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libart-lgpl/art_render.c

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/*
* art_render.c: Modular rendering architecture.
*
* Libart_LGPL - library of basic graphic primitives
* Copyright (C) 2000 Raph Levien
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "art_render.h"
#include "art_rgb.h"
typedef struct _ArtRenderPriv ArtRenderPriv;
struct _ArtRenderPriv {
ArtRender super;
ArtImageSource *image_source;
int n_mask_source;
ArtMaskSource **mask_source;
int n_callbacks;
ArtRenderCallback **callbacks;
};
ArtRender *
art_render_new (int x0, int y0, int x1, int y1,
art_u8 *pixels, int rowstride,
int n_chan, int depth, ArtAlphaType alpha_type,
ArtAlphaGamma *alphagamma)
{
ArtRenderPriv *priv;
ArtRender *result;
priv = art_new (ArtRenderPriv, 1);
result = &priv->super;
if (n_chan > ART_MAX_CHAN)
{
art_warn ("art_render_new: n_chan = %d, exceeds %d max\n",
n_chan, ART_MAX_CHAN);
return NULL;
}
if (depth > ART_MAX_DEPTH)
{
art_warn ("art_render_new: depth = %d, exceeds %d max\n",
depth, ART_MAX_DEPTH);
return NULL;
}
if (x0 >= x1)
{
art_warn ("art_render_new: x0 >= x1 (x0 = %d, x1 = %d)\n", x0, x1);
return NULL;
}
result->x0 = x0;
result->y0 = y0;
result->x1 = x1;
result->y1 = y1;
result->pixels = pixels;
result->rowstride = rowstride;
result->n_chan = n_chan;
result->depth = depth;
result->alpha_type = alpha_type;
result->clear = ART_FALSE;
result->opacity = 0x10000;
result->compositing_mode = ART_COMPOSITE_NORMAL;
result->alphagamma = alphagamma;
result->alpha_buf = NULL;
result->image_buf = NULL;
result->run = NULL;
result->span_x = NULL;
result->need_span = ART_FALSE;
priv->image_source = NULL;
priv->n_mask_source = 0;
priv->mask_source = NULL;
return result;
}
/* todo on clear routines: I haven't really figured out what to do
with clearing the alpha channel. It _should_ be possible to clear
to an arbitrary RGBA color. */
/**
* art_render_clear: Set clear color.
* @clear_color: Color with which to clear dest.
*
* Sets clear color, equivalent to actually clearing the destination
* buffer before rendering. This is the most general form.
**/
void
art_render_clear (ArtRender *render, const ArtPixMaxDepth *clear_color)
{
int i;
int n_ch = render->n_chan + (render->alpha_type != ART_ALPHA_NONE);
render->clear = ART_TRUE;
for (i = 0; i < n_ch; i++)
render->clear_color[i] = clear_color[i];
}
/**
* art_render_clear_rgb: Set clear color, given in RGB format.
* @clear_rgb: Clear color, in 0xRRGGBB format.
*
* Sets clear color, equivalent to actually clearing the destination
* buffer before rendering.
**/
void
art_render_clear_rgb (ArtRender *render, art_u32 clear_rgb)
{
if (render->n_chan != 3)
art_warn ("art_render_clear_rgb: called on render with %d channels, only works with 3\n",
render->n_chan);
else
{
int r, g, b;
render->clear = ART_TRUE;
r = clear_rgb >> 16;
g = (clear_rgb >> 8) & 0xff;
b = clear_rgb & 0xff;
render->clear_color[0] = ART_PIX_MAX_FROM_8(r);
render->clear_color[1] = ART_PIX_MAX_FROM_8(g);
render->clear_color[2] = ART_PIX_MAX_FROM_8(b);
}
}
static void
art_render_nop_done (ArtRenderCallback *self, ArtRender *render)
{
}
static void
art_render_clear_render_rgb8 (ArtRenderCallback *self, ArtRender *render,
art_u8 *dest, int y)
{
int width = render->x1 - render->x0;
art_u8 r, g, b;
ArtPixMaxDepth color_max;
color_max = render->clear_color[0];
r = ART_PIX_8_FROM_MAX (color_max);
color_max = render->clear_color[1];
g = ART_PIX_8_FROM_MAX (color_max);
color_max = render->clear_color[2];
b = ART_PIX_8_FROM_MAX (color_max);
art_rgb_fill_run (dest, r, g, b, width);
}
static void
art_render_clear_render_8 (ArtRenderCallback *self, ArtRender *render,
art_u8 *dest, int y)
{
int width = render->x1 - render->x0;
int i, j;
int n_ch = render->n_chan + (render->alpha_type != ART_ALPHA_NONE);
int ix;
art_u8 color[ART_MAX_CHAN + 1];
for (j = 0; j < n_ch; j++)
{
ArtPixMaxDepth color_max = render->clear_color[j];
color[j] = ART_PIX_8_FROM_MAX (color_max);
