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1 ;
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2 ; x86 format converters for HERMES
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3 ; Copyright (c) 1998 Glenn Fielder (gaffer@gaffer.org)
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4 ; This source code is licensed under the GNU LGPL
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5 ;
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6 ; Please refer to the file COPYING.LIB contained in the distribution for
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7 ; licensing conditions
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8 ;
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9 ; Routines adjusted for Hermes by Christian Nentwich (brn@eleet.mcb.at)
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10 ; Used with permission.
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11 ;
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12
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13
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14 BITS 32
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15
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16 GLOBAL _ConvertX86p16_32RGB888
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17 GLOBAL _ConvertX86p16_32BGR888
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18 GLOBAL _ConvertX86p16_32RGBA888
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19 GLOBAL _ConvertX86p16_32BGRA888
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20 GLOBAL _ConvertX86p16_24RGB888
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21 GLOBAL _ConvertX86p16_24BGR888
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22 GLOBAL _ConvertX86p16_16BGR565
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23 GLOBAL _ConvertX86p16_16RGB555
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24 GLOBAL _ConvertX86p16_16BGR555
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25 GLOBAL _ConvertX86p16_8RGB332
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26
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27 EXTERN _ConvertX86
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28 EXTERN _x86return
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29
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30
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31 SECTION .text
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32
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33
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34
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35 _ConvertX86p16_16BGR565:
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36
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37 ; check short
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38 cmp ecx,BYTE 16
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39 ja .L3
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40
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41
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42 .L1 ; short loop
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43 mov al,[esi]
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44 mov ah,[esi+1]
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45 mov ebx,eax
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46 mov edx,eax
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47 shr eax,11
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48 and eax,BYTE 11111b
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49 and ebx,11111100000b
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50 shl edx,11
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51 add eax,ebx
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52 add eax,edx
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53 mov [edi],al
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54 mov [edi+1],ah
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55 add esi,BYTE 2
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56 add edi,BYTE 2
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57 dec ecx
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58 jnz .L1
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59 .L2
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60 jmp _x86return
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61
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62 .L3 ; head
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63 mov eax,edi
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64 and eax,BYTE 11b
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65 jz .L4
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66 mov al,[esi]
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67 mov ah,[esi+1]
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68 mov ebx,eax
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69 mov edx,eax
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70 shr eax,11
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71 and eax,BYTE 11111b
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72 and ebx,11111100000b
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73 shl edx,11
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74 add eax,ebx
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75 add eax,edx
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76 mov [edi],al
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77 mov [edi+1],ah
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78 add esi,BYTE 2
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79 add edi,BYTE 2
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80 dec ecx
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81
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82 .L4 ; save count
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83 push ecx
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84
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85 ; unroll twice
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86 shr ecx,1
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87
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88 ; point arrays to end
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89 lea esi,[esi+ecx*4]
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90 lea edi,[edi+ecx*4]
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91
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92 ; negative counter
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93 neg ecx
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94 jmp SHORT .L6
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95
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96 .L5 mov [edi+ecx*4-4],eax
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97 .L6 mov eax,[esi+ecx*4]
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98
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99 mov ebx,[esi+ecx*4]
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100 and eax,07E007E0h
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101
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102 mov edx,[esi+ecx*4]
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103 and ebx,0F800F800h
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104
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105 shr ebx,11
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106 and edx,001F001Fh
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107
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108 shl edx,11
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109 add eax,ebx
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110
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111 add eax,edx
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112 inc ecx
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113
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114 jnz .L5
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115
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116 mov [edi+ecx*4-4],eax
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117
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118 ; tail
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119 pop ecx
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120 and ecx,BYTE 1
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121 jz .L7
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122 mov al,[esi]
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123 mov ah,[esi+1]
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124 mov ebx,eax
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125 mov edx,eax
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126 shr eax,11
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127 and eax,BYTE 11111b
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128 and ebx,11111100000b
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129 shl edx,11
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130 add eax,ebx
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131 add eax,edx
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132 mov [edi],al
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133 mov [edi+1],ah
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134 add esi,BYTE 2
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135 add edi,BYTE 2
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136
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137 .L7
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138 jmp _x86return
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139
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140
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141
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142
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143
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144
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145 _ConvertX86p16_16RGB555:
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146
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147 ; check short
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148 cmp ecx,BYTE 32
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149 ja .L3
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150
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151
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152 .L1 ; short loop
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153 mov al,[esi]
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154 mov ah,[esi+1]
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155 mov ebx,eax
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156 shr ebx,1
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157 and ebx, 0111111111100000b
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158 and eax,BYTE 0000000000011111b
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159 add eax,ebx
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160 mov [edi],al
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161 mov [edi+1],ah
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162 add esi,BYTE 2
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163 add edi,BYTE 2
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164 dec ecx
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165 jnz .L1
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166 .L2
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167 jmp _x86return
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168
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169 .L3 ; head
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170 mov eax,edi
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171 and eax,BYTE 11b
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172 jz .L4
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173 mov al,[esi]
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174 mov ah,[esi+1]
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175 mov ebx,eax
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176 shr ebx,1
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177 and ebx, 0111111111100000b
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178 and eax,BYTE 0000000000011111b
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179 add eax,ebx
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180 mov [edi],al
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181 mov [edi+1],ah
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182 add esi,BYTE 2
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183 add edi,BYTE 2
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184 dec ecx
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185
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186 .L4 ; save ebp
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187 push ebp
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188
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189 ; save count
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190 push ecx
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191
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192 ; unroll four times
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193 shr ecx,2
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194
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195 ; point arrays to end
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196 lea esi,[esi+ecx*8]
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197 lea edi,[edi+ecx*8]
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198
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199 ; negative counter
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200 xor ebp,ebp
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201 sub ebp,ecx
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202
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203 .L5 mov eax,[esi+ebp*8] ; agi?
