qdrawhelper_p.h

奇趣公司比较新的qt/emd版本

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#ifndef QDRAWHELPER_P_H
#define QDRAWHELPER_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "QtCore/qglobal.h"
#include "QtGui/qcolor.h"
#include "QtGui/qpainter.h"
#include "QtGui/qimage.h"
#ifndef QT_FT_BEGIN_HEADER
#define QT_FT_BEGIN_HEADER
#define QT_FT_END_HEADER
#endif
#include "private/qrasterdefs_p.h"

#ifdef Q_WS_QWS
#include "QtGui/qscreen_qws.h"
#define Q_GUI_QWS_EXPORT Q_GUI_EXPORT
#else
#define Q_GUI_QWS_EXPORT
#endif

#define QT_ROTATION_CACHEDREAD 1
#define QT_ROTATION_CACHEDWRITE 2
#define QT_ROTATION_PACKING 3
#define QT_ROTATION_TILED 4

#ifndef QT_ROTATION_ALGORITHM
#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
#define QT_ROTATION_ALGORITHM QT_ROTATION_TILED
#else
#define QT_ROTATION_ALGORITHM QT_ROTATION_CACHEDREAD
#endif
#endif

/*******************************************************************************
 * QSpan
 *
 * duplicate definition of FT_Span
 */
typedef QT_FT_Span QSpan;

struct SolidData;
struct TextureData;
struct GradientData;
struct LinearGradientData;
struct RadialGradientData;
struct ConicalGradientData;
struct QSpanData;
class QGradient;
class QRasterBuffer;

typedef QT_FT_SpanFunc ProcessSpans;
typedef void (*BitmapBlitFunc)(QRasterBuffer *rasterBuffer,
                               int x, int y, quint32 color,
                               const uchar *bitmap,
                               int mapWidth, int mapHeight, int mapStride);
typedef void (*AlphamapBlitFunc)(QRasterBuffer *rasterBuffer,
                                 int x, int y, quint32 color,
                                 const uchar *bitmap,
                                 int mapWidth, int mapHeight, int mapStride);
typedef void (*RectFillFunc)(QRasterBuffer *rasterBuffer,
                             int x, int y, int width, int height,
                             quint32 color);

struct DrawHelper {
    ProcessSpans blendColor;
    ProcessSpans blendGradient;
    BitmapBlitFunc bitmapBlit;
    AlphamapBlitFunc alphamapBlit;
    RectFillFunc fillRect;
};

extern DrawHelper qDrawHelper[QImage::NImageFormats];
void qBlendTexture(int count, const QSpan *spans, void *userData);
#ifdef Q_WS_QWS
extern DrawHelper qDrawHelperCallback[QImage::NImageFormats];
void qBlendTextureCallback(int count, const QSpan *spans, void *userData);
#endif

typedef void QT_FASTCALL (*CompositionFunction)(uint *dest, const uint *src, int length, uint const_alpha);
typedef void QT_FASTCALL (*CompositionFunctionSolid)(uint *dest, int length, uint color, uint const_alpha);

void qInitDrawhelperAsm();

class QRasterPaintEngine;

struct SolidData
{
    uint color;
};

struct LinearGradientData
{
    struct {
        qreal x;
        qreal y;
    } origin;
    struct {
        qreal x;
        qreal y;
    } end;
};

struct RadialGradientData
{
    struct {
        qreal x;
        qreal y;
    } center;
    struct {
        qreal x;
        qreal y;
    } focal;
    qreal radius;
};

struct ConicalGradientData
{
    struct {
        qreal x;
        qreal y;
    } center;
    qreal angle;
};

struct GradientData
{
    QGradient::Spread spread;

    union {
        LinearGradientData linear;
        RadialGradientData radial;
        ConicalGradientData conical;
    };

    // need to keep track of these as the same gradient might be used for several objects
    union {
        LinearGradientData unresolvedLinear;
        RadialGradientData unresolvedRadial;
        ConicalGradientData unresolvedConical;
    };

#ifdef Q_WS_QWS
#define GRADIENT_STOPTABLE_SIZE 256
#else
#define GRADIENT_STOPTABLE_SIZE 1024
#endif

    uint* colorTable; //[GRADIENT_STOPTABLE_SIZE];

    uint alphaColor : 1;
    uint needsResolving : 1;
};

struct TextureData
{
    const uchar *imageData;
    const uchar *scanLine(int y) const { return imageData + y*bytesPerLine; }
    int width;
    int height;
    int bytesPerLine;
    QImage::Format format;
    const QVector<QRgb> *colorTable;
    bool hasAlpha;
    enum Type {
        Plain,
        Tiled
    };
    Type type;
    int const_alpha;
};