}
ix = 0;
for (i = 0; i < width; i++)
for (j = 0; j < n_ch; j++)
dest[ix++] = color[j];
}
const ArtRenderCallback art_render_clear_rgb8_obj =
{
art_render_clear_render_rgb8,
art_render_nop_done
};
const ArtRenderCallback art_render_clear_8_obj =
{
art_render_clear_render_8,
art_render_nop_done
};
#if ART_MAX_DEPTH >= 16
static void
art_render_clear_render_16 (ArtRenderCallback *self, ArtRender *render,
art_u8 *dest, int y)
{
int width = render->x1 - render->x0;
int i, j;
int n_ch = render->n_chan + (render->alpha_type != ART_ALPHA_NONE);
int ix;
art_u16 *dest_16 = (art_u16 *)dest;
art_u8 color[ART_MAX_CHAN + 1];
for (j = 0; j < n_ch; j++)
{
int color_16 = render->clear_color[j];
color[j] = color_16;
}
ix = 0;
for (i = 0; i < width; i++)
for (j = 0; j < n_ch; j++)
dest_16[ix++] = color[j];
}
const ArtRenderCallback art_render_clear_16_obj =
{
art_render_clear_render_16,
art_render_nop_done
};
#endif /* ART_MAX_DEPTH >= 16 */
/* todo: inline */
static ArtRenderCallback *
art_render_choose_clear_callback (ArtRender *render)
{
ArtRenderCallback *clear_callback;
if (render->depth == 8)
{
if (render->n_chan == 3 &&
render->alpha_type == ART_ALPHA_NONE)
clear_callback = (ArtRenderCallback *)&art_render_clear_rgb8_obj;
else
clear_callback = (ArtRenderCallback *)&art_render_clear_8_obj;
}
#if ART_MAX_DEPTH >= 16
else if (render->depth == 16)
clear_callback = (ArtRenderCallback *)&art_render_clear_16_obj;
#endif
else
{
art_die ("art_render_choose_clear_callback: inconsistent render->depth = %d\n",
render->depth);
}
return clear_callback;
}
#if 0
/* todo: get around to writing this */
static void
art_render_composite_render_noa_8_norm (ArtRenderCallback *self, ArtRender *render,
art_u8 *dest, int y)
{
int width = render->x1 - render->x0;
}
#endif
/* This is the most general form of the function. It is slow but
(hopefully) correct. Actually, I'm still worried about roundoff
errors in the premul case - it seems to me that an off-by-one could
lead to overflow. */
static void
art_render_composite (ArtRenderCallback *self, ArtRender *render,
art_u8 *dest, int y)
{
ArtRenderMaskRun *run = render->run;
art_u32 depth = render->depth;
int n_run = render->n_run;
int x0 = render->x0;
int x;
int run_x0, run_x1;
art_u8 *alpha_buf = render->alpha_buf;
art_u8 *image_buf = render->image_buf;
int i, j;
art_u32 tmp;
art_u32 run_alpha;
art_u32 alpha;
int image_ix;
art_u16 src[ART_MAX_CHAN + 1];
art_u16 dst[ART_MAX_CHAN + 1];
int n_chan = render->n_chan;
ArtAlphaType alpha_type = render->alpha_type;
int n_ch = n_chan + (alpha_type != ART_ALPHA_NONE);
int dst_pixstride = n_ch * (depth >> 3);
int buf_depth = render->buf_depth;
ArtAlphaType buf_alpha = render->buf_alpha;
int buf_n_ch = n_chan + (buf_alpha != ART_ALPHA_NONE);
int buf_pixstride = buf_n_ch * (buf_depth >> 3);
art_u8 *bufptr;
art_u32 src_alpha;
art_u32 src_mul;
art_u8 *dstptr;
art_u32 dst_alpha;
art_u32 dst_mul;
image_ix = 0;
for (i = 0; i < n_run - 1; i++)
{
run_x0 = run[i].x;
run_x1 = run[i + 1].x;
tmp = run[i].alpha;
if (tmp < 0x8100)
continue;
run_alpha = (tmp + (tmp >> 8) + (tmp >> 16) - 0x8000) >> 8; /* range [0 .. 0x10000] */
bufptr = image_buf + (run_x0 - x0) * buf_pixstride;
dstptr = dest + (run_x0 - x0) * dst_pixstride;
for (x = run_x0; x < run_x1; x++)
{
if (alpha_buf)
{
if (depth == 8)
{
tmp = run_alpha * alpha_buf[x - x0] + 0x80;
/* range 0x80 .. 0xff0080 */
alpha = (tmp + (tmp >> 8) + (tmp >> 16)) >> 8;
}
else /* (depth == 16) */
{
tmp = ((art_u16 *)alpha_buf)[x - x0];
tmp = (run_alpha * tmp + 0x8000) >> 8;
/* range 0x80 .. 0xffff80 */
alpha = (tmp + (tmp >> 16)) >> 8;
}
}
else
alpha = run_alpha;
/* alpha is run_alpha * alpha_buf[x], range 0 .. 0x10000 */
/* convert (src pixel * alpha) to premul alpha form,
store in src as 0..0xffff range */
if (buf_alpha == ART_ALPHA_NONE)
{
src_alpha = alpha;
src_mul = src_alpha;
}
else
{
if (buf_depth == 8)
{
tmp = alpha * bufptr[n_chan] + 0x80;
/* range 0x80 .. 0xff0080 */
