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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 3584 | sourcerer | 1 | /* |
| 2 | * Copyright 2009 Vincent Sanders |
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| 3 | * |
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| 4 | * This file is part of libnsfb, http://www.netsurf-browser.org/ |
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| 5 | * Licenced under the MIT License, |
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| 6 | * http://www.opensource.org/licenses/mit-license.php |
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| 7 | */ |
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| 8 | |||
| 9 | #include |
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| 10 | #include |
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| 11 | #include |
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| 12 | |||
| 13 | #include "libnsfb.h" |
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| 14 | #include "libnsfb_plot.h" |
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| 15 | #include "libnsfb_plot_util.h" |
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| 16 | |||
| 17 | #include "nsfb.h" |
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| 18 | #include "plot.h" |
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| 19 | |||
| 20 | static inline uint8_t * |
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| 21 | get_xy_loc(nsfb_t *nsfb, int x, int y) |
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| 22 | { |
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| 23 | return (uint8_t *)(nsfb->ptr + (y * nsfb->linelen) + (x * 3)); |
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| 24 | } |
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| 25 | |||
| 26 | #if __BYTE_ORDER == __BIG_ENDIAN |
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| 27 | static inline nsfb_colour_t pixel_to_colour(uint8_t pixel) |
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| 28 | { |
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| 29 | return (pixel >> 8) & ~0xFF000000U; |
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| 30 | } |
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| 31 | |||
| 32 | /* convert a colour value to a 32bpp pixel value ready for screen output */ |
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| 33 | static inline uint32_t colour_to_pixel(nsfb_colour_t c) |
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| 34 | { |
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| 35 | return (c << 8); |
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| 36 | } |
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| 37 | #else /* __BYTE_ORDER == __BIG_ENDIAN */ |
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| 38 | static inline nsfb_colour_t pixel_to_colour(uint32_t pixel) |
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| 39 | { |
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| 40 | return ((pixel & 0xFF) << 16) | |
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| 41 | ((pixel & 0xFF00)) | |
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| 42 | ((pixel & 0xFF0000) >> 16); |
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| 43 | } |
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| 44 | |||
| 45 | /* convert a colour value to a 32bpp pixel value ready for screen output */ |
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| 46 | static inline uint32_t colour_to_pixel(nsfb_colour_t c) |
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| 47 | { |
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| 48 | return ((c & 0xff0000) >> 16) | (c & 0xff00) | ((c & 0xff) << 16); |
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| 49 | } |
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| 50 | #endif |
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| 51 | |||
| 52 | #define SIGN(x) ((x<0) ? -1 : ((x>0) ? 1 : 0)) |
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| 53 | |||
| 54 | static bool |
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| 55 | line(nsfb_t *nsfb, int linec, nsfb_bbox_t *line, nsfb_plot_pen_t *pen) |
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| 56 | { |
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| 57 | int w; |
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| 58 | uint32_t ent; |
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| 59 | uint32_t *pvideo; |
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| 60 | int x, y, i; |
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| 61 | int dx, dy, sdy; |
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| 62 | int dxabs, dyabs; |
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| 63 | |||
| 64 | ent = colour_to_pixel(pen->stroke_colour); |
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| 65 | |||
| 66 | for (;linec > 0; linec--) { |
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| 67 | |||
| 68 | if (line->y0 == line->y1) { |
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| 69 | /* horizontal line special cased */ |
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| 70 | |||
| 71 | if (!nsfb_plot_clip_ctx(nsfb, line)) { |
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| 72 | /* line outside clipping */ |
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| 73 | line++; |
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| 74 | continue; |
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| 75 | } |
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| 76 | |||
| 77 | pvideo = get_xy_loc(nsfb, line->x0, line->y0); |
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| 78 | |||
| 79 | w = line->x1 - line->x0; |
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| 80 | while (w-- > 0) |
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| 81 | *(pvideo + w) = ent; |
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| 82 | |||
| 83 | } else { |
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| 84 | /* standard bresenham line */ |
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| 85 | |||
| 86 | if (!nsfb_plot_clip_line_ctx(nsfb, line)) { |
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| 87 | /* line outside clipping */ |
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| 88 | line++; |
