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-rw-r--r--src/32bpp_plotters.c320
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diff --git a/src/32bpp_plotters.c b/src/32bpp_plotters.c
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+/*
+ * 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:
+ */
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