src_alpha = (tmp + (tmp >> 8) + (tmp >> 16)) >> 8;
}
else /* (depth == 16) */
{
tmp = ((art_u16 *)bufptr)[n_chan];
tmp = (alpha * tmp + 0x8000) >> 8;
/* range 0x80 .. 0xffff80 */
src_alpha = (tmp + (tmp >> 16)) >> 8;
}
if (buf_alpha == ART_ALPHA_SEPARATE)
src_mul = src_alpha;
else /* buf_alpha == (ART_ALPHA_PREMUL) */
src_mul = alpha;
}
/* src_alpha is the (alpha of the source pixel * alpha),
range 0..0x10000 */
if (buf_depth == 8)
{
src_mul *= 0x101;
for (j = 0; j < n_chan; j++)
src[j] = (bufptr[j] * src_mul + 0x8000) >> 16;
}
else if (buf_depth == 16)
{
for (j = 0; j < n_chan; j++)
src[j] = (((art_u16 *)bufptr)[j] * src_mul + 0x8000) >> 16;
}
bufptr += buf_pixstride;
/* src[0..n_chan - 1] (range 0..0xffff) and src_alpha (range
0..0x10000) now contain the source pixel with
premultiplied alpha */
/* convert dst pixel to premul alpha form,
store in dst as 0..0xffff range */
if (alpha_type == ART_ALPHA_NONE)
{
dst_alpha = 0x10000;
dst_mul = dst_alpha;
}
else
{
if (depth == 8)
{
tmp = dstptr[n_chan];
/* range 0..0xff */
dst_alpha = (tmp << 8) + tmp + (tmp >> 7);
}
else /* (depth == 16) */
{
tmp = ((art_u16 *)dstptr)[n_chan];
dst_alpha = (tmp + (tmp >> 15));
}
if (alpha_type == ART_ALPHA_SEPARATE)
dst_mul = dst_alpha;
else /* (alpha_type == ART_ALPHA_PREMUL) */
dst_mul = 0x10000;
}
/* dst_alpha is the alpha of the dest pixel,
range 0..0x10000 */
if (depth == 8)
{
dst_mul *= 0x101;
for (j = 0; j < n_chan; j++)
dst[j] = (dstptr[j] * dst_mul + 0x8000) >> 16;
}
else if (buf_depth == 16)
{
for (j = 0; j < n_chan; j++)
dst[j] = (((art_u16 *)dstptr)[j] * dst_mul + 0x8000) >> 16;
}
/* do the compositing, dst = (src over dst) */
for (j = 0; j < n_chan; j++)
{
art_u32 srcv, dstv;
art_u32 tmp;
srcv = src[j];
dstv = dst[j];
tmp = ((dstv * (0x10000 - src_alpha) + 0x8000) >> 16) + srcv;
tmp -= tmp >> 16;
dst[j] = tmp;
}
if (alpha_type == ART_ALPHA_NONE)
{
if (depth == 8)
dst_mul = 0xff;
else /* (depth == 16) */
dst_mul = 0xffff;
}
else
{
if (src_alpha >= 0x10000)
dst_alpha = 0x10000;
else
dst_alpha += ((((0x10000 - dst_alpha) * src_alpha) >> 8) + 0x80) >> 8;
if (alpha_type == ART_ALPHA_PREMUL || dst_alpha == 0)
{
if (depth == 8)
dst_mul = 0xff;
else /* (depth == 16) */
dst_mul = 0xffff;
}
else /* (ALPHA_TYPE == ART_ALPHA_SEPARATE && dst_alpha != 0) */
{
if (depth == 8)
dst_mul = 0xff0000 / dst_alpha;
else /* (depth == 16) */
dst_mul = 0xffff0000 / dst_alpha;
}
}
if (depth == 8)
{
for (j = 0; j < n_chan; j++)
dstptr[j] = (dst[j] * dst_mul + 0x8000) >> 16;
if (alpha_type != ART_ALPHA_NONE)
dstptr[n_chan] = (dst_alpha * 0xff + 0x8000) >> 16;
}
else if (depth == 16)
{
for (j = 0; j < n_chan; j++)
((art_u16 *)dstptr)[j] = (dst[j] * dst_mul + 0x8000) >> 16;
if (alpha_type != ART_ALPHA_NONE)
((art_u16 *)dstptr)[n_chan] = (dst_alpha * 0xffff + 0x8000) >> 16;
}
dstptr += dst_pixstride;
}
}
}
const ArtRenderCallback art_render_composite_obj =
{
art_render_composite,
art_render_nop_done
};
static void
art_render_composite_8 (ArtRenderCallback *self, ArtRender *render,
art_u8 *dest, int y)
{
ArtRenderMaskRun *run = render->run;
int n_run = render->n_run;
int x0 = render->x0;
int x;
int run_x0, run_x1;
art_u8 *alpha_buf = render->alpha_buf;
art_u8 *image_buf = render->image_buf;
int i, j;
art_u32 tmp;
art_u32 run_alpha;
art_u32 alpha;
int image_ix;
int n_chan = render->n_chan;
ArtAlphaType alpha_type = render->alpha_type;
int n_ch = n_chan + (alpha_type != ART_ALPHA_NONE);
int dst_pixstride = n_ch;
ArtAlphaType buf_alpha = render->buf_alpha;
int buf_n_ch = n_chan + (buf_alpha != ART_ALPHA_NONE);
int buf_pixstride = buf_n_ch;
art_u8 *bufptr;
art_u32 src_alpha;
art_u32 src_mul;
art_u8 *dstptr;
art_u32 dst_alpha;
art_u32 dst_mul, dst_save_mul;
image_ix = 0;
for (i = 0; i < n_run - 1; i++)
{
run_x0 = run[i].x;
run_x1 = run[i + 1].x;
tmp = run[i].alpha;
if (tmp < 0x10000)
continue;
run_alpha = (tmp + (tmp >> 8) + (tmp >> 16) - 0x8000) >> 8; /* range [0 .. 0x10000] */
bufptr = image_buf + (run_x0 - x0) * buf_pixstride;