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| 89 | continue; |
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| 90 | } |
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| 91 | |||
| 92 | /* the horizontal distance of the line */ |
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| 93 | dx = line->x1 - line->x0; |
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| 94 | dxabs = abs (dx); |
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| 95 | |||
| 96 | /* the vertical distance of the line */ |
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| 97 | dy = line->y1 - line->y0; |
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| 98 | dyabs = abs (dy); |
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| 99 | |||
| 100 | sdy = dx ? SIGN(dy) * SIGN(dx) : SIGN(dy); |
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| 101 | |||
| 102 | if (dx >= 0) |
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| 103 | pvideo = get_xy_loc(nsfb, line->x0, line->y0); |
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| 104 | else |
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| 105 | pvideo = get_xy_loc(nsfb, line->x1, line->y1); |
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| 106 | |||
| 107 | x = dyabs >> 1; |
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| 108 | y = dxabs >> 1; |
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| 109 | |||
| 110 | if (dxabs >= dyabs) { |
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| 111 | /* the line is more horizontal than vertical */ |
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| 112 | for (i = 0; i < dxabs; i++) { |
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| 113 | *pvideo = ent; |
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| 114 | |||
| 115 | pvideo++; |
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| 116 | y += dyabs; |
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| 117 | if (y >= dxabs) { |
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| 118 | y -= dxabs; |
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| 119 | pvideo += sdy * (nsfb->linelen>>2); |
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| 120 | } |
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| 121 | } |
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| 122 | } else { |
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| 123 | /* the line is more vertical than horizontal */ |
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| 124 | for (i = 0; i < dyabs; i++) { |
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| 125 | *pvideo = ent; |
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| 126 | pvideo += sdy * (nsfb->linelen >> 2); |
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| 127 | |||
| 128 | x += dxabs; |
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| 129 | if (x >= dyabs) { |
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| 130 | x -= dyabs; |
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| 131 | pvideo++; |
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| 132 | } |
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| 133 | } |
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| 134 | } |
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| 135 | |||
| 136 | } |
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| 137 | line++; |
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| 138 | } |
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| 139 | return true; |
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| 140 | } |
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| 141 | |||
| 142 | |||
| 143 | |||
| 144 | static bool fill(nsfb_t *nsfb, nsfb_bbox_t *rect, nsfb_colour_t c) |
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| 145 | { |
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| 146 | int w; |
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| 147 | uint32_t *pvid; |
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| 148 | uint32_t ent; |
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| 149 | uint32_t llen; |
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| 150 | uint32_t width; |
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| 151 | uint32_t height; |
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| 152 | |||
| 153 | if (!nsfb_plot_clip_ctx(nsfb, rect)) |
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| 154 | return true; /* fill lies outside current clipping region */ |
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| 155 | |||
| 156 | ent = colour_to_pixel(c); |
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| 157 | width = rect->x1 - rect->x0; |
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| 158 | height = rect->y1 - rect->y0; |
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| 159 | llen = (nsfb->linelen >> 2) - width; |
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| 160 | |||
| 161 | pvid = get_xy_loc(nsfb, rect->x0, rect->y0); |
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| 162 | |||
| 163 | while (height-- > 0) { |
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| 164 | w = width; |
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| 165 | while (w >= 16) { |
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| 166 | *pvid++ = ent; *pvid++ = ent; |
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| 167 | *pvid++ = ent; *pvid++ = ent; |
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| 168 | *pvid++ = ent; *pvid++ = ent; |
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| 169 | *pvid++ = ent; *pvid++ = ent; |
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| 170 | *pvid++ = ent; *pvid++ = ent; |
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| 171 | *pvid++ = ent; *pvid++ = ent; |
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| 172 | *pvid++ = ent; *pvid++ = ent; |
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| 173 | *pvid++ = ent; *pvid++ = ent; |
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| 174 | w-=16; |
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| 175 | } |
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| 176 | while (w >= 4) { |
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| 177 | *pvid++ = ent; *pvid++ = ent; |
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| 178 | *pvid++ = ent; *pvid++ = ent; |
