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annotate packages/services/gfx/mw/current/src/drivers/fblin2rev.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
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1 /*
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2 * Copyright (c) 1999 Greg Haerr <greg@censoft.com>
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3 *
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4 * 2bpp Packed Linear Video Driver (reversed bit order)
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5 * For Psion S5
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6 *
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7 * In this driver, psd->linelen is line byte length, not line pixel length
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8 */
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9 /*#define NDEBUG*/
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10 #include <assert.h>
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11 #include <string.h>
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12 #include "device.h"
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13 #include "fb.h"
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14
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15 static unsigned char notmask[4] = { 0xfc, 0xf3, 0xcf, 0x3f };
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16
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17 /* Calc linelen and mmap size, return 0 on fail*/
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18 static int
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19 linear2_init(PSD psd)
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20 {
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21 if (!psd->size)
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22 psd->size = psd->yres * psd->linelen;
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23 /* linelen in bytes for bpp 1, 2, 4, 8 so no change*/
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24 return 1;
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25 }
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26
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27 /* Set pixel at x, y, to pixelval c*/
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28 static void
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29 linear2_drawpixel(PSD psd, MWCOORD x, MWCOORD y, MWPIXELVAL c)
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30 {
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31 ADDR8 addr = psd->addr;
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32
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33 assert (addr != 0);
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34 assert (x >= 0 && x < psd->xres);
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35 assert (y >= 0 && y < psd->yres);
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36 assert (c < psd->ncolors);
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37
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38 DRAWON;
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39 addr += (x>>2) + y * psd->linelen;
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40 if(gr_mode == MWMODE_XOR)
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41 *addr ^= c << ((x&3)<<1);
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42 else
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43 *addr = (*addr & notmask[x&3]) | (c << ((x&3)<<1));
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44 DRAWOFF;
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45 }
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46
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47 /* Read pixel at x, y*/
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48 static MWPIXELVAL
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49 linear2_readpixel(PSD psd, MWCOORD x, MWCOORD y)
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50 {
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51 ADDR8 addr = psd->addr;
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52
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53 assert (addr != 0);
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54 assert (x >= 0 && x < psd->xres);
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55 assert (y >= 0 && y < psd->yres);
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56
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57 return (addr[(x>>2) + y * psd->linelen] >> ((x&3)<<1) ) & 0x03;
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58 }
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59
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60 /* Draw horizontal line from x1,y to x2,y including final point*/
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61 static void
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62 linear2_drawhorzline(PSD psd, MWCOORD x1, MWCOORD x2, MWCOORD y, MWPIXELVAL c)
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63 {
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64 ADDR8 addr = psd->addr;
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65
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66 assert (addr != 0);
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67 assert (x1 >= 0 && x1 < psd->xres);
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68 assert (x2 >= 0 && x2 < psd->xres);
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69 assert (x2 >= x1);
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70 assert (y >= 0 && y < psd->yres);
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71 assert (c < psd->ncolors);
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72
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73 DRAWON;
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74 addr += (x1>>2) + y * psd->linelen;
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75 if(gr_mode == MWMODE_XOR) {
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76 while(x1 <= x2) {
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77 *addr ^= c << ((x1&3)<<1);
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78 if((++x1 & 3) == 0)
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79 ++addr;
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80 }
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81 } else {
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82 while(x1 <= x2) {
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83 *addr = (*addr & notmask[x1&3]) | (c << ((x1&3)<<1));
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84 if((++x1 & 3) == 0)
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85 ++addr;
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86 }
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87 }
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88 DRAWOFF;
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89 }
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90
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91 /* Draw a vertical line from x,y1 to x,y2 including final point*/
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92 static void
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93 linear2_drawvertline(PSD psd, MWCOORD x, MWCOORD y1, MWCOORD y2, MWPIXELVAL c)
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94 {
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95 ADDR8 addr = psd->addr;
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96 int linelen = psd->linelen;
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97
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98 assert (addr != 0);
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99 assert (x >= 0 && x < psd->xres);
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100 assert (y1 >= 0 && y1 < psd->yres);
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101 assert (y2 >= 0 && y2 < psd->yres);
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102 assert (y2 >= y1);
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103 assert (c < psd->ncolors);
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104
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105 DRAWON;
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106 addr += (x>>2) + y1 * linelen;
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107 if(gr_mode == MWMODE_XOR)
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108 while(y1++ <= y2) {
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109 *addr ^= c << ((x&3)<<1);
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110 addr += linelen;
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111 }
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112 else
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113 while(y1++ <= y2) {
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114 *addr = (*addr & notmask[x&3]) | (c << ((x&3)<<1));
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115 addr += linelen;
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116 }
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117 DRAWOFF;
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118 }
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119
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120 /* srccopy bitblt, opcode is currently ignored*/
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121 static void
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122 linear2_blit(PSD dstpsd, MWCOORD dstx, MWCOORD dsty, MWCOORD w, MWCOORD h,
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123 PSD srcpsd, MWCOORD srcx, MWCOORD srcy, long op)
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124 {
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125 ADDR8 dst;
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126 ADDR8 src;
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127 int i;
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128 int dlinelen = dstpsd->linelen;
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129 int slinelen = srcpsd->linelen;
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130
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131 assert (dstpsd->addr != 0);
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132 assert (dstx >= 0 && dstx < dstpsd->xres);
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133 assert (dsty >= 0 && dsty < dstpsd->yres);
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134 assert (w > 0);
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135 assert (h > 0);
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136 assert (srcpsd->addr != 0);
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137 assert (srcx >= 0 && srcx < srcpsd->xres);
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138 assert (srcy >= 0 && srcy < srcpsd->yres);
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139 assert (dstx+w <= dstpsd->xres);
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140 assert (dsty+h <= dstpsd->yres);
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141 assert (srcx+w <= srcpsd->xres);
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142 assert (srcy+h <= srcpsd->yres);
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143
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144 DRAWON;
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145 dst = dstpsd->addr + (dstx>>2) + dsty * dlinelen;
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146 src = srcpsd->addr + (srcx>>2) + srcy * slinelen;
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147 while(--h >= 0) {
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148 ADDR8 d = dst;
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149 ADDR8 s = src;
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150 MWCOORD dx = dstx;
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151 MWCOORD sx = srcx;
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152 for(i=0; i<w; ++i) {
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153 *d = (*d & notmask[dx&3]) |
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154 ((*s >> ((sx&3)<<1) & 0x03) << ((dx&3)<<1));
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155 if((++dx & 3) == 0)
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156 ++d;
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157 if((++sx & 3) == 0)
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158 ++s;
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159 }
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160 dst += dlinelen;
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161 src += slinelen;
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162 }
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163 DRAWOFF;
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164 }
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165
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166 SUBDRIVER fblinear2 = {
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167 linear2_init,
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168 linear2_drawpixel,
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169 linear2_readpixel,
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170 linear2_drawhorzline,
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171 linear2_drawvertline,
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172 gen_fillrect,
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173 linear2_blit
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174 };