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Added a gdk_draw_rgb_image_dithalign function.

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This commit is contained in:
Raph Levien 1998-08-31 22:18:18 +00:00
parent f2322ebeb4
commit 10dcedad06
9 changed files with 268 additions and 44 deletions
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6
ChangeLog
View File

@ -1,3 +1,9 @@
Mon Aug 31 15:18:19 1998 Raph Levien <raph@gimp.org>
* gdk/gdkrgb.[ch]: Added a gdk_draw_rgb_image_dithalign function,
which is good for images that scroll (makes the dither patterns
align correctly)
Sat Aug 29 14:50:56 PDT 1998 Manish Singh <yosh@gimp.org>
* gdk/gdkcolor.c:

6
ChangeLog.pre-2-0
View File

@ -1,3 +1,9 @@
Mon Aug 31 15:18:19 1998 Raph Levien <raph@gimp.org>
* gdk/gdkrgb.[ch]: Added a gdk_draw_rgb_image_dithalign function,
which is good for images that scroll (makes the dither patterns
align correctly)
Sat Aug 29 14:50:56 PDT 1998 Manish Singh <yosh@gimp.org>
* gdk/gdkcolor.c:

6
ChangeLog.pre-2-10
View File

@ -1,3 +1,9 @@
Mon Aug 31 15:18:19 1998 Raph Levien <raph@gimp.org>
* gdk/gdkrgb.[ch]: Added a gdk_draw_rgb_image_dithalign function,
which is good for images that scroll (makes the dither patterns
align correctly)
Sat Aug 29 14:50:56 PDT 1998 Manish Singh <yosh@gimp.org>
* gdk/gdkcolor.c:

6
ChangeLog.pre-2-2
View File

@ -1,3 +1,9 @@
Mon Aug 31 15:18:19 1998 Raph Levien <raph@gimp.org>
* gdk/gdkrgb.[ch]: Added a gdk_draw_rgb_image_dithalign function,
which is good for images that scroll (makes the dither patterns
align correctly)
Sat Aug 29 14:50:56 PDT 1998 Manish Singh <yosh@gimp.org>
* gdk/gdkcolor.c:

6
ChangeLog.pre-2-4
View File

@ -1,3 +1,9 @@
Mon Aug 31 15:18:19 1998 Raph Levien <raph@gimp.org>
* gdk/gdkrgb.[ch]: Added a gdk_draw_rgb_image_dithalign function,
which is good for images that scroll (makes the dither patterns
align correctly)
Sat Aug 29 14:50:56 PDT 1998 Manish Singh <yosh@gimp.org>
* gdk/gdkcolor.c:

6
ChangeLog.pre-2-6
View File

@ -1,3 +1,9 @@
Mon Aug 31 15:18:19 1998 Raph Levien <raph@gimp.org>
* gdk/gdkrgb.[ch]: Added a gdk_draw_rgb_image_dithalign function,
which is good for images that scroll (makes the dither patterns
align correctly)
Sat Aug 29 14:50:56 PDT 1998 Manish Singh <yosh@gimp.org>
* gdk/gdkcolor.c:

6
ChangeLog.pre-2-8
View File

@ -1,3 +1,9 @@
Mon Aug 31 15:18:19 1998 Raph Levien <raph@gimp.org>
* gdk/gdkrgb.[ch]: Added a gdk_draw_rgb_image_dithalign function,
which is good for images that scroll (makes the dither patterns
align correctly)
Sat Aug 29 14:50:56 PDT 1998 Manish Singh <yosh@gimp.org>
* gdk/gdkcolor.c:

