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diff --git a/src/plot/common.c b/src/plot/common.c
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+/*
+ * Copyright 2009 Vincent Sanders <vince@simtec.co.uk>
+ * Copyright 2010 Michael Drake <tlsa@netsurf-browser.org>
+ *
+ * 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:
+ */