skia2/docs/illustrations.bmh

#Topic Illustrations

#Subtopic Image_Info_Color_Type_RGB_565
#Example
#Width 415
#Height 250
void draw(SkCanvas* canvas) {
    canvas->scale(1.25f, 1.25f);
    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setTextSize(10);
    paint.setTextAlign(SkPaint::kCenter_Align);
    canvas->drawString("16-bit word", 5 + 20 * 8, 20, paint);
    canvas->drawString("little endian byte order", 5 + 20 * 4, 85, paint);
    canvas->drawString("(low bits)", 5 + 20 * 1.5f, 137, paint);
    canvas->drawString("(high bits)", 5 + 20 * 6.5f, 187, paint);
    auto drawBoxText = [=](SkScalar e[], const char* s[], int count, int n, SkScalar yPos) -> void {
        SkPaint p(paint);
        p.setColor(SK_ColorRED);
        SkScalar xPos = 15;
        int width = n % 32 + 1;
        int lastN = n > 32 ? 32 : 0;
        for (; n >= lastN; --n) {
            for (int i = 0; i <= count; ++i) {
                int a = width - e[i];
                if (a == n || a == n + 1 || a == n - 32 || a == n - 31) {
                    char num[3] = {(char) ('0' + n / 10), (char) ('0' + n % 10), '\0'};
                    canvas->drawString(n >= 10 ? num : &num[1], xPos, yPos - 5, p);
                    break;
                }
            }
            xPos += 20;
        }
        p.setColor(SK_ColorBLACK);
        for (int i = 0; i < count; ++i) {
            canvas->drawString(s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p);
        }
        p.setStyle(SkPaint::kStroke_Style);
        for (int i = 0; i <= count; ++i) {
            canvas->drawLine(5 + e[i] * 20, yPos, 5 + e[i] * 20, yPos + 15, p);
        }
        for (int i = 0; i < 2; ++i) {
            canvas->drawLine(5 + e[0] * 20, yPos + i * 15, 5 + e[count] * 20, yPos + i * 15, p);
        }
    };
    SkScalar edges[] = { 0, 5, 11, 16,
                         0, 3, 8,
                         0, 5, 8 };
    const char* labels[] = { "red", "green", "blue" };
    drawBoxText(&edges[0], &labels[0], 3, 15, 45);
    drawBoxText(&edges[4], &labels[1], 2, 7, 110);
    drawBoxText(&edges[7], &labels[0], 2, 7, 160);
}
##
##

#Subtopic Image_Info_Color_Type_ARGB_4444
#Example
#Width 415
#Height 250
void draw(SkCanvas* canvas) {
    canvas->scale(1.25f, 1.25f);
    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setTextSize(10);
    paint.setTextAlign(SkPaint::kCenter_Align);
    canvas->drawString("16-bit word", 5 + 20 * 8, 20, paint);
    canvas->drawString("little endian byte order", 5 + 20 * 4, 85, paint);
    auto drawBoxText = [=](SkScalar e[], const char* s[], int count, int n, SkScalar yPos) -> void {
        SkPaint p(paint);
        p.setColor(SK_ColorRED);
        SkScalar xPos = 15;
        int width = n % 32 + 1;
        int lastN = n > 32 ? 32 : 0;
        for (; n >= lastN; --n) {
            for (int i = 0; i <= count; ++i) {
                int a = width - e[i];
                if (a == n || a == n + 1 || a == n - 32 || a == n - 31) {
                    char num[3] = {(char) ('0' + n / 10), (char) ('0' + n % 10), '\0'};
                    canvas->drawString(n >= 10 ? num : &num[1], xPos, yPos - 5, p);
                    break;
                }
            }
            xPos += 20;
        }
        p.setColor(SK_ColorBLACK);
        for (int i = 0; i < count; ++i) {
            canvas->drawString(s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p);
        }
        p.setStyle(SkPaint::kStroke_Style);
        for (int i = 0; i <= count; ++i) {
            canvas->drawLine(5 + e[i] * 20, yPos, 5 + e[i] * 20, yPos + 15, p);
        }
        for (int i = 0; i < 2; ++i) {
            canvas->drawLine(5 + e[0] * 20, yPos + i * 15, 5 + e[count] * 20, yPos + i * 15, p);
        }
    };
    SkScalar edges[] = { 0, 4, 8, 12, 16 };
    const char* labels[] = { "red", "green", "blue", "alpha" };
    drawBoxText(&edges[0], &labels[0], 4, 15, 45);
    drawBoxText(&edges[0], &labels[2], 2, 7, 110);
    drawBoxText(&edges[0], &labels[0], 2, 7, 160);
}
##
##