struct QSpanData
{
    QRasterBuffer *rasterBuffer;
#ifdef Q_WS_QWS
    QRasterPaintEngine *rasterEngine;
#endif
    ProcessSpans blend;
    ProcessSpans unclipped_blend;
    BitmapBlitFunc bitmapBlit;
    AlphamapBlitFunc alphamapBlit;
    RectFillFunc fillRect;
    qreal m11, m12, m13, m21, m22, m23, dx, dy;   // inverse xform matrix
    enum Type {
        None,
        Solid,
        LinearGradient,
        RadialGradient,
        ConicalGradient,
        Texture
    } type : 8;
    int txop : 8;
    bool bilinear;
    QImage tempImage;
    union {
        SolidData solid;
        GradientData gradient;
        TextureData texture;
    };
    void init(QRasterBuffer *rb, QRasterPaintEngine *pe = 0);
    void setup(const QBrush &brush, int alpha);
    void setupMatrix(const QTransform &matrix, int bilinear);
    void initTexture(const QImage *image, int alpha, TextureData::Type = TextureData::Plain);
    void adjustSpanMethods();
};

template <class DST, class SRC>
inline DST qt_colorConvert(SRC color, DST dummy)
{
    Q_UNUSED(dummy);
    return color;
}


template <>
inline quint32 qt_colorConvert(quint16 color, quint32 dummy)
{
    Q_UNUSED(dummy);
    const int r = (color & 0xf800);
    const int g = (color & 0x07e0);
    const int b = (color & 0x001f);
    const int tr = (r >> 8) | (r >> 13);
    const int tg = (g >> 3) | (g >> 9);
    const int tb = (b << 3) | (b >> 2);

    return qRgb(tr, tg, tb);
}

template <>
inline quint16 qt_colorConvert(quint32 color, quint16 dummy)
{
    Q_UNUSED(dummy);
    const int r = qRed(color) << 8;
    const int g = qGreen(color) << 3;
    const int b = qBlue(color) >> 3;

    return (r & 0xf800) | (g & 0x07e0)| (b & 0x001f);
}

#ifdef QT_QWS_DEPTH_8
template <>
inline quint8 qt_colorConvert(quint32 color, quint8 dummy)
{
    Q_UNUSED(dummy);

    uchar r = ((qRed(color) & 0xf8) + 0x19) / 0x33;
    uchar g = ((qGreen(color) &0xf8) + 0x19) / 0x33;
    uchar b = ((qBlue(color) &0xf8) + 0x19) / 0x33;

    return r*6*6 + g*6 + b;
}

template <>
inline quint8 qt_colorConvert(quint16 color, quint8 dummy)
{
    Q_UNUSED(dummy);

    uchar r = (color & 0xf800) >> (11-3);
    uchar g = (color & 0x07c0) >> (6-3);
    uchar b = (color & 0x001f) << 3;

    uchar tr = (r + 0x19) / 0x33;
    uchar tg = (g + 0x19) / 0x33;
    uchar tb = (b + 0x19) / 0x33;

    return tr*6*6 + tg*6 + tb;
}
#endif // QT_QWS_DEPTH_8

#ifdef QT_QWS_DEPTH_24

// hw: endianess??
class quint24
{
public:
    inline quint24(quint32 v)
    {
        data[0] = qBlue(v);
        data[1] = qGreen(v);
        data[2] = qRed(v);
    }

    inline operator quint32 ()
    {
        return qRgb(data[2], data[1], data[0]);
    }

private:
    uchar data[3];
} Q_PACKED;

template <>
inline quint24 qt_colorConvert(quint32 color, quint24 dummy)
{
    Q_UNUSED(dummy);
    return quint24(color);
}

#endif // QT_QWS_DEPTH_24

#ifdef QT_QWS_DEPTH_18

// hw: endianess??
class quint18
{
public:
    inline quint18(quint32 v)
    {
        uchar b = qBlue(v);
        uchar g = qGreen(v);
        uchar r = qRed(v);
        uint p = (b >> 2) | ((g >> 2) << 6) | ((r >> 2) << 12);
        data[0] = qBlue(p);
        data[1] = qGreen(p);
        data[2] = qRed(p);
    }

    inline operator quint32 ()
    {
        const uchar r = (data[2] << 6) | ((data[1] & 0xf0) >> 2) | (data[2] & 0x3);
        const uchar g = (data[1] << 4) | ((data[0] & 0xc0) >> 4) | ((data[1] & 0x0f) >> 2);
        const uchar b = (data[0] << 2) | ((data[0] & 0x3f) >> 4);
        return qRgb(r, g, b);
    }

private:
    uchar data[3];
} Q_PACKED;

template <>
inline quint18 qt_colorConvert(quint32 color, quint18 dummy)
{
    Q_UNUSED(dummy);
    return quint18(color);
}

#endif // QT_QWS_DEPTH_18

#ifdef QT_QWS_DEPTH_GENERIC

struct qrgb
{
public:
    static int bpp;