257
gdk/gdkrgb.c
View File

@ -87,6 +87,9 @@ struct _GdkRgbInfo
gboolean dith_default;
gboolean bitmap; /* set true if in 1 bit per pixel mode */
GdkGC *own_gc;
/* Convert functions */
GdkRgbConvFunc conv;
GdkRgbConvFunc conv_d;
@ -539,7 +542,7 @@ gdk_rgb_init (void)
g_error ("gdk_rgb_init: WORDS_BIGENDIAN is defined, but this is a little endian machine.\n\n");
#else
if (((char *)byte_order)[0] != 1)
g_error ("gdk_rgb_init: WORDS_BIGENDIAN is not defined, but this is a little endian machine.\n\n");
g_error ("gdk_rgb_init: WORDS_BIGENDIAN is not defined, but this is a big endian machine.\n\n");
#endif
if (image_info == NULL)
@ -565,10 +568,16 @@ gdk_rgb_init (void)
image_info->stage_buf = NULL;
image_info->own_gc = NULL;
gdk_rgb_choose_visual ();
if (image_info->visual->depth == 4)
if ((image_info->visual->type == GDK_VISUAL_PSEUDO_COLOR ||
image_info->visual->type == GDK_VISUAL_STATIC_COLOR) &&
image_info->visual->depth < 8 &&
image_info->visual->depth >= 3)
{
image_info->cmap = gdk_colormap_get_system ();
gdk_rgb_colorcube_222 ();
}
else if (image_info->visual->type == GDK_VISUAL_PSEUDO_COLOR)
@ -615,10 +624,17 @@ gdk_rgb_init (void)
}
}
image_info->bitmap = (image_info->visual->depth == 1);
for (i = 0; i < N_IMAGES; i++)
static_image[i] = gdk_image_new (GDK_IMAGE_FASTEST,
image_info->visual,
IMAGE_WIDTH, IMAGE_HEIGHT);
if (image_info->bitmap)
static_image[i] = gdk_image_new_bitmap (image_info->visual,
g_malloc (IMAGE_WIDTH * IMAGE_HEIGHT >> 3),
IMAGE_WIDTH, IMAGE_HEIGHT);
else
static_image[i] = gdk_image_new (GDK_IMAGE_FASTEST,
image_info->visual,
IMAGE_WIDTH, IMAGE_HEIGHT);
image_info->bpp = static_image[0]->bpp;
@ -637,7 +653,7 @@ gdk_rgb_xpixel_from_rgb (guint32 rgb)
pixel = colorcube[((rgb & 0xf00000) >> 12) |
((rgb & 0xf000) >> 8) |
((rgb & 0xf0) >> 4)];
else if (image_info->visual->depth == 4 &&
else if (image_info->visual->depth < 8 &&
image_info->visual->type == GDK_VISUAL_STATIC_COLOR)
{
pixel = colorcube_d[((rgb & 0x800000) >> 17) |
@ -2108,7 +2124,7 @@ gdk_rgb_convert_truecolor_msb_d (GdkImage *image,
}
}
#define IMAGE_8BPP
/* This actually works for depths from 3 to 7 */
static void
gdk_rgb_convert_4 (GdkImage *image,
gint x0, gint y0, gint width, gint height,
@ -2132,7 +2148,6 @@ gdk_rgb_convert_4 (GdkImage *image,
dmp = DM[(y_align + y) & (DM_HEIGHT - 1)];
bp2 = bptr;
obptr = obuf;
#ifdef IMAGE_8BPP
for (x = 0; x < width; x += 1)
{
r = *bp2++;
@ -2144,32 +2159,131 @@ gdk_rgb_convert_4 (GdkImage *image,
(((b + dith) & 0x100) >> 8)];
obptr++;
}
#else
for (x = 0; x < width; x += 2)
{
r = *bp2++;
g = *bp2++;
b = *bp2++;
dith = (dmp[(x_align + x) & (DM_WIDTH - 1)] << 2) | 3;
pix0 = colorcube_d[(((r + dith) & 0x100) >> 2) |
(((g + dith) & 0x100) >> 5) |