#Subtopic Image_Info_Color_Type_RGBA_8888
#Example
#Width 812
#Height 365
void draw(SkCanvas* canvas) {
    canvas->scale(1.25f, 1.25f);
    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setTextSize(10);
    paint.setTextAlign(SkPaint::kCenter_Align);
    canvas->drawString("32-bit word", 5 + 20 * 16, 20, paint);
    canvas->drawString("little endian byte order", 5 + 20 * 4, 85, paint);
    auto drawBoxText = [=](SkScalar e[], const char* s[], int count, int n, SkScalar yPos) -> void {
        SkPaint p(paint);
        p.setColor(SK_ColorRED);
        SkScalar xPos = 15;
        int width = n % 32 + 1;
        int lastN = n > 32 ? 32 : 0;
        for (; n >= lastN; --n) {
            for (int i = 0; i <= count; ++i) {
                int a = width - e[i];
                if (a == n || a == n + 1 || a == n - 32 || a == n - 31) {
                    char num[3] = {(char) ('0' + n / 10), (char) ('0' + n % 10), '\0'};
                    canvas->drawString(n >= 10 ? num : &num[1], xPos, yPos - 5, p);
                    break;
                }
            }
            xPos += 20;
        }
        p.setColor(SK_ColorBLACK);
        for (int i = 0; i < count; ++i) {
            canvas->drawString(s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p);
        }
        p.setStyle(SkPaint::kStroke_Style);
        for (int i = 0; i <= count; ++i) {
            canvas->drawLine(5 + e[i] * 20, yPos, 5 + e[i] * 20, yPos + 15, p);
        }
        for (int i = 0; i < 2; ++i) {
            canvas->drawLine(5 + e[0] * 20, yPos + i * 15, 5 + e[count] * 20, yPos + i * 15, p);
        }
    };
    SkScalar edges[] = { 0, 8, 16, 24, 32 };
    const char* labels[] = { "alpha", "blue", "green", "red" };
    drawBoxText(edges, &labels[0], 4, 31, 45);
    drawBoxText(edges, &labels[3], 1, 7, 110);
    drawBoxText(edges, &labels[2], 1, 7, 160);
    drawBoxText(edges, &labels[1], 1, 7, 210);
    drawBoxText(edges, &labels[0], 1, 7, 260);
}
##
##

#Subtopic Image_Info_Color_Type_RGB_888
#Example
#Width 812
#Height 365
void draw(SkCanvas* canvas) {
    canvas->scale(1.25f, 1.25f);
    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setTextSize(10);
    paint.setTextAlign(SkPaint::kCenter_Align);
    canvas->drawString("32-bit word", 5 + 20 * 16, 20, paint);
    canvas->drawString("little endian byte order", 5 + 20 * 4, 85, paint);
    auto drawBoxText = [=](SkScalar e[], const char* s[], int count, int n, SkScalar yPos) -> void {
        SkPaint p(paint);
        p.setColor(SK_ColorRED);
        SkScalar xPos = 15;
        int width = n % 32 + 1;
        int lastN = n > 32 ? 32 : 0;
        for (; n >= lastN; --n) {
            for (int i = 0; i <= count; ++i) {
                int a = width - e[i];
                if (a == n || a == n + 1 || a == n - 32 || a == n - 31) {
                    char num[3] = {(char) ('0' + n / 10), (char) ('0' + n % 10), '\0'};
                    canvas->drawString(n >= 10 ? num : &num[1], xPos, yPos - 5, p);
                    break;
                }
            }
            xPos += 20;
        }
        p.setColor(SK_ColorBLACK);
        for (int i = 0; i < count; ++i) {
            canvas->drawString(s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p);
        }
        p.setStyle(SkPaint::kStroke_Style);
        for (int i = 0; i <= count; ++i) {
            canvas->drawLine(5 + e[i] * 20, yPos, 5 + e[i] * 20, yPos + 15, p);
        }
        for (int i = 0; i < 2; ++i) {
            canvas->drawLine(5 + e[0] * 20, yPos + i * 15, 5 + e[count] * 20, yPos + i * 15, p);
        }
    };
    SkScalar edges[] = { 0, 8, 16, 24, 32 };
    const char* labels[] = { "(unused)", "blue", "green", "red" };
    drawBoxText(edges, &labels[0], 4, 31, 45);
    drawBoxText(edges, &labels[3], 1, 7, 110);
    drawBoxText(edges, &labels[2], 1, 7, 160);
    drawBoxText(edges, &labels[1], 1, 7, 210);
    drawBoxText(edges, &labels[0], 1, 7, 260);
}
##
##

