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lightning-sunbird  0.9+nobinonly
Functions
ictrap.c File Reference
#include "icint.h"

Go to the source code of this file.

Functions

pixman_image_t * FbCreateAlphaPicture (pixman_image_t *dst, pixman_format_t *format, uint16_t width, uint16_t height)
static pixman_fixed16_16_t pixman_line_fixed_x (const pixman_line_fixed_t *l, pixman_fixed16_16_t y, int ceil)
static void pixman_trapezoid_bounds (int ntrap, const pixman_trapezoid_t *traps, pixman_box16_t *box)
void pixman_composite_trapezoids (pixman_operator_t op, pixman_image_t *src, pixman_image_t *dst, int xSrc, int ySrc, const pixman_trapezoid_t *traps, int ntraps)
void pixman_add_trapezoids (pixman_image_t *dst, int x_off, int y_off, const pixman_trapezoid_t *traps, int ntraps)

Function Documentation

pixman_image_t* FbCreateAlphaPicture ( pixman_image_t *  dst,
pixman_format_t *  format,
uint16_t  width,
uint16_t  height 
)

Definition at line 28 of file ictrap.c.

{
    pixman_image_t   *image;
    int own_format = 0;

    if (width > 32767 || height > 32767)
       return NULL;

    if (!format)
    {
       own_format = 1;
       if (dst->polyEdge == PolyEdgeSharp)
           format = pixman_format_create (PIXMAN_FORMAT_NAME_A1);
       else
           format = pixman_format_create (PIXMAN_FORMAT_NAME_A8);
       if (!format)
           return NULL;
    }

    image = pixman_image_create (format, width, height); 

    if (own_format)
       pixman_format_destroy (format);

    /* XXX: Is this a reasonable way to clear the image? Would
       probably be preferable to use pixman_image_fill_rectangle once such a
       beast exists. */
    memset (image->pixels->data, 0, height * image->pixels->stride);

    return image;
}

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void pixman_add_trapezoids ( pixman_image_t *  dst,
int  x_off,
int  y_off,
const pixman_trapezoid_t traps,
int  ntraps 
)

Definition at line 199 of file ictrap.c.

{
    for (; ntraps; ntraps--, traps++)
    {
       if (!xTrapezoidValid (traps))
           continue;

       fbRasterizeTrapezoid (dst, traps, x_off, y_off);
    }
}

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void pixman_composite_trapezoids ( pixman_operator_t  op,
pixman_image_t *  src,
pixman_image_t *  dst,
int  xSrc,
int  ySrc,
const pixman_trapezoid_t traps,
int  ntraps 
)

Definition at line 111 of file ictrap.c.

{
    pixman_image_t   *image = NULL;
    pixman_box16_t   traps_bounds, dst_bounds, bounds;
    pixman_region16_t       *traps_region, *dst_region;
    int16_t          xDst, yDst;
    int16_t          xRel, yRel;
    pixman_format_t  *format;

    if (ntraps == 0)
       return;

    /*
     * Check for solid alpha add
     */
    if (op == PIXMAN_OPERATOR_ADD && miIsSolidAlpha (src))
    {
       for (; ntraps; ntraps--, traps++)
           fbRasterizeTrapezoid (dst, traps, 0, 0);
       return;
    }

    xDst = traps[0].left.p1.x >> 16;
    yDst = traps[0].left.p1.y >> 16;
    
    pixman_trapezoid_bounds (ntraps, traps, &traps_bounds);

    traps_region = pixman_region_create_simple (&traps_bounds);

    /* XXX: If the image has a clip region set, we should really be
     * fetching it here instead, but it looks like we don't yet expose
     * a pixman_image_get_clip_region function. */
    dst_bounds.x1 = 0;
    dst_bounds.y1 = 0;
    dst_bounds.x2 = pixman_image_get_width (dst);
    dst_bounds.y2 = pixman_image_get_height (dst);

    dst_region = pixman_region_create_simple (&dst_bounds);

    pixman_region_intersect (traps_region, traps_region, dst_region);

    bounds = *(pixman_region_extents (traps_region));

    pixman_region_destroy (traps_region);
    pixman_region_destroy (dst_region);

    if (bounds.y1 >= bounds.y2 || bounds.x1 >= bounds.x2)
       return;

    format = pixman_format_create (PIXMAN_FORMAT_NAME_A8);
    if (!format)
       return;

    image = FbCreateAlphaPicture (dst, format,
                              bounds.x2 - bounds.x1,
                              bounds.y2 - bounds.y1);
    if (!image)
    {
       pixman_format_destroy (format);
       return;
    }

    for (; ntraps; ntraps--, traps++)
    {
       if (!xTrapezoidValid(traps))
           continue;
       fbRasterizeTrapezoid (image, traps, 
                           -bounds.x1, -bounds.y1);
    }

    xRel = bounds.x1 + xSrc - xDst;
    yRel = bounds.y1 + ySrc - yDst;
    pixman_composite (op, src, image, dst,
                    xRel, yRel, 0, 0, bounds.x1, bounds.y1,
                    bounds.x2 - bounds.x1,
                    bounds.y2 - bounds.y1);
    pixman_image_destroy (image);

    pixman_format_destroy (format);
}

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Definition at line 64 of file ictrap.c.

{
    pixman_fixed16_16_t    dx = l->p2.x - l->p1.x;
    xFixed_32_32    ex = (xFixed_32_32) (y - l->p1.y) * dx;
    pixman_fixed16_16_t    dy = l->p2.y - l->p1.y;
    if (ceil)
       ex += (dy - 1);
    return l->p1.x + (pixman_fixed16_16_t) (ex / dy);
}

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static void pixman_trapezoid_bounds ( int  ntrap,
const pixman_trapezoid_t traps,
pixman_box16_t box 
) [static]

Definition at line 75 of file ictrap.c.

{
    box->y1 = MAXSHORT;
    box->y2 = MINSHORT;
    box->x1 = MAXSHORT;
    box->x2 = MINSHORT;
    for (; ntrap; ntrap--, traps++)
    {
       int16_t x1, y1, x2, y2;

       if (!xTrapezoidValid(traps))
           continue;
       y1 = xFixedToInt (traps->top);
       if (y1 < box->y1)
           box->y1 = y1;
       
       y2 = xFixedToInt (xFixedCeil (traps->bottom));
       if (y2 > box->y2)
           box->y2 = y2;
       
       x1 = xFixedToInt (MIN (pixman_line_fixed_x (&traps->left, traps->top, 0),
                            pixman_line_fixed_x (&traps->left, traps->bottom, 0)));
       if (x1 < box->x1)
           box->x1 = x1;
       
       x2 = xFixedToInt (xFixedCeil (MAX (pixman_line_fixed_x (&traps->right, traps->top, 1),
                                      pixman_line_fixed_x (&traps->right, traps->bottom, 1))));
       if (x2 > box->x2)
           box->x2 = x2;
    }
}

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