dstptr = dest + (run_x0 - x0) * dst_pixstride;
for (x = run_x0; x < run_x1; x++)
{
if (alpha_buf)
{
tmp = run_alpha * alpha_buf[x - x0] + 0x80;
/* range 0x80 .. 0xff0080 */
alpha = (tmp + (tmp >> 8) + (tmp >> 16)) >> 8;
}
else
alpha = run_alpha;
/* alpha is run_alpha * alpha_buf[x], range 0 .. 0x10000 */
/* convert (src pixel * alpha) to premul alpha form,
store in src as 0..0xffff range */
if (buf_alpha == ART_ALPHA_NONE)
{
src_alpha = alpha;
src_mul = src_alpha;
}
else
{
tmp = alpha * bufptr[n_chan] + 0x80;
/* range 0x80 .. 0xff0080 */
src_alpha = (tmp + (tmp >> 8) + (tmp >> 16)) >> 8;
if (buf_alpha == ART_ALPHA_SEPARATE)
src_mul = src_alpha;
else /* buf_alpha == (ART_ALPHA_PREMUL) */
src_mul = alpha;
}
/* src_alpha is the (alpha of the source pixel * alpha),
range 0..0x10000 */
src_mul *= 0x101;
if (alpha_type == ART_ALPHA_NONE)
{
dst_alpha = 0x10000;
dst_mul = dst_alpha;
}
else
{
tmp = dstptr[n_chan];
/* range 0..0xff */
dst_alpha = (tmp << 8) + tmp + (tmp >> 7);
if (alpha_type == ART_ALPHA_SEPARATE)
dst_mul = dst_alpha;
else /* (alpha_type == ART_ALPHA_PREMUL) */
dst_mul = 0x10000;
}
/* dst_alpha is the alpha of the dest pixel,
range 0..0x10000 */
dst_mul *= 0x101;
if (alpha_type == ART_ALPHA_NONE)
{
dst_save_mul = 0xff;
}
else
{
if (src_alpha >= 0x10000)
dst_alpha = 0x10000;
else
dst_alpha += ((((0x10000 - dst_alpha) * src_alpha) >> 8) + 0x80) >> 8;
if (alpha_type == ART_ALPHA_PREMUL || dst_alpha == 0)
{
dst_save_mul = 0xff;
}
else /* (ALPHA_TYPE == ART_ALPHA_SEPARATE && dst_alpha != 0) */
{
dst_save_mul = 0xff0000 / dst_alpha;
}
}
for (j = 0; j < n_chan; j++)
{
art_u32 src, dst;
art_u32 tmp;
src = (bufptr[j] * src_mul + 0x8000) >> 16;
dst = (dstptr[j] * dst_mul + 0x8000) >> 16;
tmp = ((dst * (0x10000 - src_alpha) + 0x8000) >> 16) + src;
tmp -= tmp >> 16;
dstptr[j] = (tmp * dst_save_mul + 0x8000) >> 16;
}
if (alpha_type != ART_ALPHA_NONE)
dstptr[n_chan] = (dst_alpha * 0xff + 0x8000) >> 16;
bufptr += buf_pixstride;
dstptr += dst_pixstride;
}
}
}
const ArtRenderCallback art_render_composite_8_obj =
{
art_render_composite_8,
art_render_nop_done
};
/* Assumes:
* alpha_buf is NULL
* buf_alpha = ART_ALPHA_NONE (source)
* alpha_type = ART_ALPHA_SEPARATE (dest)
* n_chan = 3;
*/
static void
art_render_composite_8_opt1 (ArtRenderCallback *self, ArtRender *render,
art_u8 *dest, int y)
{
ArtRenderMaskRun *run = render->run;
int n_run = render->n_run;
int x0 = render->x0;
int x;
int run_x0, run_x1;
art_u8 *image_buf = render->image_buf;
int i, j;
art_u32 tmp;
art_u32 run_alpha;
int image_ix;
art_u8 *bufptr;
art_u32 src_mul;
art_u8 *dstptr;
art_u32 dst_alpha;
art_u32 dst_mul, dst_save_mul;
image_ix = 0;
for (i = 0; i < n_run - 1; i++)
{
run_x0 = run[i].x;
run_x1 = run[i + 1].x;
tmp = run[i].alpha;
if (tmp < 0x10000)
continue;
run_alpha = (tmp + (tmp >> 8) + (tmp >> 16) - 0x8000) >> 8; /* range [0 .. 0x10000] */
bufptr = image_buf + (run_x0 - x0) * 3;
dstptr = dest + (run_x0 - x0) * 4;
if (run_alpha == 0x10000)
{
for (x = run_x0; x < run_x1; x++)
{
*dstptr++ = *bufptr++;
*dstptr++ = *bufptr++;
*dstptr++ = *bufptr++;
*dstptr++ = 0xff;
}
}
else
{
for (x = run_x0; x < run_x1; x++)
{
src_mul = run_alpha * 0x101;
tmp = dstptr[3];
/* range 0..0xff */
dst_alpha = (tmp << 8) + tmp + (tmp >> 7);
dst_mul = dst_alpha;
/* dst_alpha is the alpha of the dest pixel,
range 0..0x10000 */
dst_mul *= 0x101;
dst_alpha += ((((0x10000 - dst_alpha) * run_alpha) >> 8) + 0x80) >> 8;
if (dst_alpha == 0)
dst_save_mul = 0xff;
else /* (dst_alpha != 0) */
dst_save_mul = 0xff0000 / dst_alpha;
for (j = 0; j < 3; j++)
{
art_u32 src, dst;
art_u32 tmp;
src = (bufptr[j] * src_mul + 0x8000) >> 16;
dst = (dstptr[j] * dst_mul + 0x8000) >> 16;
tmp = ((dst * (0x10000 - run_alpha) + 0x8000) >> 16) + src;
tmp -= tmp >> 16;
dstptr[j] = (tmp * dst_save_mul + 0x8000) >> 16;
}
dstptr[3] = (dst_alpha * 0xff + 0x8000) >> 16;
bufptr += 3;
dstptr += 4;
}
}
}
}
const ArtRenderCallback art_render_composite_8_opt1_obj =
{
art_render_composite_8_opt1,
art_render_nop_done
