From 48ef4befd88e06e83a583a70f0172f1a08a65cda Mon Sep 17 00:00:00 2001 From: Alexander Larsson Date: Mon, 15 Feb 2010 09:40:50 +0100 Subject: [PATCH] Add pixman_region{32}_init_from_image This creates a region from an image in PIXMAN_a1 format. --- pixman/pixman-region.c | 256 +++++++++++++++++++++++++++++++++++++++++++++++++ pixman/pixman.h | 6 +- 2 files changed, 261 insertions(+), 1 deletion(-) diff --git a/pixman/pixman-region.c b/pixman/pixman-region.c index 9f7515c..830b458 100644 --- a/pixman/pixman-region.c +++ b/pixman/pixman-region.c @@ -42,6 +42,25 @@ * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS * SOFTWARE. * + * Copyright © 1998 Keith Packard + * + * Permission to use, copy, modify, distribute, and sell this software and its + * documentation for any purpose is hereby granted without fee, provided that + * the above copyright notice appear in all copies and that both that + * copyright notice and this permission notice appear in supporting + * documentation, and that the name of Keith Packard not be used in + * advertising or publicity pertaining to distribution of the software without + * specific, written prior permission. Keith Packard makes no + * representations about the suitability of this software for any purpose. It + * is provided "as is" without express or implied warranty. + * + * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO + * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, + * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER + * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. */ #include @@ -2539,3 +2558,240 @@ PREFIX (_init_rects) (region_type_t *region, return validate (region, &i); } + +#define READ(_ptr) (*(_ptr)) + +static inline box_type_t * +bitmap_addrect (region_type_t *reg, + box_type_t *r, + box_type_t **first_rect, + int rx1, int ry1, + int rx2, int ry2) +{ + if ((rx1 < rx2) && (ry1 < ry2) && + (!(reg->data->numRects && + ((r-1)->y1 == ry1) && ((r-1)->y2 == ry2) && + ((r-1)->x1 <= rx1) && ((r-1)->x2 >= rx2)))) + { + if (!reg->data || + reg->data->numRects == reg->data->size) + { + if (!pixman_rect_alloc (reg, 1)) + return NULL; + *first_rect = PIXREGION_BOXPTR(reg); + r = *first_rect + reg->data->numRects; + } + r->x1 = rx1; + r->y1 = ry1; + r->x2 = rx2; + r->y2 = ry2; + reg->data->numRects++; + if (r->x1 < reg->extents.x1) + reg->extents.x1 = r->x1; + if (r->x2 > reg->extents.x2) + reg->extents.x2 = r->x2; + r++; + } + return r; +} + +/* Convert bitmap clip mask into clipping region. + * First, goes through each line and makes boxes by noting the transitions + * from 0 to 1 and 1 to 0. + * Then it coalesces the current line with the previous if they have boxes + * at the same X coordinates. + * Stride is in number of uint32_t per line. + */ +PIXMAN_EXPORT void +PREFIX (_init_from_image) (region_type_t *region, + pixman_image_t *image) +{ + uint32_t mask0 = 0xffffffff & ~SCREEN_SHIFT_RIGHT(0xffffffff, 1); + box_type_t *first_rect, *rects, *prect_line_start; + box_type_t *old_rect, *new_rect; + uint32_t *pw, w, *pw_line, *pw_line_end; + int irect_prev_start, irect_line_start; + int h, base, rx1 = 0, crects; + int ib; + pixman_bool_t in_box, same; + int width, height, stride; + + PREFIX(_init) (region); + + return_if_fail (image->type == BITS); + return_if_fail (image->bits.format == PIXMAN_a1); + + pw_line = pixman_image_get_data (image); + width = pixman_image_get_width (image); + height = pixman_image_get_height (image); + stride = pixman_image_get_stride (image) / 4; + + first_rect = PIXREGION_BOXPTR(region); + rects = first_rect; + + region->extents.x1 = width - 1; + region->extents.x2 = 0; + irect_prev_start = -1; + for (h = 0; h < height; h++) + { + pw = pw_line; + pw_line += stride; + irect_line_start = rects - first_rect; + + /* If the Screen left most bit of the word is set, we're starting in + * a box */ + if (READ(pw) & mask0) + { + in_box = TRUE; + rx1 = 0; + } + else + { + in_box = FALSE; + } + + /* Process all words which are fully in the pixmap */ + pw_line_end = pw + (width >> 5); + for (base = 0; pw < pw_line_end; base += 32) + { + w = READ(pw++); + if (in_box) + { + if (!