8bpp_optimized.cpp
Go to the documentation of this file.00001
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00012 #include "../stdafx.h"
00013 #include "../zoom_func.h"
00014 #include "../core/math_func.hpp"
00015 #include "8bpp_optimized.hpp"
00016
00017 static FBlitter_8bppOptimized iFBlitter_8bppOptimized;
00018
00019 void Blitter_8bppOptimized::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
00020 {
00021
00022 const SpriteData *sprite_src = (const SpriteData *)bp->sprite;
00023 uint offset = sprite_src->offset[zoom];
00024
00025
00026 const uint8 *src = sprite_src->data + offset;
00027 uint8 *dst_line = (uint8 *)bp->dst + bp->top * bp->pitch + bp->left;
00028
00029
00030 for (int y = 0; y < bp->skip_top; y++) {
00031 for (;;) {
00032 uint trans = *src++;
00033 uint pixels = *src++;
00034 if (trans == 0 && pixels == 0) break;
00035 src += pixels;
00036 }
00037 }
00038
00039 const uint8 *src_next = src;
00040
00041 for (int y = 0; y < bp->height; y++) {
00042 uint8 *dst = dst_line;
00043 dst_line += bp->pitch;
00044
00045 uint skip_left = bp->skip_left;
00046 int width = bp->width;
00047
00048 for (;;) {
00049 src = src_next;
00050 uint trans = *src++;
00051 uint pixels = *src++;
00052 src_next = src + pixels;
00053 if (trans == 0 && pixels == 0) break;
00054 if (width <= 0) continue;
00055
00056 if (skip_left != 0) {
00057 if (skip_left < trans) {
00058 trans -= skip_left;
00059 skip_left = 0;
00060 } else {
00061 skip_left -= trans;
00062 trans = 0;
00063 }
00064 if (skip_left < pixels) {
00065 src += skip_left;
00066 pixels -= skip_left;
00067 skip_left = 0;
00068 } else {
00069 src += pixels;
00070 skip_left -= pixels;
00071 pixels = 0;
00072 }
00073 }
00074 if (skip_left != 0) continue;
00075
00076
00077 dst += trans;
00078 width -= trans;
00079 if (width <= 0 || pixels == 0) continue;
00080 pixels = min<uint>(pixels, (uint)width);
00081 width -= pixels;
00082
00083 switch (mode) {
00084 case BM_COLOUR_REMAP: {
00085 const uint8 *remap = bp->remap;
00086 do {
00087 uint m = remap[*src];
00088 if (m != 0) *dst = m;
00089 dst++; src++;
00090 } while (--pixels != 0);
00091 } break;
00092
00093 case BM_TRANSPARENT: {
00094 const uint8 *remap = bp->remap;
00095 src += pixels;
00096 do {
00097 *dst = remap[*dst];
00098 dst++;
00099 } while (--pixels != 0);
00100 } break;
00101
00102 default:
00103 memcpy(dst, src, pixels);
00104 dst += pixels; src += pixels;
00105 break;
00106 }
00107 }
00108 }
00109 }
00110
00111 Sprite *Blitter_8bppOptimized::Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator)
00112 {
00113
00114 uint memory = sizeof(SpriteData);
00115
00116 for (ZoomLevel i = ZOOM_LVL_BEGIN; i < ZOOM_LVL_END; i++) {
00117 memory += UnScaleByZoom(sprite->height, i) * UnScaleByZoom(sprite->width, i);
00118 }
00119
00120
00121 memory *= 5;
00122
00123
00124
00125
00126 static ReusableBuffer<byte> temp_buffer;
00127 SpriteData *temp_dst = (SpriteData *)temp_buffer.Allocate(memory);
00128 byte *dst = temp_dst->data;
00129
00130
00131 for (ZoomLevel i = ZOOM_LVL_BEGIN; i < ZOOM_LVL_END; i++) {
00132
00133 uint offset = dst - temp_dst->data;
00134 temp_dst->offset[i] = offset;
00135
00136
00137 int scaled_height = UnScaleByZoom(sprite->height, i);
00138 int scaled_width = UnScaleByZoom(sprite->width, i);
00139 int scaled_1 = ScaleByZoom(1, i);
00140
00141 for (int y = 0; y < scaled_height; y++) {
00142 uint trans = 0;
00143 uint pixels = 0;
00144 uint last_colour = 0;
00145 byte *count_dst = NULL;
00146
00147
00148 const SpriteLoader::CommonPixel *src = &sprite->data[ScaleByZoom(y, i) * sprite->width];
00149 const SpriteLoader::CommonPixel *src_end = &src[sprite->width];
00150
00151 for (int x = 0; x < scaled_width; x++) {
00152 uint colour = 0;
00153
00154
00155 for (int j = 0; j < scaled_1; j++) {
00156 if (src->m != 0) colour = src->m;
00157
00158 if (++src == src_end) break;
00159 }
00160
00161 if (last_colour == 0 || colour == 0 || pixels == 255) {
00162 if (count_dst != NULL) {
00163
00164 *count_dst = pixels;
00165 pixels = 0;
00166 count_dst = NULL;
00167 }
00168
00169 if (colour == 0) {
00170 last_colour = 0;
00171 trans++;
00172 continue;
00173 }
00174
00175 *dst = trans;
00176 dst++;
00177 trans = 0;
00178
00179 count_dst = dst;
00180 dst++;
00181 }
00182 last_colour = colour;
00183 pixels++;
00184 *dst = colour;
00185 dst++;
00186 }
00187
00188 if (count_dst != NULL) *count_dst = pixels;
00189
00190
00191 *dst = 0; dst++;
00192 *dst = 0; dst++;
00193 }
00194 }
00195
00196 uint size = dst - (byte *)temp_dst;
00197
00198
00199 assert(size < memory);
00200
00201
00202 Sprite *dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + size);
00203
00204 dest_sprite->height = sprite->height;
00205 dest_sprite->width = sprite->width;
00206 dest_sprite->x_offs = sprite->x_offs;
00207 dest_sprite->y_offs = sprite->y_offs;
00208 memcpy(dest_sprite->data, temp_dst, size);
00209
00210 return dest_sprite;
00211 }