};
/* Assumes:
* alpha_buf is NULL
* buf_alpha = ART_ALPHA_PREMUL (source)
* alpha_type = ART_ALPHA_SEPARATE (dest)
* n_chan = 3;
*/
static void
art_render_composite_8_opt2 (ArtRenderCallback *self, ArtRender *render,
art_u8 *dest, int y)
{
ArtRenderMaskRun *run = render->run;
int n_run = render->n_run;
int x0 = render->x0;
int x;
int run_x0, run_x1;
art_u8 *image_buf = render->image_buf;
int i, j;
art_u32 tmp;
art_u32 run_alpha;
int image_ix;
art_u8 *bufptr;
art_u32 src_alpha;
art_u32 src_mul;
art_u8 *dstptr;
art_u32 dst_alpha;
art_u32 dst_mul, dst_save_mul;
image_ix = 0;
for (i = 0; i < n_run - 1; i++)
{
run_x0 = run[i].x;
run_x1 = run[i + 1].x;
tmp = run[i].alpha;
if (tmp < 0x10000)
continue;
run_alpha = (tmp + (tmp >> 8) + (tmp >> 16) - 0x8000) >> 8; /* range [0 .. 0x10000] */
bufptr = image_buf + (run_x0 - x0) * 4;
dstptr = dest + (run_x0 - x0) * 4;
if (run_alpha == 0x10000)
{
for (x = run_x0; x < run_x1; x++)
{
src_alpha = (bufptr[3] << 8) + bufptr[3] + (bufptr[3] >> 7);
/* src_alpha is the (alpha of the source pixel),
range 0..0x10000 */
dst_alpha = (dstptr[3] << 8) + dstptr[3] + (dstptr[3] >> 7);
/* dst_alpha is the alpha of the dest pixel,
range 0..0x10000 */
dst_mul = dst_alpha*0x101;
if (src_alpha >= 0x10000)
dst_alpha = 0x10000;
else
dst_alpha += ((((0x10000 - dst_alpha) * src_alpha) >> 8) + 0x80) >> 8;
if (dst_alpha == 0)
dst_save_mul = 0xff;
else /* dst_alpha != 0) */
dst_save_mul = 0xff0000 / dst_alpha;
for (j = 0; j < 3; j++)
{
art_u32 src, dst;
art_u32 tmp;
src = (bufptr[j] << 8) | bufptr[j];
dst = (dstptr[j] * dst_mul + 0x8000) >> 16;
tmp = ((dst * (0x10000 - src_alpha) + 0x8000) >> 16) + src;
tmp -= tmp >> 16;
dstptr[j] = (tmp * dst_save_mul + 0x8000) >> 16;
}
dstptr[3] = (dst_alpha * 0xff + 0x8000) >> 16;
bufptr += 4;
dstptr += 4;
}
}
else
{
for (x = run_x0; x < run_x1; x++)
{
tmp = run_alpha * bufptr[3] + 0x80;
/* range 0x80 .. 0xff0080 */
src_alpha = (tmp + (tmp >> 8) + (tmp >> 16)) >> 8;
/* src_alpha is the (alpha of the source pixel * alpha),
range 0..0x10000 */
src_mul = run_alpha * 0x101;
tmp = dstptr[3];
/* range 0..0xff */
dst_alpha = (tmp << 8) + tmp + (tmp >> 7);
dst_mul = dst_alpha;
/* dst_alpha is the alpha of the dest pixel,
range 0..0x10000 */
dst_mul *= 0x101;
if (src_alpha >= 0x10000)
dst_alpha = 0x10000;
else
dst_alpha += ((((0x10000 - dst_alpha) * src_alpha) >> 8) + 0x80) >> 8;
if (dst_alpha == 0)
{
dst_save_mul = 0xff;
}
else /* dst_alpha != 0) */
{
dst_save_mul = 0xff0000 / dst_alpha;
}
for (j = 0; j < 3; j++)
{
art_u32 src, dst;
art_u32 tmp;
src = (bufptr[j] * src_mul + 0x8000) >> 16;
dst = (dstptr[j] * dst_mul + 0x8000) >> 16;
tmp = ((dst * (0x10000 - src_alpha) + 0x8000) >> 16) + src;
tmp -= tmp >> 16;
dstptr[j] = (tmp * dst_save_mul + 0x8000) >> 16;
}
dstptr[3] = (dst_alpha * 0xff + 0x8000) >> 16;
bufptr += 4;
dstptr += 4;
}
}
}
}
const ArtRenderCallback art_render_composite_8_opt2_obj =
{
art_render_composite_8_opt2,
art_render_nop_done
};
/* todo: inline */
static ArtRenderCallback *
art_render_choose_compositing_callback (ArtRender *render)
{
if (render->depth == 8 && render->buf_depth == 8)
{
if (render->n_chan == 3 &&
render->alpha_buf == NULL &&
render->alpha_type == ART_ALPHA_SEPARATE)
{
if (render->buf_alpha == ART_ALPHA_NONE)
return (ArtRenderCallback *)&art_render_composite_8_opt1_obj;
else if (render->buf_alpha == ART_ALPHA_PREMUL)
return (ArtRenderCallback *)&art_render_composite_8_opt2_obj;
}
return (ArtRenderCallback *)&art_render_composite_8_obj;
}
return (ArtRenderCallback *)&art_render_composite_obj;
}
/**
* art_render_invoke_callbacks: Invoke the callbacks in the render object.
* @render: The render object.
* @y: The current Y coordinate value.
*
* Invokes the callbacks of the render object in the appropriate
* order. Drivers should call this routine once per scanline.
*
* todo: should management of dest devolve to this routine? very
* plausibly yes.
**/
void
art_render_invoke_callbacks (ArtRender *render, art_u8 *dest, int y)