(((b + dith) & 0x100) >> 8)];
r = *bp2++;
g = *bp2++;
b = *bp2++;
dith = (dmp[(x_align + x + 1) & (DM_WIDTH - 1)] << 2) | 3;
pix1 = colorcube_d[(((r + dith) & 0x100) >> 2) |
(((g + dith) & 0x100) >> 5) |
(((b + dith) & 0x100) >> 8)];
obptr[0] = (pix0 << 4) | pix1;
obptr++;
}
#endif
bptr += rowstride;
obuf += bpl;
}
}
/* This actually works for depths from 3 to 7 */
static void
gdk_rgb_convert_gray4 (GdkImage *image,
gint x0, gint y0, gint width, gint height,
guchar *buf, int rowstride,
gint x_align, gint y_align, GdkRgbCmap *cmap)
{
int x, y;
gint bpl;
guchar *obuf, *obptr;
guchar *bptr, *bp2;
gint r, g, b;
gint shift;
bptr = buf;
bpl = image->bpl;
obuf = ((guchar *)image->mem) + y0 * bpl + x0;
shift = 9 - image_info->visual->depth;
for (y = 0; y < height; y++)
{
bp2 = bptr;
obptr = obuf;
for (x = 0; x < width; x++)
{
r = *bp2++;
g = *bp2++;
b = *bp2++;
obptr[0] = (g + ((b + r) >> 1)) >> shift;
obptr++;
}
bptr += rowstride;
obuf += bpl;
}
}
/* This actually works for depths from 3 to 7 */
static void
gdk_rgb_convert_gray4_d (GdkImage *image,
gint x0, gint y0, gint width, gint height,
guchar *buf, int rowstride,
gint x_align, gint y_align, GdkRgbCmap *cmap)
{
int x, y;
gint bpl;
guchar *obuf, *obptr;
guchar *bptr, *bp2;
gint r, g, b;
guchar *dmp;
gint prec, right;
gint gray;
bptr = buf;
bpl = image->bpl;
obuf = ((guchar *)image->mem) + y0 * bpl + x0;
prec = image_info->visual->depth;
right = 8 - prec;
for (y = 0; y < height; y++)
{
bp2 = bptr;
obptr = obuf;
for (x = 0; x < width; x++)
{
dmp = DM[(y_align + y) & (DM_HEIGHT - 1)];
r = *bp2++;
g = *bp2++;
b = *bp2++;
gray = (g + ((b + r) >> 1)) >> 1;
gray += (dmp[(x_align + x) & (DM_WIDTH - 1)] << 2) >> prec;
obptr[0] = (gray - (gray >> prec)) >> right;
obptr++;
}
bptr += rowstride;
obuf += bpl;
}
}
static void
gdk_rgb_convert_1 (GdkImage *image,
gint x0, gint y0, gint width, gint height,
guchar *buf, int rowstride,
gint x_align, gint y_align,
GdkRgbCmap *cmap)
{
int x, y;
gint bpl;
guchar *obuf, *obptr;
guchar *bptr, *bp2;
gint r, g, b;
guchar *dmp;
gint dith;
guchar byte;
bptr = buf;
bpl = image->bpl;
obuf = ((guchar *)image->mem) + y0 * bpl + (x0 >> 3);
byte = 0; /* unnecessary, but it keeps gcc from complaining */
for (y = 0; y < height; y++)
{
dmp = DM[(y_align + y) & (DM_HEIGHT - 1)];
bp2 = bptr;
obptr = obuf;
for (x = 0; x < width; x++)
{
r = *bp2++;
g = *bp2++;
b = *bp2++;
dith = (dmp[(x_align + x) & (DM_WIDTH - 1)] << 4) | 4;
byte += byte + (r + g + g + b + dith > 1020);
if ((x & 7) == 7)
{
obptr[0] = byte;
obptr++;
}
}
if (x & 7)
obptr[0] = byte << (8 - (x & 7));
bptr += rowstride;
obuf += bpl;
}
}
/* Returns a pointer to the stage buffer. */
static guchar *
@ -2391,6 +2505,10 @@ gdk_rgb_select_conv (GdkImage *image)
