author | celestar |
Tue, 19 Jun 2007 07:21:01 +0000 | |
branch | gamebalance |
changeset 9913 | e79cd19772dd |
parent 9912 | 1ac8aac92385 |
permissions | -rw-r--r-- |
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1 |
/* $Id$ */ |
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|
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/** @file 8bpp_optimized.cpp */ |
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|
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#include "../stdafx.h" |
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#include "../zoom.hpp" |
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7 |
#include "../gfx.h" |
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8 |
#include "../debug.h" |
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9 |
#include "8bpp_optimized.hpp" |
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|
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11 |
static FBlitter_8bppOptimized iFBlitter_8bppOptimized; |
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|
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13 |
void Blitter_8bppOptimized::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) |
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14 |
{ |
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15 |
const uint8 *src, *src_next; |
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16 |
uint8 *dst, *dst_line; |
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17 |
uint offset = 0; |
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18 |
|
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19 |
/* Find the offset of this zoom-level */ |
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20 |
offset = ((const uint8 *)bp->sprite)[(int)zoom * 2] | ((const byte *)bp->sprite)[(int)zoom * 2 + 1] << 8; |
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21 |
|
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/* Find where to start reading in the source sprite */ |
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23 |
src = (const uint8 *)bp->sprite + offset; |
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24 |
dst_line = (uint8 *)bp->dst + bp->top * bp->pitch + bp->left; |
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25 |
|
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26 |
/* Skip over the top lines in the source image */ |
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27 |
for (int y = 0; y < bp->skip_top; y++) { |
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28 |
uint trans, pixels; |
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29 |
for (;;) { |
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30 |
trans = *src++; |
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31 |
pixels = *src++; |
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if (trans == 0 && pixels == 0) break; |
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33 |
src += pixels; |
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34 |
} |
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35 |
} |
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|
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37 |
src_next = src; |
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38 |
|
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39 |
for (int y = 0; y < bp->height; y++) { |
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40 |
dst = dst_line; |
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41 |
dst_line += bp->pitch; |
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42 |
|
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43 |
uint skip_left = bp->skip_left; |
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int width = bp->width; |
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|
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for (;;) { |
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src = src_next; |
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48 |
uint8 trans = *src++; |
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uint8 pixels = *src++; |
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src_next = src + pixels; |
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51 |
if (trans == 0 && pixels == 0) break; |
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52 |
if (width <= 0) continue; |
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|
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if (skip_left != 0) { |
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if (skip_left < trans) { |
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56 |
trans -= skip_left; |
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57 |
skip_left = 0; |
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} else { |
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59 |
skip_left -= trans; |
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trans = 0; |
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61 |
} |
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if (skip_left < pixels) { |
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src += skip_left; |
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pixels -= skip_left; |
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skip_left = 0; |
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} else { |
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67 |
src += pixels; |
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68 |
skip_left -= pixels; |
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pixels = 0; |
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70 |
} |
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71 |
} |
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72 |
if (skip_left != 0) continue; |
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|
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/* Skip transparent pixels */ |
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75 |
dst += trans; |
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76 |
width -= trans; |
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77 |
if (width <= 0) continue; |
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78 |
if (pixels > width) pixels = width; |
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79 |
width -= pixels; |
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80 |
|
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81 |
switch (mode) { |
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82 |
case BM_COLOUR_REMAP: |
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83 |
for (uint x = 0; x < pixels; x++) { |
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84 |
if (bp->remap[*src] != 0) *dst = bp->remap[*src]; |
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85 |
dst++; src++; |
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86 |
} |
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87 |
break; |
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88 |
|
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89 |
case BM_TRANSPARENT: |
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90 |
for (uint x = 0; x < pixels; x++) { |
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91 |
*dst = bp->remap[*dst]; |
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92 |
dst++; src++; |
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93 |
} |
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94 |
break; |
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95 |
|
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96 |
default: |
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97 |
memcpy(dst, src, pixels); |
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98 |
dst += pixels; src += pixels; |
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99 |
break; |
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100 |
} |
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101 |
} |
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102 |
} |
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103 |
} |
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104 |
|
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105 |
Sprite *Blitter_8bppOptimized::Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator) |
