From 7f7898eb7d743eb5741cfa31a25b0c5c68653568 Mon Sep 17 00:00:00 2001 From: Vincent Sanders Date: Fri, 9 Jul 2010 10:09:38 +0000 Subject: make some of the plot code common svn path=/trunk/libnsfb/; revision=10618 --- src/plot/common.c | 494 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 494 insertions(+) create mode 100644 src/plot/common.c (limited to 'src/plot/common.c') diff --git a/src/plot/common.c b/src/plot/common.c new file mode 100644 index 0000000..1fa23d8 --- /dev/null +++ b/src/plot/common.c @@ -0,0 +1,494 @@ +/* + * Copyright 2009 Vincent Sanders + * Copyright 2010 Michael Drake + * + * Plot code common to all bpp just with differing types + * + * This file is part of libnsfb, http://www.netsurf-browser.org/ + * Licenced under the MIT License, + * http://www.opensource.org/licenses/mit-license.php + */ + +#ifndef PLOT_TYPE +#error PLOT_TYPE must be set to uint16_6 or uint32_t +#endif +#ifndef PLOT_LINELEN +#error PLOT_LINELEN must be a macro to increment a line length +#endif + +#define SIGN(x) ((x<0) ? -1 : ((x>0) ? 1 : 0)) + +static bool +line(nsfb_t *nsfb, int linec, nsfb_bbox_t *line, nsfb_plot_pen_t *pen) +{ + int w; + PLOT_TYPE ent; + PLOT_TYPE *pvideo; + int x, y, i; + int dx, dy, sdy; + int dxabs, dyabs; + + ent = colour_to_pixel(nsfb, pen->stroke_colour); + + for (;linec > 0; linec--) { + + if (line->y0 == line->y1) { + /* horizontal line special cased */ + + if (!nsfb_plot_clip_ctx(nsfb, line)) { + /* line outside clipping */ + line++; + continue; + } + + pvideo = get_xy_loc(nsfb, line->x0, line->y0); + + w = line->x1 - line->x0; + while (w-- > 0) + *(pvideo + w) = ent; + + } else { + /* standard bresenham line */ + + if (!nsfb_plot_clip_line_ctx(nsfb, line)) { + /* line outside clipping */ + line++; + continue; + } + + /* 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 * PLOT_LINELEN(nsfb->linelen); + } + } + } else { + /* the line is more vertical than horizontal */ + for (i = 0; i < dyabs; i++) { + *pvideo = ent; + pvideo += sdy * PLOT_LINELEN(nsfb->linelen); + + x += dxabs; + if (x >= dyabs) { + x -= dyabs; + pvideo++; + } + } + } + + } + line++; + } + return true; +} + + +static bool point(nsfb_t *nsfb, int x, int y, nsfb_colour_t c) +{ + PLOT_TYPE *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(nsfb, *pvideo)); + } + + *pvideo = colour_to_pixel(nsfb, c); + } + return true; +} + +static bool +glyph1(nsfb_t *nsfb, + nsfb_bbox_t *loc, + const uint8_t *pixel, + int pitch, + nsfb_colour_t c) +{ + PLOT_TYPE *pvideo; + PLOT_TYPE fgcol; + 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; + const uint8_t *fntd; + uint8_t row; + + if (!nsfb_plot_clip_ctx(nsfb, loc)) + return true; + + if (height > (loc->y1 - loc->y0)) + height = (loc->y1 - loc->y0); + + if (width > (loc->x1 - loc->x0)) + width = (loc->x1 - loc->x0); + + xoff = loc->x0 - x; + yoff = loc->y0 - y; + + pvideo = get_xy_loc(nsfb, loc->x0, loc->y0); + + fgcol = colour_to_pixel(nsfb, c); + + for (yloop = yoff; yloop < height; yloop++) { + fntd = pixel + (yloop * (pitch>>3)) + (xoff>>3); + row = (*fntd++) << (xoff & 3); + for (xloop = xoff; xloop < width ; xloop++) { + if (((xloop % 8) == 0) && (xloop != 0)) { + row = *fntd++; + } + + if ((row & 0x80) != 0) { + *(pvideo + xloop) = fgcol; + } + row = row << 1; + + } + + pvideo += PLOT_LINELEN(nsfb->linelen); + } + + return true; +} + +static bool +glyph8(nsfb_t *nsfb, + nsfb_bbox_t *loc, + const uint8_t *pixel, + int pitch, + nsfb_colour_t c) +{ + PLOT_TYPE *pvideo; + PLOT_TYPE fgcol; + nsfb_colour_t abpixel; /* 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; + + if (!nsfb_plot_clip_ctx(nsfb, loc)) + return true; + + if (height > (loc->y1 - loc->y0)) + height = (loc->y1 - loc->y0); + + if (width > (loc->x1 - loc->x0)) + width = (loc->x1 - loc->x0); + + xoff = loc->x0 - x; + yoff = loc->y0 - y; + + pvideo = get_xy_loc(nsfb, loc->x0, loc->y0); + + fgcol = c & 0xFFFFFF; + + for (yloop = 0; yloop < height; yloop++) { + for (xloop = 0; xloop < width; xloop++) { + abpixel = (pixel[((yoff + yloop) * pitch) + xloop + xoff] << 24) | fgcol; + if ((abpixel & 0xFF000000) != 0) { + /* pixel is not transparent */ + if ((abpixel & 0xFF000000) != 0xFF000000) { + abpixel = nsfb_plot_ablend(abpixel, + pixel_to_colour(nsfb, *(pvideo + xloop))); + } + + *(pvideo + xloop) = colour_to_pixel(nsfb, abpixel); + } + } + pvideo += PLOT_LINELEN(nsfb->linelen); + } + + return true; +} + +static bool bitmap_scaled(nsfb_t *nsfb, const nsfb_bbox_t *loc, + const nsfb_colour_t *pixel, int bmp_width, int bmp_height, + int bmp_stride, bool alpha) +{ + PLOT_TYPE *pvideo; + PLOT_TYPE *pvideo_limit; + nsfb_colour_t abpixel; /* alphablended pixel */ + int xloop; + int xoff, yoff, xoffs; /* x and y offsets into image */ + int x = loc->x0; + int y = loc->y0; + int width = loc->x1 - loc->x0; /* size to scale to */ + int height = loc->y1 - loc->y0; /* size to scale to */ + int rheight, rwidth; /* post-clipping render area dimensions */ + int dx, dy; /* scale factor (integer part) */ + int dxr, dyr; /* scale factor (remainder) */ + int rx, ry, rxs; /* remainder trackers */ + nsfb_bbox_t clipped; /* clipped display */ + + /* 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; + + /* get height of rendering region, after clipping */ + if (height > (clipped.y1 - clipped.y0)) + rheight = (clipped.y1 - clipped.y0); + else + rheight = height; + + /* get width of rendering region, after clipping */ + if (width > (clipped.x1 - clipped.x0)) + rwidth = (clipped.x1 - clipped.x0); + else + rwidth = width; + + /* get veritcal (y) and horizontal (x) scale factors; both integer + * part and remainder */ + dx = bmp_width / width; + dy = (bmp_height / height) * bmp_stride; + dxr = bmp_width % width; + dyr = bmp_height % height; + + /* get start offsets to part of image being scaled, after clipping and + * set remainder trackers to correct starting value */ + if (clipped.x0 - x != 0) { + xoffs = ((clipped.x0 - x) * bmp_width) / width; + rxs = ((clipped.x0 - x) * bmp_width) % width; + } else { + xoffs = 0; + rxs = 0; + } + if (clipped.y0 - y != 0) { + yoff = (((clipped.y0 - y) * bmp_height) / height) * bmp_stride; + ry = ((clipped.y0 - y) * bmp_height) % height; + } else { + yoff = 0; + ry = 0; + } + + /* plot the image */ + pvideo = get_xy_loc(nsfb, clipped.x0, clipped.y0); + pvideo_limit = pvideo + PLOT_LINELEN(nsfb->linelen) * rheight; + if (alpha) { + for (; pvideo < pvideo_limit; pvideo += PLOT_LINELEN(nsfb->linelen)) { + /* looping through render area vertically */ + xoff = xoffs; + rx = rxs; + for (xloop = 0; xloop < rwidth; xloop++) { + /* looping through render area horizontally */ + /* get value of source pixel in question */ + abpixel = pixel[yoff + xoff]; + if ((abpixel & 0xFF000000) != 0) { + /* pixel is not transparent; have to + * plot something */ + if ((abpixel & 0xFF000000) != + 0xFF000000) { + /* pixel is not opaque; need to + * blend */ + abpixel = nsfb_plot_ablend( + abpixel, + pixel_to_colour( + nsfb, + *(pvideo + + xloop))); + } + /* plot pixel */ + *(pvideo + xloop) = colour_to_pixel(nsfb, abpixel); + } + /* handle horizontal interpolation */ + xoff += dx; + rx += dxr; + if (rx >= width) { + xoff++; + rx -= width; + } + } + /* handle vertical interpolation */ + yoff += dy; + ry += dyr; + if (ry >= height) { + yoff += bmp_stride; + ry -= height; + } + } + } else { + for (; pvideo < pvideo_limit; pvideo += PLOT_LINELEN(nsfb->linelen)) { + /* looping through render area vertically */ + xoff = xoffs; + rx = rxs; + for (xloop = 0; xloop < rwidth; xloop++) { + /* looping through render area horizontally */ + /* get value of source pixel in question */ + abpixel = pixel[yoff + xoff]; + /* plot pixel */ + *(pvideo + xloop) = colour_to_pixel(nsfb, abpixel); + + /* handle horizontal interpolation */ + xoff += dx; + rx += dxr; + if (rx >= width) { + xoff++; + rx -= width; + } + } + /* handle vertical interpolation */ + yoff += dy; + ry += dyr; + if (ry >= height) { + yoff += bmp_stride; + ry -= height; + } + } + } + return true; +} + +static bool +bitmap(nsfb_t *nsfb, + const nsfb_bbox_t *loc, + const nsfb_colour_t *pixel, + int bmp_width, + int bmp_height, + int bmp_stride, + bool alpha) +{ + PLOT_TYPE *pvideo; + nsfb_colour_t abpixel; /* 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 */ + + if (width == 0 || height == 0) + return true; + + /* Scaled bitmaps are handled by a separate function */ + if (width != bmp_width || height != bmp_height) + return bitmap_scaled(nsfb, loc, pixel, bmp_width, bmp_height, + bmp_stride, alpha); + + /* 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_stride; + 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) { + /* pixel is not transparent; have to + * plot something */ + if ((abpixel & 0xFF000000) != 0xFF000000) { + /* pixel is not opaque; need to + * blend */ + abpixel = nsfb_plot_ablend(abpixel, + pixel_to_colour(nsfb, *(pvideo + xloop))); + } + + *(pvideo + xloop) = colour_to_pixel(nsfb, abpixel); + } + } + pvideo += PLOT_LINELEN(nsfb->linelen); + } + } 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(nsfb, abpixel); + } + pvideo += PLOT_LINELEN(nsfb->linelen); + } + } + return true; +} + +static bool readrect(nsfb_t *nsfb, nsfb_bbox_t *rect, nsfb_colour_t *buffer) +{ + PLOT_TYPE *pvideo; + int xloop, yloop; + int width; + + if (!nsfb_plot_clip_ctx(nsfb, rect)) { + return true; + } + + width = rect->x1 - rect->x0; + + pvideo = get_xy_loc(nsfb, rect->x0, rect->y0); + + for (yloop = rect->y0; yloop < rect->y1; yloop += 1) { + for (xloop = 0; xloop < width; xloop++) { + *buffer = pixel_to_colour(nsfb, *(pvideo + xloop)); + buffer++; + } + pvideo += PLOT_LINELEN(nsfb->linelen); + } + return true; +} + + +/* + * Local Variables: + * c-basic-offset:8 + * End: + */ -- cgit v1.2.3