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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/resources/resource_format.h"
#include "third_party/khronos/GLES2/gl2.h"
#include "third_party/khronos/GLES2/gl2ext.h"
namespace cc {
SkColorType ResourceFormatToSkColorType(ResourceFormat format) {
switch (format) {
case RGBA_4444:
return kARGB_4444_SkColorType;
case RGBA_8888:
case BGRA_8888:
return kN32_SkColorType;
case ETC1:
case ALPHA_8:
case LUMINANCE_8:
case RGB_565:
case RED_8:
NOTREACHED();
break;
}
NOTREACHED();
return kN32_SkColorType;
}
int BitsPerPixel(ResourceFormat format) {
switch (format) {
case BGRA_8888:
case RGBA_8888:
return 32;
case RGBA_4444:
case RGB_565:
return 16;
case ALPHA_8:
case LUMINANCE_8:
case RED_8:
return 8;
case ETC1:
return 4;
}
NOTREACHED();
return 0;
}
GLenum GLDataType(ResourceFormat format) {
DCHECK_LE(format, RESOURCE_FORMAT_MAX);
static const GLenum format_gl_data_type[] = {
GL_UNSIGNED_BYTE, // RGBA_8888
GL_UNSIGNED_SHORT_4_4_4_4, // RGBA_4444
GL_UNSIGNED_BYTE, // BGRA_8888
GL_UNSIGNED_BYTE, // ALPHA_8
GL_UNSIGNED_BYTE, // LUMINANCE_8
GL_UNSIGNED_SHORT_5_6_5, // RGB_565,
GL_UNSIGNED_BYTE, // ETC1
GL_UNSIGNED_BYTE // RED_8
};
static_assert(arraysize(format_gl_data_type) == (RESOURCE_FORMAT_MAX + 1),
"format_gl_data_type does not handle all cases.");
return format_gl_data_type[format];
}
GLenum GLDataFormat(ResourceFormat format) {
DCHECK_LE(format, RESOURCE_FORMAT_MAX);
static const GLenum format_gl_data_format[] = {
GL_RGBA, // RGBA_8888
GL_RGBA, // RGBA_4444
GL_BGRA_EXT, // BGRA_8888
GL_ALPHA, // ALPHA_8
GL_LUMINANCE, // LUMINANCE_8
GL_RGB, // RGB_565
GL_ETC1_RGB8_OES, // ETC1
GL_RED_EXT // RED_8
};
static_assert(arraysize(format_gl_data_format) == (RESOURCE_FORMAT_MAX + 1),
"format_gl_data_format does not handle all cases.");
return format_gl_data_format[format];
}
GLenum GLInternalFormat(ResourceFormat format) {
return GLDataFormat(format);
}
} // namespace cc
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