{
ArtRenderPriv *priv = (ArtRenderPriv *)render;
int i;
for (i = 0; i < priv->n_callbacks; i++)
{
ArtRenderCallback *callback;
callback = priv->callbacks[i];
callback->render (callback, render, dest, y);
}
}
/**
* art_render_invoke: Perform the requested rendering task.
* @render: The render object.
*
* Invokes the renderer and all sources associated with it, to perform
* the requested rendering task.
**/
void
art_render_invoke (ArtRender *render)
{
ArtRenderPriv *priv = (ArtRenderPriv *)render;
int width;
int best_driver, best_score;
int i;
int n_callbacks, n_callbacks_max;
ArtImageSource *image_source;
ArtImageSourceFlags image_flags;
int buf_depth;
ArtAlphaType buf_alpha;
art_boolean first = ART_TRUE;
if (render == NULL)
{
art_warn ("art_render_invoke: called with render == NULL\n");
return;
}
if (priv->image_source == NULL)
{
art_warn ("art_render_invoke: no image source given\n");
return;
}
width = render->x1 - render->x0;
render->run = art_new (ArtRenderMaskRun, width + 1);
/* Elect a mask source as driver. */
best_driver = -1;
best_score = 0;
for (i = 0; i < priv->n_mask_source; i++)
{
int score;
ArtMaskSource *mask_source;
mask_source = priv->mask_source[i];
score = mask_source->can_drive (mask_source, render);
if (score > best_score)
{
best_score = score;
best_driver = i;
}
}
/* Allocate alpha buffer if needed. */
if (priv->n_mask_source > 1 ||
(priv->n_mask_source == 1 && best_driver < 0))
{
render->alpha_buf = art_new (art_u8, (width * render->depth) >> 3);
}
/* Negotiate image rendering and compositing. */
image_source = priv->image_source;
image_source->negotiate (image_source, render, &image_flags, &buf_depth,
&buf_alpha);
/* Build callback list. */
n_callbacks_max = priv->n_mask_source + 3;
priv->callbacks = art_new (ArtRenderCallback *, n_callbacks_max);
n_callbacks = 0;
for (i = 0; i < priv->n_mask_source; i++)
if (i != best_driver)
{
ArtMaskSource *mask_source = priv->mask_source[i];
mask_source->prepare (mask_source, render, first);
first = ART_FALSE;
priv->callbacks[n_callbacks++] = &mask_source->super;
}
if (render->clear && !(image_flags & ART_IMAGE_SOURCE_CAN_CLEAR))
priv->callbacks[n_callbacks++] =
art_render_choose_clear_callback (render);
priv->callbacks[n_callbacks++] = &image_source->super;
/* Allocate image buffer and add compositing callback if needed. */
if (!(image_flags & ART_IMAGE_SOURCE_CAN_COMPOSITE))
{
int bytespp = ((render->n_chan + (buf_alpha != ART_ALPHA_NONE)) *
buf_depth) >> 3;
render->buf_depth = buf_depth;
render->buf_alpha = buf_alpha;
render->image_buf = art_new (art_u8, width * bytespp);
priv->callbacks[n_callbacks++] =
art_render_choose_compositing_callback (render);
}
priv->n_callbacks = n_callbacks;
if (render->need_span)
render->span_x = art_new (int, width + 1);
/* Invoke the driver */
if (best_driver >= 0)
{
ArtMaskSource *driver;
driver = priv->mask_source[best_driver];
driver->invoke_driver (driver, render);
}
else
{
art_u8 *dest_ptr = render->pixels;
int y;
/* Dummy driver */
render->n_run = 2;
render->run[0].x = render->x0;
render->run[0].alpha = 0x8000 + 0xff * render->opacity;
render->run[1].x = render->x1;
render->run[1].alpha = 0x8000;
if (render->need_span)
{
render->n_span = 2;
render->span_x[0] = render->x0;
render->span_x[1] = render->x1;
}
for (y = render->y0; y < render->y1; y++)
{
art_render_invoke_callbacks (render, dest_ptr, y);
dest_ptr += render->rowstride;
}
}
if (priv->mask_source != NULL)
art_free (priv->mask_source);
/* clean up callbacks */
for (i = 0; i < priv->n_callbacks; i++)
{
ArtRenderCallback *callback;
callback = priv->callbacks[i];
callback->done (callback, render);
}
/* Tear down object */
if (render->alpha_buf != NULL)
art_free (render->alpha_buf);
if (render->image_buf != NULL)
art_free (render->image_buf);
art_free (render->run);
if (render->span_x != NULL)
art_free (render->span_x);
art_free (priv->callbacks);
art_free (render);
}
/**
* art_render_mask_solid: Add a solid translucent mask.