#Subtopic Image_Info_Color_Type_BGRA_8888
#Example
#Width 812
#Height 365
void draw(SkCanvas* canvas) {
    canvas->scale(1.25f, 1.25f);
    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setTextSize(10);
    paint.setTextAlign(SkPaint::kCenter_Align);
    canvas->drawString("32-bit word", 5 + 20 * 16, 20, paint);
    canvas->drawString("little endian byte order", 5 + 20 * 4, 85, paint);
    auto drawBoxText = [=](SkScalar e[], const char* s[], int count, int n, SkScalar yPos) -> void {
        SkPaint p(paint);
        p.setColor(SK_ColorRED);
        SkScalar xPos = 15;
        int width = n % 32 + 1;
        int lastN = n > 32 ? 32 : 0;
        for (; n >= lastN; --n) {
            for (int i = 0; i <= count; ++i) {
                int a = width - e[i];
                if (a == n || a == n + 1 || a == n - 32 || a == n - 31) {
                    char num[3] = {(char) ('0' + n / 10), (char) ('0' + n % 10), '\0'};
                    canvas->drawString(n >= 10 ? num : &num[1], xPos, yPos - 5, p);
                    break;
                }
            }
            xPos += 20;
        }
        p.setColor(SK_ColorBLACK);
        for (int i = 0; i < count; ++i) {
            canvas->drawString(s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p);
        }
        p.setStyle(SkPaint::kStroke_Style);
        for (int i = 0; i <= count; ++i) {
            canvas->drawLine(5 + e[i] * 20, yPos, 5 + e[i] * 20, yPos + 15, p);
        }
        for (int i = 0; i < 2; ++i) {
            canvas->drawLine(5 + e[0] * 20, yPos + i * 15, 5 + e[count] * 20, yPos + i * 15, p);
        }
    };
    SkScalar edges[] = { 0, 8, 16, 24, 32 };
    const char* labels[] = { "alpha", "red", "green", "blue" };
    drawBoxText(edges, &labels[0], 4, 31, 45);
    drawBoxText(edges, &labels[3], 1, 7, 110);
    drawBoxText(edges, &labels[2], 1, 7, 160);
    drawBoxText(edges, &labels[1], 1, 7, 210);
    drawBoxText(edges, &labels[0], 1, 7, 260);
}
##
##