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204 mov ecx,[esi+ebp*8+4]
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205
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206 mov ebx,eax
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207 mov edx,ecx
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208
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209 and eax,0FFC0FFC0h
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210 and ecx,0FFC0FFC0h
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211
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212 shr eax,1
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213 and ebx,001F001Fh
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214
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215 shr ecx,1
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216 and edx,001F001Fh
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217
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218 add eax,ebx
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219 add ecx,edx
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220
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221 mov [edi+ebp*8],eax
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222 mov [edi+ebp*8+4],ecx
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223
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224 inc ebp
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225 jnz .L5
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226
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227 ; tail
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228 pop ecx
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229 .L6 and ecx,BYTE 11b
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230 jz .L7
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231 mov al,[esi]
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232 mov ah,[esi+1]
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233 mov ebx,eax
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234 shr ebx,1
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235 and ebx, 0111111111100000b
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236 and eax,BYTE 0000000000011111b
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237 add eax,ebx
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238 mov [edi],al
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239 mov [edi+1],ah
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240 add esi,BYTE 2
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241 add edi,BYTE 2
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242 dec ecx
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243 jmp SHORT .L6
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244
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245 .L7 pop ebp
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246 jmp _x86return
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247
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248
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249
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250
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251
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252
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253 _ConvertX86p16_16BGR555:
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254
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255 ; check short
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256 cmp ecx,BYTE 16
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257 ja .L3
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258
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259
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260 .L1 ; short loop
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261 mov al,[esi]
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262 mov ah,[esi+1]
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263 mov ebx,eax
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264 mov edx,eax
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265 shr eax,11
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266 and eax,BYTE 11111b
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267 shr ebx,1
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268 and ebx,1111100000b
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269 shl edx,10
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270 and edx,0111110000000000b
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271 add eax,ebx
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272 add eax,edx
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273 mov [edi],al
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274 mov [edi+1],ah
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275 add esi,BYTE 2
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276 add edi,BYTE 2
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277 dec ecx
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278 jnz .L1
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279 .L2
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280 jmp _x86return
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281
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282 .L3 ; head
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283 mov eax,edi
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284 and eax,BYTE 11b
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285 jz .L4
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286 mov al,[esi]
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287 mov ah,[esi+1]
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288 mov ebx,eax
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289 mov edx,eax
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290 shr eax,11
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291 and eax,BYTE 11111b
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292 shr ebx,1
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293 and ebx,1111100000b
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294 shl edx,10
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295 and edx,0111110000000000b
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296 add eax,ebx
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297 add eax,edx
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298 mov [edi],al
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299 mov [edi+1],ah
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300 add esi,BYTE 2
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301 add edi,BYTE 2
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302 dec ecx
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303
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304 .L4 ; save count
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305 push ecx
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306
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307 ; unroll twice
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308 shr ecx,1
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309
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310 ; point arrays to end
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311 lea esi,[esi+ecx*4]
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312 lea edi,[edi+ecx*4]
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313
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314 ; negative counter
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315 neg ecx
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316 jmp SHORT .L6
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317
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318 .L5 mov [edi+ecx*4-4],eax
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319 .L6 mov eax,[esi+ecx*4]
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320
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321 shr eax,1
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322 mov ebx,[esi+ecx*4]
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323
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324 and eax,03E003E0h
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325 mov edx,[esi+ecx*4]
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326
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327 and ebx,0F800F800h
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328
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329 shr ebx,11
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330 and edx,001F001Fh
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331
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332 shl edx,10
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333 add eax,ebx
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334
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335 add eax,edx
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336 inc ecx
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337
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338 jnz .L5
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339
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340 mov [edi+ecx*4-4],eax
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341
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342 ; tail
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343 pop ecx
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344 and ecx,BYTE 1
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345 jz .L7
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346 mov al,[esi]
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347 mov ah,[esi+1]
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348 mov ebx,eax
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349 mov edx,eax
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350 shr eax,11
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351 and eax,BYTE 11111b