* @render: The render object.
* @opacity: Opacity in [0..0x10000] form.
*
* Adds a translucent mask to the rendering object.
**/
void
art_render_mask_solid (ArtRender *render, int opacity)
{
art_u32 old_opacity = render->opacity;
art_u32 new_opacity_tmp;
if (opacity == 0x10000)
/* avoid potential overflow */
return;
new_opacity_tmp = old_opacity * (art_u32)opacity + 0x8000;
render->opacity = new_opacity_tmp >> 16;
}
/**
* art_render_add_mask_source: Add a mask source to the render object.
* @render: Render object.
* @mask_source: Mask source to add.
*
* This routine adds a mask source to the render object. In general,
* client api's for adding mask sources should just take a render object,
* then the mask source creation function should call this function.
* Clients should never have to call this function directly, unless of
* course they're creating custom mask sources.
**/
void
art_render_add_mask_source (ArtRender *render, ArtMaskSource *mask_source)
{
ArtRenderPriv *priv = (ArtRenderPriv *)render;
int n_mask_source = priv->n_mask_source++;
if (n_mask_source == 0)
priv->mask_source = art_new (ArtMaskSource *, 1);
/* This predicate is true iff n_mask_source is a power of two */
else if (!(n_mask_source & (n_mask_source - 1)))
priv->mask_source = art_renew (priv->mask_source, ArtMaskSource *,
n_mask_source << 1);
priv->mask_source[n_mask_source] = mask_source;
}
/**
* art_render_add_image_source: Add a mask source to the render object.
* @render: Render object.
* @image_source: Image source to add.
*
* This routine adds an image source to the render object. In general,
* client api's for adding image sources should just take a render
* object, then the mask source creation function should call this
* function. Clients should never have to call this function
* directly, unless of course they're creating custom image sources.
**/
void
art_render_add_image_source (ArtRender *render, ArtImageSource *image_source)
{
ArtRenderPriv *priv = (ArtRenderPriv *)render;
if (priv->image_source != NULL)
{
art_warn ("art_render_add_image_source: image source already present.\n");
return;
}
priv->image_source = image_source;
}
/* Solid image source object and methods. Perhaps this should go into a
separate file. */
typedef struct _ArtImageSourceSolid ArtImageSourceSolid;
struct _ArtImageSourceSolid {
ArtImageSource super;
ArtPixMaxDepth color[ART_MAX_CHAN];
art_u32 *rgbtab;
art_boolean init;
};
static void
art_render_image_solid_done (ArtRenderCallback *self, ArtRender *render)
{
ArtImageSourceSolid *z = (ArtImageSourceSolid *)self;
if (z->rgbtab != NULL)
art_free (z->rgbtab);
art_free (self);
}
static void
art_render_image_solid_rgb8_opaq_init (ArtImageSourceSolid *self, ArtRender *render)
{
ArtImageSourceSolid *z = (ArtImageSourceSolid *)self;
ArtPixMaxDepth color_max;
int r_fg, g_fg, b_fg;
int r_bg, g_bg, b_bg;
int r, g, b;
int dr, dg, db;
int i;
int tmp;
art_u32 *rgbtab;
rgbtab = art_new (art_u32, 256);
z->rgbtab = rgbtab;
color_max = self->color[0];
r_fg = ART_PIX_8_FROM_MAX (color_max);
color_max = self->color[1];
g_fg = ART_PIX_8_FROM_MAX (color_max);
color_max = self->color[2];
b_fg = ART_PIX_8_FROM_MAX (color_max);
color_max = render->clear_color[0];
r_bg = ART_PIX_8_FROM_MAX (color_max);
color_max = render->clear_color[1];
g_bg = ART_PIX_8_FROM_MAX (color_max);
color_max = render->clear_color[2];
b_bg = ART_PIX_8_FROM_MAX (color_max);
r = (r_bg << 16) + 0x8000;
g = (g_bg << 16) + 0x8000;
b = (b_bg << 16) + 0x8000;
tmp = ((r_fg - r_bg) << 16) + 0x80;
dr = (tmp + (tmp >> 8)) >> 8;
tmp = ((g_fg - g_bg) << 16) + 0x80;
dg = (tmp + (tmp >> 8)) >> 8;
tmp = ((b_fg - b_bg) << 16) + 0x80;
