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Implement custom resampling command line args

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This change implements -resample X Y command line support in addition to
-resample_factor, when a more sophisticated algorithm is needed to
compute the desired image size.

For example, these can be used to round the image to a multiple of 4 or
to a power of 2 for improved compatibility with various graphics APIs.
This commit is contained in:
Arseny Kapoulkine
2021-04-14 21:13:19 -07:00
parent 24ba5ded22
commit 0eb541a118
3 changed files with 29 additions and 1 deletions
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8
basisu_tool.cpp
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@@ -127,6 +127,7 @@ static void print_usage()
" -disable_hierarchical_endpoint_codebooks: Disable hierarchical endpoint codebook usage, slower but higher quality on some compression levels\n"
" -compare_ssim: Compute and display SSIM of image comparison (slow)\n"
" -bench: UASTC benchmark mode, for development only\n"
" -resample X Y: Resample all input textures to XxY pixels using a box filter\n"
" -resample_factor X: Resample all input textures by scale factor X using a box filter\n"
" -no_sse: Forbid all SSE instruction set usage\n"
" -validate_etc1s: Validate internal ETC1S compressor's data structures during compression (slower, intended for development).\n"
@@ -392,6 +393,13 @@ public:
arg_count++;
}
else if (strcasecmp(pArg, "-resample") == 0)
{
REMAINING_ARGS_CHECK(2);
m_comp_params.m_resample_width = atoi(arg_v[arg_index + 1]);
m_comp_params.m_resample_height = atoi(arg_v[arg_index + 2]);
arg_count += 2;
}
else if (strcasecmp(pArg, "-resample_factor") == 0)
{
REMAINING_ARGS_CHECK(1);

16
encoder/basisu_comp.cpp
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@@ -145,6 +145,8 @@ namespace basisu
PRINT_BOOL_VALUE(m_rdo_uastc_favor_simpler_modes_in_rdo_mode)
PRINT_BOOL_VALUE(m_rdo_uastc_multithreading);
PRINT_INT_VALUE(m_resample_width);
PRINT_INT_VALUE(m_resample_height);
PRINT_FLOAT_VALUE(m_resample_factor);
debug_printf("Has global codebooks: %u\n", m_params.m_pGlobal_codebooks ? 1 : 0);
if (m_params.m_pGlobal_codebooks)
@@ -541,7 +543,19 @@ namespace basisu
file_image.resize(64, 64);
#endif
if (m_params.m_resample_factor > 0.0f)
if (m_params.m_resample_width > 0 && m_params.m_resample_height > 0)
{
int new_width = basisu::minimum<int>(m_params.m_resample_width, BASISU_MAX_SUPPORTED_TEXTURE_DIMENSION);
int new_height = basisu::minimum<int>(m_params.m_resample_height, BASISU_MAX_SUPPORTED_TEXTURE_DIMENSION);
debug_printf("Resampling to %ix%i\n", new_width, new_height);
// TODO: A box filter - kaiser looks too sharp on video. Let the caller control this.
image temp_img(new_width, new_height);
image_resample(file_image, temp_img, m_params.m_perceptual, "box"); // "kaiser");
temp_img.swap(file_image);
}
else if (m_params.m_resample_factor > 0.0f)
{
int new_width = basisu::minimum<int>(basisu::maximum(1, (int)ceilf(file_image.get_width() * m_params.m_resample_factor)), BASISU_MAX_SUPPORTED_TEXTURE_DIMENSION);
int new_height = basisu::minimum<int>(basisu::maximum(1, (int)ceilf(file_image.get_height() * m_params.m_resample_factor)), BASISU_MAX_SUPPORTED_TEXTURE_DIMENSION);

6
encoder/basisu_comp.h
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@@ -222,6 +222,8 @@ namespace basisu
m_rdo_uastc_smooth_block_max_std_dev(UASTC_RDO_DEFAULT_MAX_SMOOTH_BLOCK_STD_DEV, .01f, 65536.0f),
m_rdo_uastc_max_allowed_rms_increase_ratio(UASTC_RDO_DEFAULT_MAX_ALLOWED_RMS_INCREASE_RATIO, .01f, 100.0f),
m_rdo_uastc_skip_block_rms_thresh(UASTC_RDO_DEFAULT_SKIP_BLOCK_RMS_THRESH, .01f, 100.0f),
m_resample_width(0, 1, 16384),
m_resample_height(0, 1, 16384),
m_resample_factor(0.0f, .00125f, 100.0f),
m_ktx2_uastc_supercompression(basist::KTX2_SS_NONE),
m_ktx2_zstd_supercompression_level(6, INT_MIN, INT_MAX),
@@ -305,6 +307,8 @@ namespace basisu
m_rdo_uastc_favor_simpler_modes_in_rdo_mode.clear();
m_rdo_uastc_multithreading.clear();
m_resample_width.clear();
m_resample_height.clear();
m_resample_factor.clear();
m_pGlobal_codebooks = nullptr;
@@ -437,6 +441,8 @@ namespace basisu
bool_param<true> m_rdo_uastc_favor_simpler_modes_in_rdo_mode;
bool_param<true> m_rdo_uastc_multithreading;
param<int> m_resample_width;
param<int> m_resample_height;
param<float> m_resample_factor;
const basist::basisu_lowlevel_etc1s_transcoder *m_pGlobal_codebooks;