch64 = 0; //qt_fetch_radial_gradient_rgb64;
+        op.srcFetch64 = qt_fetch_radial_gradient_rgb64;
         break;
     case QSpanData::ConicalGradient:
         solidSource = !data->gradient.alphaColor;
         op.srcFetch = qt_fetch_conical_gradient;
-        op.srcFetch64 = 0; //qt_fetch_conical_gradient_rgb64;
+        op.srcFetch64 = qt_fetch_conical_gradient_rgb64;
         break;
     case QSpanData::Texture:
+        solidSource = !data->texture.hasAlpha;
         op.srcFetch = sourceFetch[getBlendType(data)][data->texture.format];
         op.srcFetch64 = sourceFetch64[getBlendType(data)][data->texture.format];
-        solidSource = !data->texture.hasAlpha;
+        break;
     default:
+        Q_UNREACHABLE();
         break;
     }
 
@@ -6212,7 +6222,7 @@ public:
 
     bool isSupported() const
     {
-        return op.srcFetch64 && op.func64 && op.destFetch64 && op.destStore64;
+        return op.func64 && op.destFetch64 && op.destStore64;
     }
 
     const QRgba64 *fetch(int x, int y, int len)
@@ -6303,7 +6313,7 @@ static void blend_untransformed_generic_rgb64(int count, const QSpan *spans, voi
     QSpanData *data = reinterpret_cast<QSpanData *>(userData);
 
     Operator op = getOperator(data, spans, count);
-    if (!op.srcFetch64 || !op.func64) {
+    if (!op.func64) {
         qWarning() << Q_FUNC_INFO << "Unsupported blend";
         return blend_untransformed_generic(count, spans, userData);
     }
@@ -6544,7 +6554,7 @@ static void blend_tiled_generic_rgb64(int count, const QSpan *spans, void *userD
     QSpanData *data = reinterpret_cast<QSpanData *>(userData);
 
     Operator op = getOperator(data, spans, count);
-    if (!op.srcFetch64 || !op.func64) {
+    if (!op.func64) {
         qDebug("unsupported rgb64 blend");
         return blend_tiled_generic(count, spans, userData);
     }