bpp = image->bpp;
byte_order = image->byte_order;
if (gdk_rgb_verbose)
g_print ("Chose visual 0x%x, image bpp=%d, %s first\n",
(gint)(((GdkVisualPrivate *)image_info->visual)->xvisual->visualid),
bpp, byte_order == GDK_LSB_FIRST ? "lsb" : "msb");
#ifdef WORDS_BIGENDIAN
byterev = (byte_order == GDK_LSB_FIRST);
@ -2420,7 +2538,9 @@ gdk_rgb_select_conv (GdkImage *image)
image_info->dith_default = FALSE;
if (bpp == 2 && depth == 16 && !byterev &&
if (image_info->bitmap)
conv = gdk_rgb_convert_1;
else if (bpp == 2 && depth == 16 && !byterev &&
red_mask == 0xf800 && green_mask == 0x7e0 && blue_mask == 0x1f)
{
conv = gdk_rgb_convert_565;
@ -2500,7 +2620,13 @@ gdk_rgb_select_conv (GdkImage *image)
conv = gdk_rgb_convert_gray8;
conv_gray = gdk_rgb_convert_gray8_gray;
}
else if (depth == 4)
else if (depth < 8 && depth >= 3 && (vtype == GDK_VISUAL_STATIC_GRAY
|| vtype == GDK_VISUAL_GRAYSCALE))
{
conv = gdk_rgb_convert_gray4;
conv_d = gdk_rgb_convert_gray4_d;
}
else if (depth < 8 && depth >= 3)
{
conv = gdk_rgb_convert_4;
}
@ -2566,7 +2692,6 @@ gdk_rgb_alloc_scratch (gint width, gint height, gint *x0, gint *y0)
GdkImage *image;
gint idx;
if (width >= (IMAGE_WIDTH >> 1))
{
if (height >= (IMAGE_HEIGHT >> 1))
@ -2600,7 +2725,9 @@ gdk_rgb_alloc_scratch (gint width, gint height, gint *x0, gint *y0)
idx = vert_idx;
*x0 = vert_x;
*y0 = 0;
vert_x += (width + 3) & -4;
/* using 3 and -4 would be slightly more efficient on 32-bit machines
with > 1bpp displays */
vert_x += (width + 7) & -8;
}
else
{
@ -2621,7 +2748,7 @@ gdk_rgb_alloc_scratch (gint width, gint height, gint *x0, gint *y0)
idx = tile_idx;
*x0 = tile_x;
*y0 = tile_y1;
tile_x += (width + 3) & -4;
tile_x += (width + 7) & -8;
}
}
image = static_image[idx];
@ -2643,7 +2770,9 @@ gdk_draw_rgb_image_core (GdkDrawable *drawable,
gint pixstride,
gint rowstride,
GdkRgbConvFunc conv,
GdkRgbCmap *cmap)
GdkRgbCmap *cmap,
gint xdith,
gint ydith)
{
gint y0, x0;
gint xs0, ys0;
@ -2651,6 +2780,20 @@ gdk_draw_rgb_image_core (GdkDrawable *drawable,
gint width1, height1;
guchar *buf_ptr;
if (image_info->bitmap)
{
if (image_info->own_gc == NULL)
{
GdkColor color;
image_info->own_gc = gdk_gc_new (drawable);
gdk_color_white (image_info->cmap, &color);
gdk_gc_set_foreground (image_info->own_gc, &color);
gdk_color_black (image_info->cmap, &color);
gdk_gc_set_background (image_info->own_gc, &color);
}
gc = image_info->own_gc;
}
for (y0 = 0; y0 < height; y0 += IMAGE_HEIGHT)
{
height1 = MIN (height - y0, IMAGE_HEIGHT);
@ -2662,7 +2805,7 @@ gdk_draw_rgb_image_core (GdkDrawable *drawable,
image = gdk_rgb_alloc_scratch (width1, height1, &xs0, &ys0);
conv (image, xs0, ys0, width1, height1, buf_ptr, rowstride,
x + x0, y + y0, cmap);
x + x0 + xdith, y + y0 + ydith, cmap);