#Subtopic Image_Info_Color_Type_RGBA_1010102
#Example
#Width 812
#Height 380
void draw(SkCanvas* canvas) {
    canvas->scale(1.25f, 1.25f);
    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setTextSize(10);
    paint.setTextAlign(SkPaint::kCenter_Align);
    canvas->drawString("32-bit word", 5 + 20 * 16, 20, paint);
    canvas->drawString("little endian byte order", 5 + 20 * 4, 85, paint);
    canvas->drawString("(low bits)", 5 + 20 * 4, 137, paint);
    canvas->drawString("(low bits)", 5 + 20 * 3, 187, paint);
    canvas->drawString("(high bits)", 5 + 20 * 7, 187, paint);
    canvas->drawString("(low bits)", 5 + 20 * 2, 237, paint);
    canvas->drawString("(high bits)", 5 + 20 * 6, 237, paint);
    canvas->drawString("(high bits)", 5 + 20 * 5, 287, paint);
    auto drawBoxText = [=](SkScalar e[], const char* s[], int count, int n, SkScalar yPos) -> void {
        SkPaint p(paint);
        p.setColor(SK_ColorRED);
        SkScalar xPos = 15;
        int width = n % 32 + 1;
        int lastN = n > 32 ? 32 : 0;
        for (; n >= lastN; --n) {
            for (int i = 0; i <= count; ++i) {
                int a = width - e[i];
                if (a == n || a == n + 1 || a == n - 32 || a == n - 31) {
                    char num[3] = {(char) ('0' + n / 10), (char) ('0' + n % 10), '\0'};
                    canvas->drawString(n >= 10 ? num : &num[1], xPos, yPos - 5, p);
                    break;
                }
            }
            xPos += 20;
        }
        p.setColor(SK_ColorBLACK);
        for (int i = 0; i < count; ++i) {
            canvas->drawString(s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p);
        }
        p.setStyle(SkPaint::kStroke_Style);
        for (int i = 0; i <= count; ++i) {
            canvas->drawLine(5 + e[i] * 20, yPos, 5 + e[i] * 20, yPos + 15, p);
        }
        for (int i = 0; i < 2; ++i) {
            canvas->drawLine(5 + e[0] * 20, yPos + i * 15, 5 + e[count] * 20, yPos + i * 15, p);
        }
    };
    SkScalar edges[] = { 0, 2, 12, 22, 32,
                         0, 8,
                         0, 6, 8,
                         0, 4, 8,
                         0, 2, 8
                        };
    const char* labels[] = { "alpha", "blue", "green", "red" };
    drawBoxText(&edges[0], &labels[0], 4, 31, 45);
    drawBoxText(&edges[5], &labels[3], 1, 7, 110);
    drawBoxText(&edges[7], &labels[2], 2, 7, 160);
    drawBoxText(&edges[10], &labels[1], 2, 7, 210);
    drawBoxText(&edges[13], &labels[0], 2, 7, 260);
}
##
##

#Subtopic Image_Info_Color_Type_RGB_101010
#Example
#Width 812
#Height 380
void draw(SkCanvas* canvas) {
    canvas->scale(1.25f, 1.25f);
    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setTextSize(10);
    paint.setTextAlign(SkPaint::kCenter_Align);
    canvas->drawString("32-bit word", 5 + 20 * 16, 20, paint);
    canvas->drawString("little endian byte order", 5 + 20 * 4, 85, paint);
    canvas->drawString("(low bits)", 5 + 20 * 4, 137, paint);
    canvas->drawString("(low bits)", 5 + 20 * 3, 187, paint);
    canvas->drawString("(high bits)", 5 + 20 * 7, 187, paint);
    canvas->drawString("(low bits)", 5 + 20 * 2, 237, paint);
    canvas->drawString("(high bits)", 5 + 20 * 6, 237, paint);
    canvas->drawString("(high bits)", 5 + 20 * 5, 287, paint);
    auto drawBoxText = [=](SkScalar e[], const char* s[], int count, int n, SkScalar yPos) -> void {
        SkPaint p(paint);
        p.setColor(SK_ColorRED);
        SkScalar xPos = 15;
        int width = n % 32 + 1;
        int lastN = n > 32 ? 32 : 0;
        for (; n >= lastN; --n) {
            for (int i = 0; i <= count; ++i) {
                int a = width - e[i];
                if (a == n || a == n + 1 || a == n - 32 || a == n - 31) {
                    char num[3] = {(char) ('0' + n / 10), (char) ('0' + n % 10), '\0'};
                    canvas->drawString(n >= 10 ? num : &num[1], xPos, yPos - 5, p);
                    break;
                }
            }
            xPos += 20;
        }
        p.setColor(SK_ColorBLACK);
        for (int i = 0; i < count; ++i) {
            canvas->drawString(s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p);
        }
        p.setStyle(SkPaint::kStroke_Style);
        for (int i = 0; i <= count; ++i) {
            canvas->drawLine(5 + e[i] * 20, yPos, 5 + e[i] * 20, yPos + 15, p);
        }
        for (int i = 0; i < 2; ++i) {
            canvas->drawLine(5 + e[0] * 20, yPos + i * 15, 5 + e[count] * 20, yPos + i * 15, p);
        }
    };
    SkScalar edges[] = { 0, 2, 12, 22, 32,
                         0, 8,
                         0, 6, 8,
                         0, 4, 8,
                         0, 2, 8
                        };
    const char* labels[] = { "unused", "blue", "green", "red" };
    drawBoxText(&edges[0], &labels[0], 4, 31, 45);
    drawBoxText(&edges[5], &labels[3], 1, 7, 110);
    drawBoxText(&edges[7], &labels[2], 2, 7, 160);
    drawBoxText(&edges[10], &labels[1], 2, 7, 210);
    drawBoxText(&edges[13], &labels[0], 2, 7, 260);
}
##
##

