Implement Tulip Creative Computer 4r11 (#608)

Drivers/rgb-display-module/source/software_pixel_mapper.cpp

@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: Apache-2.0
+#include <soc/soc_caps.h>
+#if SOC_LCD_RGB_SUPPORTED
+
+#include <drivers/software_pixel_mapper.h>
+
+#include <esp_heap_caps.h>
+
+// RGB332 packs each pixel into one byte: 3 bits red, 3 bits green, 2 bits blue. The byte layout
+// maps straight onto an 8-data-line panel's significant color inputs (R7..R5, G7..G5, B7..B6),
+// so each RGB565 channel's top bits land on the corresponding MSB lines
+static void rgb332_map(SoftwarePixelMapperData data, const uint16_t* src, uint8_t* dst, uint32_t pixel_count) {
+    (void)data;
+    for (uint32_t i = 0; i < pixel_count; i++) {
+        uint16_t px = src[i];
+        dst[i] = (uint8_t)(((px >> 13) & 0x07) << 5) | (((px >> 8) & 0x07) << 2) | ((px >> 3) & 0x03);
+    }
+}
+
+// The destination buffer must hold a whole frame (1 byte/pixel for RGB332). A 1024x600 panel
+// needs ~600KB, which only fits in PSRAM on most boards, prefer SPIRAM and fall back to whatever
+// internal RAM is available. The returned handle is this buffer, passed back as map()'s dst.
+static SoftwarePixelMapperData rgb332_create(uint16_t width, uint16_t height) {
+    size_t buffer_size = (size_t)width * height;
+    void* buffer = heap_caps_malloc(buffer_size, MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT);
+    if (buffer == nullptr) {
+        buffer = heap_caps_malloc(buffer_size, MALLOC_CAP_DEFAULT);
+    }
+    return buffer;
+}
+
+static void rgb332_destroy(SoftwarePixelMapperData data) {
+    heap_caps_free(data);
+}
+
+const struct SoftwarePixelMapper software_pixel_mapper_rgb332 = {
+    .create = rgb332_create,
+    .map = rgb332_map,
+    .destroy = rgb332_destroy,
+};
+
+#endif // SOC_LCD_RGB_SUPPORTED