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author | Vincent Sanders <vince@netsurf-browser.org> | 2009-04-08 10:17:09 +0000 |
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committer | Vincent Sanders <vince@netsurf-browser.org> | 2009-04-08 10:17:09 +0000 |
commit | 056e1ebed94379db41ebb2e40cc88a873cfb4411 (patch) | |
tree | d1d01c4b9f9d4c2c2b1db4b705e631d49cf2e6b0 /src/32bpp_plotters.c | |
download | libnsfb-056e1ebed94379db41ebb2e40cc88a873cfb4411.tar.gz libnsfb-056e1ebed94379db41ebb2e40cc88a873cfb4411.tar.bz2 |
initial commit of netsurf framebuffer library
svn path=/trunk/libnsfb/; revision=7060
Diffstat (limited to 'src/32bpp_plotters.c')
-rw-r--r-- | src/32bpp_plotters.c | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/src/32bpp_plotters.c b/src/32bpp_plotters.c new file mode 100644 index 0000000..eb6d162 --- /dev/null +++ b/src/32bpp_plotters.c @@ -0,0 +1,320 @@ +/* + * Copyright 2008 Vincent Sanders <vince@simtec.co.uk> + * + * This file is part of NetSurf, http://www.netsurf-browser.org/ + * + * NetSurf is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * NetSurf 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <stdbool.h> +#include <endian.h> +#include <stdlib.h> + +#include "libnsfb.h" +#include "nsfb.h" +#include "nsfb_plot.h" +#include "plotters.h" +#include "plot_util.h" + +/* global plot context */ +extern nsfb_t *_plot_nsfb; + +static inline uint32_t * +get_xy_loc(nsfb_t *nsfb, int x, int y) +{ + return (uint32_t *)(nsfb->ptr + (y * nsfb->linelen) + (x << 2)); +} + +#if __BYTE_ORDER == __BIG_ENDIAN +static inline nsfb_colour_t pixel_to_colour(uint32_t pixel) +{ + return (pixel >> 8) & ~0xFF000000U; +} + +/* convert a colour value to a 32bpp pixel value ready for screen output */ +static inline uint32_t colour_to_pixel(nsfb_colour_t c) +{ + return (c << 8); +} +#else /* __BYTE_ORDER == __BIG_ENDIAN */ +static inline nsfb_colour_t pixel_to_colour(uint32_t pixel) +{ + return ((pixel & 0xFF) << 16) | + ((pixel & 0xFF00)) | + ((pixel & 0xFF0000) >> 16); +} + +/* convert a colour value to a 32bpp pixel value ready for screen output */ +static inline uint32_t colour_to_pixel(nsfb_colour_t c) +{ + return ((c & 0xff0000) >> 16) | (c & 0xff00) | ((c & 0xff) << 16); +} +#endif + +#define SIGN(x) ((x<0) ? -1 : ((x>0) ? 1 : 0)) + +static bool +line(nsfb_t *nsfb, + nsfb_bbox_t *line, + int line_width, + nsfb_colour_t c, + bool dotted, + bool dashed) +{ + int w; + uint32_t ent; + uint32_t *pvideo; + int x, y, i; + int dx, dy, sdy; + int dxabs, dyabs; + + line_width = line_width; + dotted = dotted; + dashed = dashed; + + ent = colour_to_pixel(c); + + if (line->y0 == line->y1) { + /* horizontal line special cased */ + if (!nsfb_plot_clip_ctx(nsfb, line)) + return true; /* line outside clipping */ + + pvideo = get_xy_loc(nsfb, line->x0, line->y0); + + w = line->x1 - line->x0; + while (w-- > 0) + *(pvideo + w) = ent; + + return true; + } else { + /* standard bresenham line */ + if (!nsfb_plot_clip_line_ctx(nsfb, line)) + return true; /* line outside clipping */ + + /* the horizontal distance of the line */ + dx = line->x1 - line->x0; + dxabs = abs (dx); + + /* the vertical distance of the line */ + dy = line->y1 - line->y0; + dyabs = abs (dy); + + sdy = dx ? SIGN(dy) * SIGN(dx) : SIGN(dy); + + if (dx >= 0) + pvideo = get_xy_loc(nsfb, line->x0, line->y0); + else + pvideo = get_xy_loc(nsfb, line->x1, line->y1); + + x = dyabs >> 1; + y = dxabs >> 1; + + if (dxabs >= dyabs) { + /* the line is more horizontal than vertical */ + for (i = 0; i < dxabs; i++) { + *pvideo = ent; + + pvideo++; + y += dyabs; + if (y >= dxabs) { + y -= dxabs; + pvideo += sdy * (nsfb->linelen>>2); + } + } + } else { + /* the line is more vertical than horizontal */ + for (i = 0; i < dyabs; i++) { + *pvideo = ent; + pvideo += sdy * (nsfb->linelen >> 2); + + x += dxabs; + if (x >= dyabs) { + x -= dyabs; + pvideo++; + } + } + } + + } + + return true; +} + + + +static bool fill(nsfb_t *nsfb, nsfb_bbox_t *rect, nsfb_colour_t c) +{ + int w; + uint32_t *pvid; + uint32_t ent; + uint32_t llen; + uint32_t width; + uint32_t height; + + if (!nsfb_plot_clip_ctx(nsfb, rect)) + return true; /* fill lies outside current clipping region */ + + ent = colour_to_pixel(c); + width = rect->x1 - rect->x0; + height = rect->y1 - rect->y0; + llen = (nsfb->linelen >> 2) - width; + + pvid = get_xy_loc(nsfb, rect->x0, rect->y0); + + while (height-- > 0) { + w = width; + while (w >= 16) { + *pvid++ = ent; *pvid++ = ent; + *pvid++ = ent; *pvid++ = ent; + *pvid++ = ent; *pvid++ = ent; + *pvid++ = ent; *pvid++ = ent; + *pvid++ = ent; *pvid++ = ent; + *pvid++ = ent; *pvid++ = ent; + *pvid++ = ent; *pvid++ = ent; + *pvid++ = ent; *pvid++ = ent; + w-=16; + } + while (w >= 4) { + *pvid++ = ent; *pvid++ = ent; + *pvid++ = ent; *pvid++ = ent; + w-=4; + } + while (w > 0) { + *pvid++ = ent; + w--; + } + pvid += llen; + } + + return true; +} + + + + +static bool point(nsfb_t *nsfb, int x, int y, nsfb_colour_t c) +{ + uint32_t *pvideo; + + /* check point lies within clipping region */ + if ((x < nsfb->clip.x0) || + (x >= nsfb->clip.x1) || + (y < nsfb->clip.y0) || + (y >= nsfb->clip.y1)) + return true; + + pvideo = get_xy_loc(nsfb, x, y); + + if ((c & 0xFF000000) != 0) { + if ((c & 0xFF000000) != 0xFF000000) { + c = nsfb_plot_ablend(c, pixel_to_colour(*pvideo)); + } + + *pvideo = colour_to_pixel(c); + } + return true; +} + +static bool +bitmap(nsfb_t *nsfb, + nsfb_bbox_t *loc, + nsfb_colour_t *pixel, + int bmp_width, + int bmp_height, + int bmp_stride, + bool alpha) +{ + uint32_t *pvideo; + nsfb_colour_t abpixel = 0; /* alphablended pixel */ + int xloop, yloop; + int xoff, yoff; /* x and y offset into image */ + int x = loc->x0; + int y = loc->y0; + int width = loc->x1 - loc->x0; + int height = loc->y1 - loc->y0; + nsfb_bbox_t clipped; /* clipped display */ + + /* TODO here we should scale the image from bmp_width to width, for + * now simply crop. + */ + if (width > bmp_width) + width = bmp_width; + + if (height > bmp_height) + height = bmp_height; + + /* The part of the scaled image actually displayed is cropped to the + * current context. + */ + clipped.x0 = x; + clipped.y0 = y; + clipped.x1 = x + width; + clipped.y1 = y + height; + + if (!nsfb_plot_clip_ctx(nsfb, &clipped)) + return true; + + if (height > (clipped.y1 - clipped.y0)) + height = (clipped.y1 - clipped.y0); + + if (width > (clipped.x1 - clipped.x0)) + width = (clipped.x1 - clipped.x0); + + xoff = clipped.x0 - x; + yoff = (clipped.y0 - y) * bmp_width; + height = height * bmp_stride + yoff; + + /* plot the image */ + pvideo = get_xy_loc(nsfb, clipped.x0, clipped.y0); + + if (alpha) { + for (yloop = yoff; yloop < height; yloop += bmp_stride) { + for (xloop = 0; xloop < width; xloop++) { + abpixel = pixel[yloop + xloop + xoff]; + if ((abpixel & 0xFF000000) != 0) { + if ((abpixel & 0xFF000000) != 0xFF000000) { + abpixel = nsfb_plot_ablend(abpixel, + pixel_to_colour(*(pvideo + xloop))); + } + + *(pvideo + xloop) = colour_to_pixel(abpixel); + } + } + pvideo += (nsfb->linelen >> 2); + } + } else { + for (yloop = yoff; yloop < height; yloop += bmp_stride) { + for (xloop = 0; xloop < width; xloop++) { + abpixel = pixel[yloop + xloop + xoff]; + *(pvideo + xloop) = colour_to_pixel(abpixel); + } + pvideo += (nsfb->linelen >> 2); + } + } + return true; +} + + + +const nsfb_plotter_fns_t _nsfb_32bpp_plotters = { + .line = line, + .fill = fill, + .point = point, + .bitmap = bitmap, +}; + +/* + * Local Variables: + * c-basic-offset:8 + * End: + */ |