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twiddle: use both src and dst value masks

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This commit is contained in:
Zack Buhman 2023-12-23 22:48:04 +08:00
parent 15839ae6ca
commit dc85cad8b0
2 changed files with 15 additions and 11 deletions
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4
example/font_outline.cpp
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@ -266,10 +266,11 @@ void main()
auto parameter = ta_parameter_writer(ta_parameter_buf);
/*
transform2(parameter,
font->texture_width, font->texture_height);
*/
/*
transform(parameter,
font->texture_width, font->texture_height,
font->first_char_code,
@ -283,7 +284,6 @@ void main()
glyphs,
cabal, 26,
font->glyph_height * 1);
*/
parameter.append<global_end_of_list>() = global_end_of_list();

8
twiddle.hpp
View File

@ -183,17 +183,21 @@ void texture3(volatile T * dst, const U * src,
constexpr uint32_t pixels_per_u = u_bits / src_bits_per_pixel;
static_assert(pixels_per_u == 1 || pixels_per_u == 2 || pixels_per_u == 4 || pixels_per_u == 8 || pixels_per_u == 16 || pixels_per_u == 32);
constexpr uint32_t src_val_mask = ((1 << src_bits_per_pixel) - 1);
constexpr uint32_t dst_val_mask = ((1 << dst_bits_per_pixel) - 1);
constexpr uint32_t dst_src_shift = (dst_bits_per_pixel < src_bits_per_pixel) ? (src_bits_per_pixel - dst_bits_per_pixel) : 0;
T dst_val = 0;
for (uint32_t curve_ix = 0; curve_ix <= curve_end_ix; curve_ix++) {
auto [x, y] = from_ix(curve_ix);
const uint32_t src_ix = y * src_stride + (x / pixels_per_u);
const uint32_t src_ix_mod = x & (pixels_per_u - 1);
const U src_val = (src[src_ix] >> (src_bits_per_pixel * src_ix_mod)) & ((1 << src_bits_per_pixel) - 1);
const U src_val = (src[src_ix] >> (src_bits_per_pixel * src_ix_mod)) & src_val_mask;
if constexpr (pixels_per_t == 1) {
dst[curve_ix] = src_val;
} else {
const uint32_t curve_ix_mod = curve_ix & (pixels_per_t - 1);
dst_val |= src_val << (dst_bits_per_pixel * curve_ix_mod);
dst_val |= ((src_val >> dst_src_shift) & dst_val_mask) << (dst_bits_per_pixel * curve_ix_mod);
if (curve_ix_mod == (pixels_per_t - 1)) {
dst[curve_ix / pixels_per_t] = dst_val;