~w) + continue; + } + else + { + if (!w) + continue; + } + for (ib = 0; ib < 32; ib++) + { + /* If the Screen left most bit of the word is set, we're + * starting a box */ + if (w & mask0) + { + if (!in_box) + { + rx1 = base + ib; + /* start new box */ + in_box = TRUE; + } + } + else + { + if (in_box) + { + /* end box */ + rects = bitmap_addrect (region, rects, &first_rect, + rx1, h, base + ib, h + 1); + if (rects == NULL) + goto error; + in_box = FALSE; + } + } + /* Shift the word VISUALLY left one. */ + w = SCREEN_SHIFT_LEFT(w, 1); + } + } + + if (width & 31) + { + /* Process final partial word on line */ + w = READ(pw++); + for (ib = 0; ib < (width & 31); ib++) + { + /* If the Screen left most bit of the word is set, we're + * starting a box */ + if (w & mask0) + { + if (!in_box) + { + rx1 = base + ib; + /* start new box */ + in_box = TRUE; + } + } + else + { + if (in_box) + { + /* end box */ + rects = bitmap_addrect(region, rects, &first_rect, + rx1, h, base + ib, h + 1); + if (rects == NULL) + goto error; + in_box = FALSE; + } + } + /* Shift the word VISUALLY left one. */ + w = SCREEN_SHIFT_LEFT(w, 1); + } + } + /* If scanline ended with last bit set, end the box */ + if (in_box) + { + rects = bitmap_addrect(region, rects, &first_rect, + rx1, h, base + (width & 31), h + 1); + if (rects == NULL) + goto error; + } + /* if all rectangles on this line have the same x-coords as + * those on the previous line, then add 1 to all the previous y2s and + * throw away all the rectangles from this line + */ + same = FALSE; + if (irect_prev_start != -1) + { + crects = irect_line_start - irect_prev_start; + if (crects != 0 && + crects == ((rects - first_rect) - irect_line_start)) + { + old_rect = first_rect + irect_prev_start; + new_rect = prect_line_start = first_rect + irect_line_start; + same = TRUE; + while (old_rect < prect_line_start) + { + if ((old_rect->x1 != new_rect->x1) || + (old_rect->x2 != new_rect->x2)) + { + same = FALSE; + break; + } + old_rect++; + new_rect++; + } + if (same) + { + old_rect = first_rect + irect_prev_start; + while (old_rect < prect_line_start) + { + old_rect->y2 += 1; + old_rect++; + } + rects -= crects; + region->data->numRects -= crects; + } + } + } + if(!same) + irect_prev_start = irect_line_start; + } + if (!region->data->numRects) + { + region->extents.x1 = region->extents.x2 = 0; + } + else + { + region->extents.y1 = PIXREGION_BOXPTR(region)->y1; + region->extents.y2 = PIXREGION_END(region)->y2; + if (region->data->numRects == 1) + { + free (region->data); + region->data = NULL; + } + } + + error: + return; +} diff --git a/pixman/pixman.h b/pixman/pixman.h index 03a233e..5009c6d 100644 --- a/pixman/pixman.h +++ b/pixman/pixman.h @@ -170,6 +170,7 @@ struct pixman_transform /* forward declaration (sorry) */ struct pixman_box16; +typedef union pixman_image pixman_image_t; void pixman_transform_init_identity (struct pixman_transform *matrix); pixman_bool_t pixman_transform_point_3d (const struct pixman_transform *transform, @@ -401,6 +402,8 @@ pixman_bool_t pixman_region_init_rects (pixman_region16_t *reg int count); void pixman_region_init_with_extents (pixman_region16_t *region, pixman_box16_t *extents); +void pixman_region_init_from_image (pixman_region16_t *region, + pixman_image_t *image); void pixman_region_fini (pixman_region16_t *region); @@ -488,6 +491,8 @@ pixman_bool_t pixman_region32_init_rects (pixman_region32_t *r int count); void pixman_region32_init_with_extents (pixman_region32_t *region, pixman_box32_t *extents); +void pixman_region32_init_from_image (pixman_region32_t *region, + pixman_image_t *image); void pixman_region32_fini (pixman_region32_t *region); @@ -561,7 +566,6 @@ const char* pixman_version_string (void); /* * Images */ -typedef union pixman_image pixman_image_t; typedef struct pixman_indexed pixman_indexed_t; typedef struct pixman_gradient_stop pixman_gradient_stop_t; -- 2.7.4