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c/engine: add litert_lm_engine_settings_set_max_num_images (C API parity for #1686) #2157

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c/engine: add litert_lm_engine_settings_set_max_num_images (C API parity for #1686) #2157

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9 changes: 9 additions & 0 deletions c/engine.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -396,6 +396,15 @@ void litert_lm_engine_settings_set_max_num_tokens(
max_num_tokens);
}
}

void litert_lm_engine_settings_set_max_num_images(
LiteRtLmEngineSettings* settings, int max_num_images) {
if (settings && settings->settings && max_num_images > 0) {
settings->settings->GetMutableMainExecutorSettings().SetMaxNumImages(
max_num_images);
}
}

void litert_lm_engine_settings_set_parallel_file_section_loading(
LiteRtLmEngineSettings* settings, bool parallel_file_section_loading) {
if (settings && settings->settings) {
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12 changes: 12 additions & 0 deletions c/engine.h
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Expand Up @@ -262,6 +262,18 @@ LITERT_LM_C_API_EXPORT
void litert_lm_engine_settings_set_max_num_tokens(
LiteRtLmEngineSettings* settings, int max_num_tokens);

// Sets the maximum number of images the model can handle in a single
// session. Required for multimodal vision models (e.g. Gemma 3 Nano,
// Gemma 4) — without this set on the C API path, vision input is
// silently ignored and the model hallucinates a response from text
// alone. Mirrors `EngineConfig.maxNumImages` in the Kotlin API.
//
// @param settings The engine settings.
// @param max_num_images The maximum number of images. Must be > 0.
LITERT_LM_C_API_EXPORT
void litert_lm_engine_settings_set_max_num_images(
LiteRtLmEngineSettings* settings, int max_num_images);

// Sets whether the engine should load different sections of the litertlm file
// in parallel. Defaults to true.
//
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