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352 shr ebx,1
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353 and ebx,1111100000b
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354 shl edx,10
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355 and edx,0111110000000000b
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356 add eax,ebx
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357 add eax,edx
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358 mov [edi],al
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359 mov [edi+1],ah
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360 add esi,BYTE 2
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361 add edi,BYTE 2
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362
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363 .L7
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364 jmp _x86return
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365
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366
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367
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368
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369
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370
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371 _ConvertX86p16_8RGB332:
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372
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373 ; check short
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374 cmp ecx,BYTE 16
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375 ja .L3
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376
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377
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378 .L1 ; short loop
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379 mov al,[esi+0]
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380 mov ah,[esi+1]
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381 mov ebx,eax
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382 mov edx,eax
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383 and eax,BYTE 11000b ; blue
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384 shr eax,3
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385 and ebx,11100000000b ; green
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386 shr ebx,6
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387 and edx,1110000000000000b ; red
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388 shr edx,8
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389 add eax,ebx
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390 add eax,edx
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391 mov [edi],al
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392 add esi,BYTE 2
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393 inc edi
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394 dec ecx
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395 jnz .L1
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396 .L2
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397 jmp _x86return
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398
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399 .L3 mov eax,edi
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400 and eax,BYTE 11b
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401 jz .L4
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402 mov al,[esi+0]
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403 mov ah,[esi+1]
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404 mov ebx,eax
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405 mov edx,eax
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406 and eax,BYTE 11000b ; blue
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407 shr eax,3
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408 and ebx,11100000000b ; green
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409 shr ebx,6
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410 and edx,1110000000000000b ; red
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411 shr edx,8
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412 add eax,ebx
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413 add eax,edx
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414 mov [edi],al
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415 add esi,BYTE 2
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416 inc edi
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417 dec ecx
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418 jmp SHORT .L3
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419
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420 .L4 ; save ebp
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421 push ebp
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422
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423 ; save count
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424 push ecx
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425
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426 ; unroll 4 times
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427 shr ecx,2
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428
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429 ; prestep
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430 mov dl,[esi+0]
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431 mov bl,[esi+1]
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432 mov dh,[esi+2]
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433
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434 .L5 shl edx,16
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435 mov bh,[esi+3]
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436
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437 shl ebx,16
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438 mov dl,[esi+4]
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439
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440 mov dh,[esi+6]
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441 mov bl,[esi+5]
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442
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443 and edx,00011000000110000001100000011000b
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444 mov bh,[esi+7]
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445
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446 ror edx,16+3
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447 mov eax,ebx ; setup eax for reds
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448
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449 and ebx,00000111000001110000011100000111b
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450 and eax,11100000111000001110000011100000b ; reds
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451
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452 ror ebx,16-2
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453 add esi,BYTE 8
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454
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455 ror eax,16
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456 add edi,BYTE 4
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457
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458 add eax,ebx
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459 mov bl,[esi+1] ; greens
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460
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461 add eax,edx
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462 mov dl,[esi+0] ; blues
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463
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464 mov [edi-4],eax
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465 mov dh,[esi+2]
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466
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467 dec ecx
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468 jnz .L5
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469
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470 ; check tail
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471 pop ecx
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472 and ecx,BYTE 11b
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473 jz .L7
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474
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475 .L6 ; tail
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476 mov al,[esi+0]
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477 mov ah,[esi+1]
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478 mov ebx,eax
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479 mov edx,eax
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480 and eax,BYTE 11000b ; blue
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481 shr eax,3
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482 and ebx,11100000000b ; green
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483 shr ebx,6
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484 and edx,1110000000000000b ; red
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485 shr edx,8
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486 add eax,ebx
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487 add eax,edx
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488 mov [edi],al
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489 add esi,BYTE 2
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490 inc edi
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491 dec ecx
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492 jnz .L6
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493
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494 .L7 pop ebp
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495 jmp _x86return
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496
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