system/dev/display/intel-i915/tiling.h

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#pragma once

#include <assert.h>
#include <ddk/protocol/intel-gpu-core.h>
#include <fbl/algorithm.h>
#include <inttypes.h>
#include <zircon/pixelformat.h>
#include <zircon/device/display-controller.h>

namespace i915 {

static inline uint32_t get_tile_byte_width(uint32_t tiling, zx_pixel_format_t format) {
    switch (tiling) {
    case IMAGE_TYPE_SIMPLE: return 64;
    case IMAGE_TYPE_X_TILED: return 512;
    case IMAGE_TYPE_Y_LEGACY_TILED: return 128;
    case IMAGE_TYPE_YF_TILED: return ZX_PIXEL_FORMAT_BYTES(format) == 1 ? 64 : 128;
    default:
        assert(false);
        return 0;
    }
}

static inline uint32_t get_tile_byte_size(uint32_t tiling) {
    return tiling == IMAGE_TYPE_SIMPLE ? 64 : 4096;
}

static inline uint32_t get_tile_px_height(uint32_t tiling, zx_pixel_format_t format) {
    return get_tile_byte_size(tiling) / get_tile_byte_width(tiling, format);
}

static inline uint32_t width_in_tiles(uint32_t tiling, uint32_t width,
                                      zx_pixel_format_t format) {
    uint32_t tile_width = get_tile_byte_width(tiling, format);
    return ((width * ZX_PIXEL_FORMAT_BYTES(format))+ tile_width - 1) / tile_width;
}

static inline uint32_t height_in_tiles(uint32_t tiling, uint32_t height,
                                       zx_pixel_format_t format) {
    uint32_t tile_height = get_tile_px_height(tiling, format);
    return (height + tile_height - 1) / tile_height;
}

} // namespace i915