1 files changed, 114 insertions, 0 deletions
diff --git a/circuitpython/shared-module/displayio/Palette.c b/circuitpython/shared-module/displayio/Palette.c
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+++ b/circuitpython/shared-module/displayio/Palette.c
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+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "shared-bindings/displayio/Palette.h"
+
+#include "shared-module/displayio/ColorConverter.h"
+
+void common_hal_displayio_palette_construct(displayio_palette_t *self, uint16_t color_count) {
+    self->color_count = color_count;
+    self->colors = (_displayio_color_t *)m_malloc(color_count * sizeof(_displayio_color_t), false);
+}
+
+void common_hal_displayio_palette_make_opaque(displayio_palette_t *self, uint32_t palette_index) {
+    self->colors[palette_index].transparent = false;
+    self->needs_refresh = true;
+}
+
+void common_hal_displayio_palette_make_transparent(displayio_palette_t *self, uint32_t palette_index) {
+    self->colors[palette_index].transparent = true;
+    self->needs_refresh = true;
+}
+
+bool common_hal_displayio_palette_is_transparent(displayio_palette_t *self, uint32_t palette_index) {
+    return self->colors[palette_index].transparent;
+}
+
+uint32_t common_hal_displayio_palette_get_len(displayio_palette_t *self) {
+    return self->color_count;
+}
+
+void common_hal_displayio_palette_set_color(displayio_palette_t *self, uint32_t palette_index, uint32_t color) {
+    if (self->colors[palette_index].rgb888 == color) {
+        return;
+    }
+    self->colors[palette_index].rgb888 = color;
+    self->colors[palette_index].luma = displayio_colorconverter_compute_luma(color);
+    self->colors[palette_index].rgb565 = displayio_colorconverter_compute_rgb565(color);
+
+    uint8_t chroma = displayio_colorconverter_compute_chroma(color);
+    self->colors[palette_index].chroma = chroma;
+    self->colors[palette_index].hue = displayio_colorconverter_compute_hue(color);
+    self->needs_refresh = true;
+}
+
+uint32_t common_hal_displayio_palette_get_color(displayio_palette_t *self, uint32_t palette_index) {
+    return self->colors[palette_index].rgb888;
+}
+
+bool displayio_palette_get_color(displayio_palette_t *self, const _displayio_colorspace_t *colorspace, uint32_t palette_index, uint32_t *color) {
+    if (palette_index > self->color_count || self->colors[palette_index].transparent) {
+        return false; // returns transparent
+    }
+
+    if (colorspace->tricolor) {
+        uint8_t luma = self->colors[palette_index].luma;
+        *color = luma >> (8 - colorspace->depth);
+        // Chroma 0 means the color is a gray and has no hue so never color based on it.
+        if (self->colors[palette_index].chroma <= 16) {
+            if (!colorspace->grayscale) {
+                *color = 0;
+            }
+            return true;
+        }
+        uint8_t pixel_hue = self->colors[palette_index].hue;
+        displayio_colorconverter_compute_tricolor(colorspace, pixel_hue, color);
+    } else if (colorspace->grayscale) {
+        size_t bitmask = (1 << colorspace->depth) - 1;
+        *color = (self->colors[palette_index].luma >> colorspace->grayscale_bit) & bitmask;
+    } else if (colorspace->depth == 16) {
+        uint16_t packed = self->colors[palette_index].rgb565;
+        if (colorspace->reverse_bytes_in_word) {
+            // swap bytes
+            packed = __builtin_bswap16(packed);
+        }
+        *color = packed;
+    } else if (colorspace->depth == 32) {
+        *color = self->colors[palette_index].rgb888;
+    } else {
+        return false;
+    }
+
+    return true;
+}
+
+bool displayio_palette_needs_refresh(displayio_palette_t *self) {
+    return self->needs_refresh;
+}
+
+void displayio_palette_finish_refresh(displayio_palette_t *self) {
+    self->needs_refresh = false;
+}