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| 179 | w-=4; |
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| 180 | } |
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| 181 | while (w > 0) { |
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| 182 | *pvid++ = ent; |
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| 183 | w--; |
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| 184 | } |
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| 185 | pvid += llen; |
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| 186 | } |
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| 187 | |||
| 188 | return true; |
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| 189 | } |
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| 190 | |||
| 191 | |||
| 192 | |||
| 193 | |||
| 194 | static bool point(nsfb_t *nsfb, int x, int y, nsfb_colour_t c) |
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| 195 | { |
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| 196 | uint32_t *pvideo; |
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| 197 | |||
| 198 | /* check point lies within clipping region */ |
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| 199 | if ((x < nsfb->clip.x0) || |
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| 200 | (x >= nsfb->clip.x1) || |
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| 201 | (y < nsfb->clip.y0) || |
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| 202 | (y >= nsfb->clip.y1)) |
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| 203 | return true; |
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| 204 | |||
| 205 | pvideo = get_xy_loc(nsfb, x, y); |
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| 206 | |||
| 207 | if ((c & 0xFF000000) != 0) { |
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| 208 | if ((c & 0xFF000000) != 0xFF000000) { |
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| 209 | c = nsfb_plot_ablend(c, pixel_to_colour(*pvideo)); |
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| 210 | } |
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| 211 | |||
| 212 | *pvideo = colour_to_pixel(c); |
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| 213 | } |
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| 214 | return true; |
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| 215 | } |
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| 216 | |||
| 217 | static bool |
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| 218 | glyph1(nsfb_t *nsfb, |
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| 219 | nsfb_bbox_t *loc, |
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| 220 | const uint8_t *pixel, |
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| 221 | int pitch, |
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| 222 | nsfb_colour_t c) |
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| 223 | { |
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| 224 | uint32_t *pvideo; |
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| 225 | int xloop, yloop; |
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| 226 | int xoff, yoff; /* x and y offset into image */ |
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| 227 | int x = loc->x0; |
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| 228 | int y = loc->y0; |
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| 229 | int width = loc->x1 - loc->x0; |
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| 230 | int height = loc->y1 - loc->y0; |
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| 231 | uint32_t fgcol; |
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| 232 | const uint8_t *fntd; |
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| 233 | uint8_t row; |
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| 234 | |||
| 235 | if (!nsfb_plot_clip_ctx(nsfb, loc)) |
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| 236 | return true; |
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| 237 | |||
| 238 | if (height > (loc->y1 - loc->y0)) |
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| 239 | height = (loc->y1 - loc->y0); |
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| 240 | |||
| 241 | if (width > (loc->x1 - loc->x0)) |
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| 242 | width = (loc->x1 - loc->x0); |
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| 243 | |||
| 244 | xoff = loc->x0 - x; |
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| 245 | yoff = loc->y0 - y; |
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| 246 | |||
| 247 | pvideo = get_xy_loc(nsfb, loc->x0, loc->y0); |
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| 248 | |||
| 249 | fgcol = colour_to_pixel(c); |
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| 250 | |||
| 251 | for (yloop = yoff; yloop < height; yloop++) { |
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| 252 | fntd = pixel + (yloop * (pitch>>3)) + (xoff>>3); |
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| 253 | row = (*fntd++) << (xoff & 3); |
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| 254 | for (xloop = xoff; xloop < width ; xloop++) { |
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| 255 | if (((xloop % 8) == 0) && (xloop != 0)) { |
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| 256 | row = *fntd++; |
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| 257 | } |
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| 258 | |||
| 259 | if ((row & 0x80) != 0) { |
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| 260 | *(pvideo + xloop) = fgcol; |
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| 261 | } |
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| 262 | row = row << 1; |
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| 263 | |||
| 264 | } |
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| 265 | |||
| 266 | pvideo += (nsfb->linelen >> 2); |
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| 267 | } |
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| 268 | |||
| 269 | return true; |
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| 270 | } |
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| 271 | |||
| 272 | static bool |
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| 273 | glyph8(nsfb_t *nsfb, |
