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author | smatz <smatz@openttd.org> | 2008-06-01 19:36:55 +0000 |
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committer | smatz <smatz@openttd.org> | 2008-06-01 19:36:55 +0000 |
commit | 9cf0c8c96de4877b349e05c8247dd49829dcd4f4 (patch) | |
tree | 1dd9ce206c6928c45e73a2c15bcafc8b4fda8aef /src/blitter/8bpp_optimized.cpp | |
parent | 69ebefe1aced0abd8885d4a30fa0387c0cafd5cc (diff) | |
download | openttd-9cf0c8c96de4877b349e05c8247dd49829dcd4f4.tar.xz |
(svn r13354) -Codechange: make 8bpp_optimized blitter ~25% faster in encoding and ~15% faster in drawing (depends on architecture)
Diffstat (limited to 'src/blitter/8bpp_optimized.cpp')
-rw-r--r-- | src/blitter/8bpp_optimized.cpp | 109 |
1 files changed, 52 insertions, 57 deletions
diff --git a/src/blitter/8bpp_optimized.cpp b/src/blitter/8bpp_optimized.cpp index a230b6015..05e4bf257 100644 --- a/src/blitter/8bpp_optimized.cpp +++ b/src/blitter/8bpp_optimized.cpp @@ -6,38 +6,34 @@ #include "../zoom_func.h" #include "../debug.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) { - const uint8 *src, *src_next; - uint8 *dst, *dst_line; - uint offset = 0; - /* Find the offset of this zoom-level */ - offset = ((const uint8 *)bp->sprite)[(int)(zoom - ZOOM_LVL_BEGIN) * 2] | ((const byte *)bp->sprite)[(int)(zoom - ZOOM_LVL_BEGIN) * 2 + 1] << 8; + uint offset = ((const uint8 *)bp->sprite)[(int)(zoom - ZOOM_LVL_BEGIN) * 2] | ((const byte *)bp->sprite)[(int)(zoom - ZOOM_LVL_BEGIN) * 2 + 1] << 8; /* Find where to start reading in the source sprite */ - src = (const uint8 *)bp->sprite + offset; - dst_line = (uint8 *)bp->dst + bp->top * bp->pitch + bp->left; + const uint8 *src = (const uint8 *)bp->sprite + 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++) { - uint trans, pixels; for (;;) { - trans = *src++; - pixels = *src++; + uint trans = *src++; + uint pixels = *src++; if (trans == 0 && pixels == 0) break; src += pixels; } } - src_next = src; + const uint8 *src_next = src; for (int y = 0; y < bp->height; y++) { - dst = dst_line; + uint8 *dst = dst_line; dst_line += bp->pitch; uint skip_left = bp->skip_left; @@ -45,8 +41,8 @@ void Blitter_8bppOptimized::Draw(Blitter::BlitterParams *bp, BlitterMode mode, Z for (;;) { src = src_next; - uint8 trans = *src++; - uint8 pixels = *src++; + uint trans = *src++; + uint pixels = *src++; src_next = src + pixels; if (trans == 0 && pixels == 0) break; if (width <= 0) continue; @@ -75,7 +71,7 @@ void Blitter_8bppOptimized::Draw(Blitter::BlitterParams *bp, BlitterMode mode, Z dst += trans; width -= trans; if (width <= 0) continue; - if (pixels > width) pixels = width; + pixels = min<uint>(pixels, (uint)width); width -= pixels; switch (mode) { @@ -104,99 +100,98 @@ void Blitter_8bppOptimized::Draw(Blitter::BlitterParams *bp, BlitterMode mode, Z Sprite *Blitter_8bppOptimized::Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator) { - Sprite *dest_sprite; - byte *temp_dst; - uint memory = 0; - uint index = 0; - /* Make memory for all zoom-levels */ - memory += (int)(ZOOM_LVL_END - ZOOM_LVL_BEGIN) * sizeof(uint16); + uint memory = (int)(ZOOM_LVL_END - ZOOM_LVL_BEGIN) * sizeof(uint16); + for (ZoomLevel i = ZOOM_LVL_BEGIN; i < ZOOM_LVL_END; i++) { memory += UnScaleByZoom(sprite->height, i) * UnScaleByZoom(sprite->width, i); - index += 2; } /* We have no idea how much memory we really need, so just guess something */ memory *= 5; - temp_dst = MallocT<byte>(memory); + byte *temp_dst = MallocT<byte>(memory); + byte *dst = &temp_dst[(ZOOM_LVL_END - ZOOM_LVL_BEGIN) * 2]; /* Make the sprites per zoom-level */ for (ZoomLevel i = ZOOM_LVL_BEGIN; i < ZOOM_LVL_END; i++) { - /* Store the scaled image */ - const SpriteLoader::CommonPixel *src; - /* Store the index table */ + uint index = dst - temp_dst; temp_dst[i * 2] = index & 0xFF; temp_dst[i * 2 + 1] = (index >> 8) & 0xFF; - byte *dst = &temp_dst[index]; + /* 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 < UnScaleByZoom(sprite->height, i); y++) { + for (int y = 0; y < scaled_height; y++) { uint trans = 0; uint pixels = 0; - uint last_color = 0; - uint count_index = 0; - uint rx = 0; - src = &sprite->data[ScaleByZoom(y, i) * sprite->width]; + 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 < UnScaleByZoom(sprite->width, i); x++) { - uint color = 0; + for (int x = 0; x < scaled_width; x++) { + uint colour = 0; /* Get the color keeping in mind the zoom-level */ - for (int j = 0; j < ScaleByZoom(1, i); j++) { - if (src->m != 0) color = src->m; - src++; - rx++; + 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 (rx == sprite->width) break; + if (++src == src_end) break; } - if (last_color == 0 || color == 0 || pixels == 255) { - if (count_index != 0) { + if (last_colour == 0 || colour == 0 || pixels == 255) { + if (count_dst != NULL) { /* Write how many non-transparent bytes we get */ - temp_dst[count_index] = pixels; + *count_dst = pixels; pixels = 0; - count_index = 0; + count_dst = NULL; } /* As long as we find transparency bytes, keep counting */ - if (color == 0) { - last_color = 0; + if (colour == 0) { + last_colour = 0; trans++; continue; } /* No longer transparency, so write the amount of transparent bytes */ *dst = trans; - dst++; index++; + dst++; trans = 0; /* Reserve a byte for the pixel counter */ - count_index = index; - dst++; index++; + count_dst = dst; + dst++; } - last_color = color; + last_colour = colour; pixels++; - *dst = color; - dst++; index++; + *dst = colour; + dst++; } - if (count_index != 0) temp_dst[count_index] = pixels; + if (count_dst != NULL) *count_dst = pixels; /* Write line-ending */ - *dst = 0; dst++; index++; - *dst = 0; dst++; index++; + *dst = 0; dst++; + *dst = 0; dst++; } } + uint size = dst - temp_dst; + /* Safety check, to make sure we guessed the size correctly */ - assert(index < memory); + assert(size < memory); /* Allocate the exact amount of memory we need */ - dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + index); + 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, index); + memcpy(dest_sprite->data, temp_dst, size); free(temp_dst); return dest_sprite; |