#ifndef DONT_ACTUALLY_DRAW
gdk_draw_image (drawable, gc,
@ -2687,10 +2830,36 @@ gdk_draw_rgb_image (GdkDrawable *drawable,
if (dith == GDK_RGB_DITHER_NONE || (dith == GDK_RGB_DITHER_NORMAL &&
!image_info->dith_default))
gdk_draw_rgb_image_core (drawable, gc, x, y, width, height,
rgb_buf, 3, rowstride, image_info->conv, NULL);
rgb_buf, 3, rowstride, image_info->conv, NULL,
0, 0);
else
gdk_draw_rgb_image_core (drawable, gc, x, y, width, height,
rgb_buf, 3, rowstride, image_info->conv_d, NULL);
rgb_buf, 3, rowstride, image_info->conv_d, NULL,
0, 0);
}
void
gdk_draw_rgb_image_dithalign (GdkDrawable *drawable,
GdkGC *gc,
gint x,
gint y,
gint width,
gint height,
GdkRgbDither dith,
guchar *rgb_buf,
gint rowstride,
gint xdith,
gint ydith)
{
if (dith == GDK_RGB_DITHER_NONE || (dith == GDK_RGB_DITHER_NORMAL &&
!image_info->dith_default))
gdk_draw_rgb_image_core (drawable, gc, x, y, width, height,
rgb_buf, 3, rowstride, image_info->conv, NULL,
xdith, ydith);
else
gdk_draw_rgb_image_core (drawable, gc, x, y, width, height,
rgb_buf, 3, rowstride, image_info->conv_d, NULL,
xdith, ydith);
}
void
@ -2708,11 +2877,11 @@ gdk_draw_rgb_32_image (GdkDrawable *drawable,
!image_info->dith_default))
gdk_draw_rgb_image_core (drawable, gc, x, y, width, height,
buf, 4, rowstride,
image_info->conv_32, NULL);
image_info->conv_32, NULL, 0, 0);
else
gdk_draw_rgb_image_core (drawable, gc, x, y, width, height,
buf, 4, rowstride,
image_info->conv_32_d, NULL);
image_info->conv_32_d, NULL, 0, 0);
}
static void
@ -2747,11 +2916,11 @@ gdk_draw_gray_image (GdkDrawable *drawable,
!image_info->dith_default))
gdk_draw_rgb_image_core (drawable, gc, x, y, width, height,
buf, 1, rowstride,
image_info->conv_gray, NULL);
image_info->conv_gray, NULL, 0, 0);
else
gdk_draw_rgb_image_core (drawable, gc, x, y, width, height,
buf, 1, rowstride,
image_info->conv_gray_d, NULL);
image_info->conv_gray_d, NULL, 0, 0);
}
GdkRgbCmap *
@ -2804,11 +2973,11 @@ gdk_draw_indexed_image (GdkDrawable *drawable,
!image_info->dith_default))
gdk_draw_rgb_image_core (drawable, gc, x, y, width, height,
buf, 1, rowstride,
image_info->conv_indexed, cmap);
image_info->conv_indexed, cmap, 0, 0);
else
gdk_draw_rgb_image_core (drawable, gc, x, y, width, height,
buf, 1, rowstride,
image_info->conv_indexed_d, cmap);
image_info->conv_indexed_d, cmap, 0, 0);
}
gboolean

13
gdk/gdkrgb.h
View File

@ -60,6 +60,19 @@ gdk_draw_rgb_image (GdkDrawable *drawable,
guchar *rgb_buf,
gint rowstride);
void
gdk_draw_rgb_image_dithalign (GdkDrawable *drawable,
GdkGC *gc,
gint x,
gint y,
gint width,
gint height,
GdkRgbDither dith,
guchar *rgb_buf,
gint rowstride,
gint xdith,
gint ydith);
void
gdk_draw_rgb_32_image (GdkDrawable *drawable,
GdkGC *gc,