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| 274 | nsfb_bbox_t *loc, |
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| 275 | const uint8_t *pixel, |
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| 276 | int pitch, |
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| 277 | nsfb_colour_t c) |
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| 278 | { |
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| 279 | uint32_t *pvideo; |
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| 280 | nsfb_colour_t abpixel; /* alphablended pixel */ |
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| 281 | int xloop, yloop; |
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| 282 | int xoff, yoff; /* x and y offset into image */ |
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| 283 | int x = loc->x0; |
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| 284 | int y = loc->y0; |
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| 285 | int width = loc->x1 - loc->x0; |
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| 286 | int height = loc->y1 - loc->y0; |
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| 287 | uint32_t fgcol; |
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| 288 | |||
| 289 | if (!nsfb_plot_clip_ctx(nsfb, loc)) |
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| 290 | return true; |
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| 291 | |||
| 292 | if (height > (loc->y1 - loc->y0)) |
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| 293 | height = (loc->y1 - loc->y0); |
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| 294 | |||
| 295 | if (width > (loc->x1 - loc->x0)) |
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| 296 | width = (loc->x1 - loc->x0); |
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| 297 | |||
| 298 | xoff = loc->x0 - x; |
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| 299 | yoff = loc->y0 - y; |
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| 300 | |||
| 301 | pvideo = get_xy_loc(nsfb, loc->x0, loc->y0); |
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| 302 | |||
| 303 | fgcol = c & 0xFFFFFF; |
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| 304 | |||
| 305 | for (yloop = 0; yloop < height; yloop++) { |
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| 306 | for (xloop = 0; xloop < width; xloop++) { |
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| 307 | abpixel = (pixel[((yoff + yloop) * pitch) + xloop + xoff] << 24) | fgcol; |
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| 308 | if ((abpixel & 0xFF000000) != 0) { |
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| 309 | /* pixel is not transparent */ |
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| 310 | if ((abpixel & 0xFF000000) != 0xFF000000) { |
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| 311 | abpixel = nsfb_plot_ablend(abpixel, |
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| 312 | pixel_to_colour(*(pvideo + xloop))); |
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| 313 | } |
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| 314 | |||
| 315 | *(pvideo + xloop) = colour_to_pixel(abpixel); |
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| 316 | } |
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| 317 | } |
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| 318 | pvideo += (nsfb->linelen >> 2); |
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| 319 | } |
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| 320 | |||
| 321 | return true; |
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| 322 | } |
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| 323 | |||
| 324 | static bool |
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| 325 | bitmap(nsfb_t *nsfb, |
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| 326 | const nsfb_bbox_t *loc, |
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| 327 | const nsfb_colour_t *pixel, |
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| 328 | int bmp_width, |
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| 329 | int bmp_height, |
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| 330 | int bmp_stride, |
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| 331 | bool alpha) |
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| 332 | { |
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| 333 | uint32_t *pvideo; |
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| 334 | nsfb_colour_t abpixel = 0; /* alphablended pixel */ |
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| 335 | int xloop, yloop; |
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| 336 | int xoff, yoff; /* x and y offset into image */ |
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| 337 | int x = loc->x0; |
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| 338 | int y = loc->y0; |
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| 339 | int width = loc->x1 - loc->x0; |
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| 340 | int height = loc->y1 - loc->y0; |
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| 341 | nsfb_bbox_t clipped; /* clipped display */ |
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| 342 | |||
| 343 | /* TODO here we should scale the image from bmp_width to width, for |
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| 344 | * now simply crop. |
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| 345 | */ |
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| 346 | if (width > bmp_width) |
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| 347 | width = bmp_width; |
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| 348 | |||
| 349 | if (height > bmp_height) |
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| 350 | height = bmp_height; |
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| 351 | |||
| 352 | /* The part of the scaled image actually displayed is cropped to the |
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| 353 | * current context. |
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| 354 | */ |
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| 355 | clipped.x0 = x; |
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| 356 | clipped.y0 = y; |
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| 357 | clipped.x1 = x + width; |