#Subtopic Image_Info_Color_Type_RGBA_F16
#Example
#Width 812
#Height 685
void draw(SkCanvas* canvas) {
    canvas->scale(1.25f, 1.25f);
    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setTextSize(10);
    paint.setTextAlign(SkPaint::kCenter_Align);
    canvas->drawString("64-bit word", 5 + 20 * 16, 20, paint);
    canvas->drawString("little endian byte order", 5 + 20 * 4, 135, paint);
    for (int i = 0; i < 4; ++i) {
        canvas->drawString("(low bits)", 5 + 20 * 4, 187 + i * 100, paint);
        canvas->drawString("(high bits)", 5 + 20 * 4, 237 + i * 100, paint);
    }
    auto drawBoxText = [=](SkScalar e[], const char* s[], int count, int n, SkScalar yPos) -> void {
        SkPaint p(paint);
        p.setColor(SK_ColorRED);
        SkScalar xPos = 15;
        int width = n % 32 + 1;
        int lastN = n > 32 ? 32 : 0;
        for (; n >= lastN; --n) {
            for (int i = 0; i <= count; ++i) {
                int a = width - e[i];
                if (a == n || a == n + 1 || a == n - 32 || a == n - 31) {
                    char num[3] = {(char) ('0' + n / 10), (char) ('0' + n % 10), '\0'};
                    canvas->drawString(n >= 10 ? num : &num[1], xPos, yPos - 5, p);
                    break;
                }
            }
            xPos += 20;
        }
        p.setColor(SK_ColorBLACK);
        for (int i = 0; i < count; ++i) {
            canvas->drawString(s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p);
        }
        p.setStyle(SkPaint::kStroke_Style);
        for (int i = 0; i <= count; ++i) {
            canvas->drawLine(5 + e[i] * 20, yPos, 5 + e[i] * 20, yPos + 15, p);
        }
        for (int i = 0; i < 2; ++i) {
            canvas->drawLine(5 + e[0] * 20, yPos + i * 15, 5 + e[count] * 20, yPos + i * 15, p);
        }
    };
    SkScalar edges[] = { 0, 16, 32,
                         0, 8
                       };
    const char* labels[] = { "alpha", "blue", "green", "red" };
    drawBoxText(&edges[0], &labels[0], 2, 63, 45);
    drawBoxText(&edges[0], &labels[2], 2, 31, 95);
    drawBoxText(&edges[3], &labels[3], 1, 7, 160);
    drawBoxText(&edges[3], &labels[3], 1, 7, 210);
    drawBoxText(&edges[3], &labels[2], 1, 7, 260);
    drawBoxText(&edges[3], &labels[2], 1, 7, 310);
    drawBoxText(&edges[3], &labels[1], 1, 7, 360);
    drawBoxText(&edges[3], &labels[1], 1, 7, 410);
    drawBoxText(&edges[3], &labels[0], 1, 7, 460);
    drawBoxText(&edges[3], &labels[0], 1, 7, 510);
}
##
##

#Topic Illustrations ##