/* $Id$ */ /** @file 8bpp_optimized.cpp Implementation of the optimized 8 bpp blitter. */ #include "../stdafx.h" #include "../zoom_func.h" #include "../core/alloc_func.hpp" #include "../core/math_func.hpp" #include "8bpp_optimized.hpp" static FBlitter_8bppOptimized iFBlitter_8bppOptimized; void Blitter_8bppOptimized::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) { /* Find the offset of this zoom-level */ const SpriteData *sprite_src = (const SpriteData *)bp->sprite; uint offset = sprite_src->offset[zoom]; /* Find where to start reading in the source sprite */ const uint8 *src = sprite_src->data + offset; uint8 *dst_line = (uint8 *)bp->dst + bp->top * bp->pitch + bp->left; /* Skip over the top lines in the source image */ for (int y = 0; y < bp->skip_top; y++) { for (;;) { uint trans = *src++; uint pixels = *src++; if (trans == 0 && pixels == 0) break; src += pixels; } } const uint8 *src_next = src; for (int y = 0; y < bp->height; y++) { uint8 *dst = dst_line; dst_line += bp->pitch; uint skip_left = bp->skip_left; int width = bp->width; for (;;) { src = src_next; uint trans = *src++; uint pixels = *src++; src_next = src + pixels; if (trans == 0 && pixels == 0) break; if (width <= 0) continue; if (skip_left != 0) { if (skip_left < trans) { trans -= skip_left; skip_left = 0; } else { skip_left -= trans; trans = 0; } if (skip_left < pixels) { src += skip_left; pixels -= skip_left; skip_left = 0; } else { src += pixels; skip_left -= pixels; pixels = 0; } } if (skip_left != 0) continue; /* Skip transparent pixels */ dst += trans; width -= trans; if (width <= 0 || pixels == 0) continue; pixels = min<uint>(pixels, (uint)width); width -= pixels; switch (mode) { case BM_COLOUR_REMAP: { const uint8 *remap = bp->remap; do { uint m = remap[*src]; if (m != 0) *dst = m; dst++; src++; } while (--pixels != 0); } break; case BM_TRANSPARENT: { const uint8 *remap = bp->remap; src += pixels; do { *dst = remap[*dst]; dst++; } while (--pixels != 0); } break; default: memcpy(dst, src, pixels); dst += pixels; src += pixels; break; } } } } Sprite *Blitter_8bppOptimized::Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator) { /* Make memory for all zoom-levels */ uint memory = sizeof(SpriteData); for (ZoomLevel i = ZOOM_LVL_BEGIN; i < ZOOM_LVL_END; i++) { memory += UnScaleByZoom(sprite->height, i) * UnScaleByZoom(sprite->width, i); } /* We have no idea how much memory we really need, so just guess something */ memory *= 5; /* Don't allocate memory each time, but just keep some * memory around as this function is called quite often * and the memory usage is quite low. */ static ReusableBuffer<byte> temp_buffer; SpriteData *temp_dst = (SpriteData *)temp_buffer.Allocate(memory); byte *dst = temp_dst->data; /* Make the sprites per zoom-level */ for (ZoomLevel i = ZOOM_LVL_BEGIN; i < ZOOM_LVL_END; i++) { /* Store the index table */ uint offset = dst - temp_dst->data; temp_dst->offset[i] = offset; /* cache values, because compiler can't cache it */ int scaled_height = UnScaleByZoom(sprite->height, i); int scaled_width = UnScaleByZoom(sprite->width, i); int scaled_1 = ScaleByZoom(1, i); for (int y = 0; y < scaled_height; y++) { uint trans = 0; uint pixels = 0; uint last_colour = 0; byte *count_dst = NULL; /* Store the scaled image */ const SpriteLoader::CommonPixel *src = &sprite->data[ScaleByZoom(y, i) * sprite->width]; const SpriteLoader::CommonPixel *src_end = &src[sprite->width]; for (int x = 0; x < scaled_width; x++) { uint colour = 0; /* Get the colour keeping in mind the zoom-level */ for (int j = 0; j < scaled_1; j++) { if (src->m != 0) colour = src->m; /* Because of the scaling it might happen we read outside the buffer. Avoid that. */ if (++src == src_end) break; } if (last_colour == 0 || colour == 0 || pixels == 255) { if (count_dst != NULL) { /* Write how many non-transparent bytes we get */ *count_dst = pixels; pixels = 0; count_dst = NULL; } /* As long as we find transparency bytes, keep counting */ if (colour == 0) { last_colour = 0; trans++; continue; } /* No longer transparency, so write the amount of transparent bytes */ *dst = trans; dst++; trans = 0; /* Reserve a byte for the pixel counter */ count_dst = dst; dst++; } last_colour = colour; pixels++; *dst = colour; dst++; } if (count_dst != NULL) *count_dst = pixels; /* Write line-ending */ *dst = 0; dst++; *dst = 0; dst++; } } uint size = dst - (byte *)temp_dst; /* Safety check, to make sure we guessed the size correctly */ assert(size < memory); /* Allocate the exact amount of memory we need */ Sprite *dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + size); dest_sprite->height = sprite->height; dest_sprite->width = sprite->width; dest_sprite->x_offs = sprite->x_offs; dest_sprite->y_offs = sprite->y_offs; memcpy(dest_sprite->data, temp_dst, size); return dest_sprite; }