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| 358 | clipped.y1 = y + height; |
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| 359 | |||
| 360 | if (!nsfb_plot_clip_ctx(nsfb, &clipped)) { |
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| 361 | return true; |
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| 362 | } |
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| 363 | |||
| 364 | if (height > (clipped.y1 - clipped.y0)) |
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| 365 | height = (clipped.y1 - clipped.y0); |
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| 366 | |||
| 367 | if (width > (clipped.x1 - clipped.x0)) |
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| 368 | width = (clipped.x1 - clipped.x0); |
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| 369 | |||
| 370 | xoff = clipped.x0 - x; |
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| 371 | yoff = (clipped.y0 - y) * bmp_width; |
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| 372 | height = height * bmp_stride + yoff; |
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| 373 | |||
| 374 | /* plot the image */ |
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| 375 | pvideo = get_xy_loc(nsfb, clipped.x0, clipped.y0); |
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| 376 | |||
| 377 | if (alpha) { |
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| 378 | for (yloop = yoff; yloop < height; yloop += bmp_stride) { |
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| 379 | for (xloop = 0; xloop < width; xloop++) { |
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| 380 | abpixel = pixel[yloop + xloop + xoff]; |
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| 381 | if ((abpixel & 0xFF000000) != 0) { |
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| 382 | if ((abpixel & 0xFF000000) != 0xFF000000) { |
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| 383 | abpixel = nsfb_plot_ablend(abpixel, |
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| 384 | pixel_to_colour(*(pvideo + xloop))); |
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| 385 | } |
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| 386 | |||
| 387 | *(pvideo + xloop) = colour_to_pixel(abpixel); |
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| 388 | } |
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| 389 | } |
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| 390 | pvideo += (nsfb->linelen >> 2); |
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| 391 | } |
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| 392 | } else { |
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| 393 | for (yloop = yoff; yloop < height; yloop += bmp_stride) { |
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| 394 | for (xloop = 0; xloop < width; xloop++) { |
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| 395 | abpixel = pixel[yloop + xloop + xoff]; |
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| 396 | *(pvideo + xloop) = colour_to_pixel(abpixel); |
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| 397 | } |
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| 398 | pvideo += (nsfb->linelen >> 2); |
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| 399 | } |
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| 400 | } |
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| 401 | return true; |
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| 402 | } |
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| 403 | |||
| 404 | static bool readrect(nsfb_t *nsfb, nsfb_bbox_t *rect, nsfb_colour_t *buffer) |
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| 405 | { |
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| 406 | uint32_t *pvideo; |
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| 407 | int xloop, yloop; |
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| 408 | int width; |
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| 409 | |||
| 410 | if (!nsfb_plot_clip_ctx(nsfb, rect)) { |
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| 411 | return true; |
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| 412 | } |
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| 413 | |||
| 414 | width = rect->x1 - rect->x0; |
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| 415 | |||
| 416 | pvideo = get_xy_loc(nsfb, rect->x0, rect->y0); |
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| 417 | |||
| 418 | for (yloop = rect->y0; yloop < rect->y1; yloop += 1) { |
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| 419 | for (xloop = 0; xloop < width; xloop++) { |
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| 420 | *buffer = pixel_to_colour(*(pvideo + xloop)); |
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| 421 | buffer++; |
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| 422 | } |
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| 423 | pvideo += (nsfb->linelen >> 2); |
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| 424 | } |
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| 425 | return true; |
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| 426 | } |
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| 427 | |||
| 428 | const nsfb_plotter_fns_t _nsfb_24bpp_plotters = { |
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| 429 | .line = line, |
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| 430 | .fill = fill, |
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| 431 | .point = point, |
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| 432 | .bitmap = bitmap, |
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| 433 | .glyph8 = glyph8, |
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| 434 | .glyph1 = glyph1, |
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| 435 | .readrect = readrect, |
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| 436 | }; |
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| 437 | |||
| 438 | /* |
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| 439 | * Local Variables: |
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| 440 | * c-basic-offset:8 |
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| 441 | * End: |
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| 442 | */ |