[PATCH v4 2/2] gdi32: Use a lazy-init lookup cache when converting RGB values to colour table indices.
From: Gabriel Ivăncescu <gabrielopcode(a)gmail.com> Signed-off-by: Gabriel Ivăncescu <gabrielopcode(a)gmail.com> Signed-off-by: Huw Davies <huw(a)codeweavers.com> --- dlls/gdi32/dibdrv/primitives.c | 57 ++++++++++++++++++++++++++-------- 1 file changed, 44 insertions(+), 13 deletions(-) diff --git a/dlls/gdi32/dibdrv/primitives.c b/dlls/gdi32/dibdrv/primitives.c index 31a9259e5f2..e4b18a6656d 100644 --- a/dlls/gdi32/dibdrv/primitives.c +++ b/dlls/gdi32/dibdrv/primitives.c @@ -3503,16 +3503,40 @@ static inline BOOL color_tables_match(const dib_info *d1, const dib_info *d2) return !memcmp(d1->color_table, d2->color_table, (1 << d1->bit_count) * sizeof(d1->color_table[0])); } -static inline DWORD rgb_lookup_colortable(const dib_info *dst, BYTE r, BYTE g, BYTE b) +/* + * To translate an RGB value into a colour table index Windows uses the 5 msbs of each component. + * We thus create a lookup table with 32^3 entries. + */ +struct rgb_lookup_colortable_ctx +{ + const dib_info *dib; + BYTE map[32 * 32 * 32]; + BYTE valid[32 * 32 * 32 / 8]; +}; + +static void rgb_lookup_colortable_init(const dib_info *dib, struct rgb_lookup_colortable_ctx *ctx) { - /* Windows reduces precision to 5 bits, probably in order to build some sort of lookup cache */ - return rgb_to_pixel_colortable( dst, (r & ~7) + 4, (g & ~7) + 4, (b & ~7) + 4 ); + ctx->dib = dib; + memset(ctx->valid, 0, sizeof(ctx->valid)); +} + +static inline BYTE rgb_lookup_colortable(struct rgb_lookup_colortable_ctx *ctx, DWORD r, DWORD g, DWORD b) +{ + DWORD pos = ((r & 0xf8) >> 3) | ((g & 0xf8) << 2) | ((b & 0xf8) << 7); + + if (!(ctx->valid[pos / 8] & pixel_masks_1[pos & 7])) + { + ctx->valid[pos / 8] |= pixel_masks_1[pos & 7]; + ctx->map[pos] = rgb_to_pixel_colortable(ctx->dib, (r & 0xf8) | 4, (g & 0xf8) | 4, (b & 0xf8) | 4); + } + return ctx->map[pos]; } static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rect, BOOL dither) { BYTE *dst_start = get_pixel_ptr_8(dst, 0, 0), *dst_pixel; INT x, y, pad_size = ((dst->width + 3) & ~3) - (src_rect->right - src_rect->left); + struct rgb_lookup_colortable_ctx lookup_ctx; DWORD src_val; switch(src->bit_count) @@ -3521,6 +3545,7 @@ static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rec { DWORD *src_start = get_pixel_ptr_32(src, src_rect->left, src_rect->top), *src_pixel; + rgb_lookup_colortable_init(dst, &lookup_ctx); if(src->funcs == &funcs_8888) { for(y = src_rect->top; y < src_rect->bottom; y++) @@ -3530,7 +3555,7 @@ static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rec for(x = src_rect->left; x < src_rect->right; x++) { src_val = *src_pixel++; - *dst_pixel++ = rgb_lookup_colortable(dst, src_val >> 16, src_val >> 8, src_val ); + *dst_pixel++ = rgb_lookup_colortable(&lookup_ctx, src_val >> 16, src_val >> 8, src_val ); } if(pad_size) memset(dst_pixel, 0, pad_size); dst_start += dst->stride; @@ -3546,7 +3571,7 @@ static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rec for(x = src_rect->left; x < src_rect->right; x++) { src_val = *src_pixel++; - *dst_pixel++ = rgb_lookup_colortable(dst, + *dst_pixel++ = rgb_lookup_colortable(&lookup_ctx, src_val >> src->red_shift, src_val >> src->green_shift, src_val >> src->blue_shift ); @@ -3565,7 +3590,7 @@ static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rec for(x = src_rect->left; x < src_rect->right; x++) { src_val = *src_pixel++; - *dst_pixel++ = rgb_lookup_colortable(dst, + *dst_pixel++ = rgb_lookup_colortable(&lookup_ctx, get_field(src_val, src->red_shift, src->red_len), get_field(src_val, src->green_shift, src->green_len), get_field(src_val, src->blue_shift, src->blue_len)); @@ -3582,13 +3607,14 @@ static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rec { BYTE *src_start = get_pixel_ptr_24(src, src_rect->left, src_rect->top), *src_pixel; + rgb_lookup_colortable_init(dst, &lookup_ctx); for(y = src_rect->top; y < src_rect->bottom; y++) { dst_pixel = dst_start; src_pixel = src_start; for(x = src_rect->left; x < src_rect->right; x++, src_pixel += 3) { - *dst_pixel++ = rgb_lookup_colortable(dst, src_pixel[2], src_pixel[1], src_pixel[0] ); + *dst_pixel++ = rgb_lookup_colortable(&lookup_ctx, src_pixel[2], src_pixel[1], src_pixel[0] ); } if(pad_size) memset(dst_pixel, 0, pad_size); dst_start += dst->stride; @@ -3600,6 +3626,7 @@ static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rec case 16: { WORD *src_start = get_pixel_ptr_16(src, src_rect->left, src_rect->top), *src_pixel; + rgb_lookup_colortable_init(dst, &lookup_ctx); if(src->funcs == &funcs_555) { for(y = src_rect->top; y < src_rect->bottom; y++) @@ -3609,7 +3636,7 @@ static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rec for(x = src_rect->left; x < src_rect->right; x++) { src_val = *src_pixel++; - *dst_pixel++ = rgb_lookup_colortable(dst, + *dst_pixel++ = rgb_lookup_colortable(&lookup_ctx, ((src_val >> 7) & 0xf8) | ((src_val >> 12) & 0x07), ((src_val >> 2) & 0xf8) | ((src_val >> 7) & 0x07), ((src_val << 3) & 0xf8) | ((src_val >> 2) & 0x07) ); @@ -3628,7 +3655,7 @@ static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rec for(x = src_rect->left; x < src_rect->right; x++) { src_val = *src_pixel++; - *dst_pixel++ = rgb_lookup_colortable(dst, + *dst_pixel++ = rgb_lookup_colortable(&lookup_ctx, (((src_val >> src->red_shift) << 3) & 0xf8) | (((src_val >> src->red_shift) >> 2) & 0x07), (((src_val >> src->green_shift) << 3) & 0xf8) | @@ -3650,7 +3677,7 @@ static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rec for(x = src_rect->left; x < src_rect->right; x++) { src_val = *src_pixel++; - *dst_pixel++ = rgb_lookup_colortable(dst, + *dst_pixel++ = rgb_lookup_colortable(&lookup_ctx, (((src_val >> src->red_shift) << 3) & 0xf8) | (((src_val >> src->red_shift) >> 2) & 0x07), (((src_val >> src->green_shift) << 2) & 0xfc) | @@ -3672,7 +3699,7 @@ static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rec for(x = src_rect->left; x < src_rect->right; x++) { src_val = *src_pixel++; - *dst_pixel++ = rgb_lookup_colortable(dst, + *dst_pixel++ = rgb_lookup_colortable(&lookup_ctx, get_field(src_val, src->red_shift, src->red_len), get_field(src_val, src->green_shift, src->green_len), get_field(src_val, src->blue_shift, src->blue_len)); @@ -4802,8 +4829,10 @@ static void blend_rects_8(const dib_info *dst, int num, const RECT *rc, const dib_info *src, const POINT *offset, BLENDFUNCTION blend) { const RGBQUAD *color_table = get_dib_color_table( dst ); + struct rgb_lookup_colortable_ctx lookup_ctx; int i, x, y; + rgb_lookup_colortable_init( dst, &lookup_ctx ); for (i = 0; i < num; i++, rc++) { DWORD *src_ptr = get_pixel_ptr_32( src, rc->left + offset->x, rc->top + offset->y ); @@ -4815,7 +4844,7 @@ static void blend_rects_8(const dib_info *dst, int num, const RECT *rc, { RGBQUAD rgb = color_table[dst_ptr[x]]; DWORD val = blend_rgb( rgb.rgbRed, rgb.rgbGreen, rgb.rgbBlue, src_ptr[x], blend ); - dst_ptr[x] = rgb_lookup_colortable( dst, val >> 16, val >> 8, val ); + dst_ptr[x] = rgb_lookup_colortable( &lookup_ctx, val >> 16, val >> 8, val ); } } } @@ -4825,8 +4854,10 @@ static void blend_rects_4(const dib_info *dst, int num, const RECT *rc, const dib_info *src, const POINT *offset, BLENDFUNCTION blend) { const RGBQUAD *color_table = get_dib_color_table( dst ); + struct rgb_lookup_colortable_ctx lookup_ctx; int i, j, x, y; + rgb_lookup_colortable_init( dst, &lookup_ctx ); for (i = 0; i < num; i++, rc++) { DWORD *src_ptr = get_pixel_ptr_32( src, rc->left + offset->x, rc->top + offset->y ); @@ -4839,7 +4870,7 @@ static void blend_rects_4(const dib_info *dst, int num, const RECT *rc, DWORD val = ((x & 1) ? dst_ptr[x / 2] : (dst_ptr[x / 2] >> 4)) & 0x0f; RGBQUAD rgb = color_table[val]; val = blend_rgb( rgb.rgbRed, rgb.rgbGreen, rgb.rgbBlue, src_ptr[j], blend ); - val = rgb_lookup_colortable( dst, val >> 16, val >> 8, val ); + val = rgb_lookup_colortable( &lookup_ctx, val >> 16, val >> 8, val ); if (x & 1) dst_ptr[x / 2] = val | (dst_ptr[x / 2] & 0xf0); else -- 2.23.0
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Huw Davies