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106 |
{ |
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107 |
Sprite *dest_sprite; |
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108 |
byte *temp_dst; |
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109 |
uint memory = 0; |
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110 |
uint index = 0; |
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111 |
|
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112 |
/* Make memory for all zoom-levels */ |
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113 |
memory += (int)ZOOM_LVL_END * sizeof(uint16); |
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114 |
for (int i = 0; i < (int)ZOOM_LVL_END; i++) { |
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115 |
memory += UnScaleByZoom(sprite->height, (ZoomLevel)i) * UnScaleByZoom(sprite->width, (ZoomLevel)i); |
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116 |
index += 2; |
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117 |
} |
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118 |
|
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119 |
/* We have no idea how much memory we really need, so just guess something */ |
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120 |
memory *= 5; |
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121 |
temp_dst = MallocT<byte>(memory); |
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122 |
|
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123 |
/* Make the sprites per zoom-level */ |
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124 |
for (int i = 0; i < (int)ZOOM_LVL_END; i++) { |
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125 |
/* Store the scaled image */ |
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126 |
const SpriteLoader::CommonPixel *src; |
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127 |
|
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128 |
/* Store the index table */ |
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129 |
temp_dst[i * 2] = index & 0xFF; |
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130 |
temp_dst[i * 2 + 1] = (index >> 8) & 0xFF; |
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131 |
|
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132 |
byte *dst = &temp_dst[index]; |
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133 |
|
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134 |
for (int y = 0; y < UnScaleByZoom(sprite->height, (ZoomLevel)i); y++) { |
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135 |
uint trans = 0; |
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136 |
uint pixels = 0; |
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137 |
uint last_color = 0; |
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138 |
uint count_index = 0; |
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139 |
uint rx = 0; |
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140 |
src = &sprite->data[ScaleByZoom(y, (ZoomLevel)i) * sprite->width]; |
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141 |
|
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142 |
for (int x = 0; x < UnScaleByZoom(sprite->width, (ZoomLevel)i); x++) { |
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143 |
uint color = 0; |
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144 |
|
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145 |
/* Get the color keeping in mind the zoom-level */ |
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146 |
for (int j = 0; j < ScaleByZoom(1, (ZoomLevel)i); j++) { |
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147 |
if (src->m != 0) color = src->m; |
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148 |
src++; |
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149 |
rx++; |
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150 |
/* Because of the scaling it might happen we read outside the buffer. Avoid that. */ |
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151 |
if (rx == sprite->width) break; |
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152 |
} |
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153 |
|
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154 |
if (last_color == 0 || color == 0) { |
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155 |
if (count_index != 0) { |
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156 |
/* Write how many non-transparent bytes we get */ |
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157 |
temp_dst[count_index] = pixels; |
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158 |
pixels = 0; |
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159 |
count_index = 0; |
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160 |
} |
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161 |
/* As long as we find transparency bytes, keep counting */ |
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162 |
if (color == 0) { |
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163 |
last_color = 0; |
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164 |
trans++; |
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165 |
continue; |
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166 |
} |
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167 |
/* No longer transparency, so write the amount of transparent bytes */ |
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168 |
*dst = trans; |
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169 |
dst++; index++; |
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170 |
trans = 0; |
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171 |
/* Reserve a byte for the pixel counter */ |
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172 |
count_index = index; |
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173 |
dst++; index++; |
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174 |
} |
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175 |
last_color = color; |
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176 |
pixels++; |
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177 |
*dst = color; |
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178 |
dst++; index++; |
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179 |
} |
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180 |
|
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181 |
if (count_index != 0) temp_dst[count_index] = pixels; |
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182 |
|
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183 |
/* Write line-ending */ |
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184 |
*dst = 0; dst++; index++; |
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185 |
*dst = 0; dst++; index++; |
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186 |
} |
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187 |
} |
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188 |
|
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189 |
/* Safety check, to make sure we guessed the size correctly */ |
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190 |
assert(index < memory); |
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191 |
|
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192 |
/* Allocate the exact amount of memory we need */ |
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193 |
dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + index); |
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194 |
|
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195 |
dest_sprite->height = sprite->height; |
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196 |
dest_sprite->width = sprite->width; |
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197 |
dest_sprite->x_offs = sprite->x_offs; |
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198 |
dest_sprite->y_offs = sprite->y_offs; |
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199 |
memcpy(dest_sprite->data, temp_dst, index); |
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200 |
|
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201 |
return dest_sprite; |
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202 |
} |