db = (tmp + (tmp >> 8)) >> 8;
for (i = 0; i < 256; i++)
{
rgbtab[i] = (r & 0xff0000) | ((g & 0xff0000) >> 8) | (b >> 16);
r += dr;
g += dg;
b += db;
}
}
static void
art_render_image_solid_rgb8_opaq (ArtRenderCallback *self, ArtRender *render,
art_u8 *dest, int y)
{
ArtImageSourceSolid *z = (ArtImageSourceSolid *)self;
ArtRenderMaskRun *run = render->run;
int n_run = render->n_run;
art_u32 *rgbtab = z->rgbtab;
art_u32 rgb;
int x0 = render->x0;
int x1 = render->x1;
int run_x0, run_x1;
int i;
int ix;
if (n_run > 0)
{
run_x1 = run[0].x;
if (run_x1 > x0)
{
rgb = rgbtab[0];
art_rgb_fill_run (dest,
rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
run_x1 - x0);
}
for (i = 0; i < n_run - 1; i++)
{
run_x0 = run_x1;
run_x1 = run[i + 1].x;
rgb = rgbtab[(run[i].alpha >> 16) & 0xff];
ix = (run_x0 - x0) * 3;
#define OPTIMIZE_LEN_1
#ifdef OPTIMIZE_LEN_1
if (run_x1 - run_x0 == 1)
{
dest[ix] = rgb >> 16;
dest[ix + 1] = (rgb >> 8) & 0xff;
dest[ix + 2] = rgb & 0xff;
}
else
{
art_rgb_fill_run (dest + ix,
rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
run_x1 - run_x0);
}
#else
art_rgb_fill_run (dest + ix,
rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
run_x1 - run_x0);
#endif
}
}
else
{
run_x1 = x0;
}
if (run_x1 < x1)
{
rgb = rgbtab[0];
art_rgb_fill_run (dest + (run_x1 - x0) * 3,
rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
x1 - run_x1);
}
}
static void
art_render_image_solid_rgb8 (ArtRenderCallback *self, ArtRender *render,
art_u8 *dest, int y)
{
ArtImageSourceSolid *z = (ArtImageSourceSolid *)self;
int width = render->x1 - render->x0;
art_u8 r, g, b;
ArtPixMaxDepth color_max;
/* todo: replace this simple test with real sparseness */
if (z->init)
return;
z->init = ART_TRUE;
color_max = z->color[0];
r = ART_PIX_8_FROM_MAX (color_max);
color_max = z->color[1];
g = ART_PIX_8_FROM_MAX (color_max);
color_max = z->color[2];
b = ART_PIX_8_FROM_MAX (color_max);
art_rgb_fill_run (render->image_buf, r, g, b, width);
}
static void
art_render_image_solid_negotiate (ArtImageSource *self, ArtRender *render,
ArtImageSourceFlags *p_flags,
int *p_buf_depth, ArtAlphaType *p_alpha)
{
ArtImageSourceSolid *z = (ArtImageSourceSolid *)self;
ArtImageSourceFlags flags = 0;
static void (*render_cbk) (ArtRenderCallback *self, ArtRender *render,
art_u8 *dest, int y);
render_cbk = NULL;
if (render->depth == 8 && render->n_chan == 3 &&
render->alpha_type == ART_ALPHA_NONE)
{
if (render->clear)
{
render_cbk = art_render_image_solid_rgb8_opaq;
flags |= ART_IMAGE_SOURCE_CAN_CLEAR | ART_IMAGE_SOURCE_CAN_COMPOSITE;
art_render_image_solid_rgb8_opaq_init (z, render);
}
}
if (render_cbk == NULL)
{
if (render->depth == 8)
{
render_cbk = art_render_image_solid_rgb8;
*p_buf_depth = 8;
*p_alpha = ART_ALPHA_NONE; /* todo */
}
}
/* todo: general case */
self->super.render = render_cbk;
*p_flags = flags;
}
/**
* art_render_image_solid: Add a solid color image source.
* @render: The render object.
* @color: Color.
*
* Adds an image source with the solid color given by @color. The
* color need not be retained in memory after this call.
**/
void
art_render_image_solid (ArtRender *render, ArtPixMaxDepth *color)
{
ArtImageSourceSolid *image_source;
int i;
image_source = art_new (ArtImageSourceSolid, 1);
image_source->super.super.render = NULL;
image_source->super.super.done = art_render_image_solid_done;
image_source->super.negotiate = art_render_image_solid_negotiate;
for (i = 0; i < render->n_chan; i++)
image_source->color[i] = color[i];
image_source->rgbtab = NULL;
image_source->init = ART_FALSE;
art_render_add_image_source (render, &image_source->super);
}
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